Three-dimensional space management and control method for construction projects near river channel

Abstract

A three-dimensional space management and control method for construction projects near a riverway relates to the field of three-dimensional space management and control of riverway construction projects, and is characterized by comprising the following steps: data coding, three-dimensional scene construction, riverway regulation database construction, riverway location analysis, building height box analysis, sectioning analysis, visual corridor analysis and result output. The method has the advantages that the method of the three-dimensional geographic information technology is applied to the field of protecting the ecological environment near the riverway for construction project examination for the first time, the method is high in intelligent degree, high in data and calculation value precision and high in result accuracy, suitability and legality of a construction project scheme can be visually and scientifically analyzed, and the method is suitable for popularization and application. The influence on the ecological environment around the riverway is reduced; according to the method, the manual manufacturing cost is reduced, the construction project review period is shortened, the construction project review efficiency is improved, and the method has remarkable social benefits and very high popularization value.

Description

Technical Field

[0001] The present invention relates to the field of three-dimensional space control of river channel construction projects, and in particular to a three-dimensional space control method for three-dimensional river channel construction projects, which uses three-dimensional geographic information technology and virtual reality technology to quickly build a project design plan and a three-dimensional scene of a river channel and its surroundings, accurately express the spatial location, size, distance, shape, and color of buildings and structures, and analyze and determine whether the design plan of the construction project meets the conditions of river channel protection planning regulations. Background Art

[0002] Today, with the rapid development of 3D virtual reality technology and geographic information technology, there is no corresponding 3D spatial control and management spatial analysis software for river protection for the 3D spatial analysis of the suitability of the schemes involved in the construction projects near the river area. The original review forms are different, the content is simple, the information is not comprehensive, and the efficiency of planning approval is not high. In order to further standardize the approval method of construction projects near the river area, improve the scientific nature of planning management and improve the efficiency of planning administrative approval, a 3D spatial control method for construction projects near the river is developed, combined with the land space control details of the core monitoring area of ​​the Tianjin section of the river, and a supporting 3D spatial analysis software for river construction projects is developed to assist users in determining whether the planning and implementation of construction projects meet the requirements of river protection planning regulations. Summary of the invention

[0003] The embodiment of the present invention provides a three-dimensional space control method for construction projects near rivers. The method of the present invention can comprehensively analyze the suitability of architectural space position, size, skyline, height, facade color, and spatial form of design schemes for construction projects near river areas in three-dimensional space, intelligently analyze and compare whether design indicators of design schemes meet the requirements of river protection regulations, determine the spatial positions and indicator contents that do not meet the requirements of the regulations, and finally automatically generate a three-dimensional space analysis report album document for river construction projects.

[0004] The present invention provides a three-dimensional space control method for a construction project near a river, wherein the method comprises the following steps:

[0005] Data coding: Code and classify the project space data, surrounding space data, river space data, and river protection regulations required for the construction project, and organize them into various types of original data;

[0006] 3D scene construction: extract the original data after coding, and make a 3D space control and analysis model for the river construction project in accordance with the requirements of river protection regulations. Name and code each 3D model object to finally form a 3D space analysis scene for the river construction project.

[0007] River regulations database construction: extract the original data after coding, extract the relevant laws and regulations and indicator data of river protection planning, and build a river law and regulation resource database;

[0008] River location analysis: Extract the coded construction project and river 3D model data, conduct spatial location analysis of the construction project, identify the location relationship between the construction project and the river, determine the location of the construction project according to the regional location conditions stipulated in the river area protection regulations, automatically analyze and generate a regional overlap analysis table, automatically identify the distance between the construction project and the surrounding key buildings, and mark the distance, identify the top view range and output the location analysis map;

[0009] Building height box analysis: extract the original data after encoding, identify the buildings to be analyzed in the three-dimensional scene, identify the river bank, extract the river protection law indicator data, simulate and construct the building height limit box, obtain the buildings that exceed the height required by the law through superposition analysis, extract the building height information and building area information, generate the analysis result table, plot the building height value and highlight the super-high height value. At the same time, extract the construction project and surrounding buildings, calculate the average height according to the area range, generate the average height box of the area range, and plot the height, and finally output the corridor analysis diagram, the view occlusion analysis diagram and the bird's-eye view analysis diagram;

[0010] Section analysis: extract the encoded raw data, identify the buildings to be analyzed in the 3D scene, identify the river bank, identify the section plane, calculate the distance scale between the buildings on the section plane and the river bank and partition line, including the spacing, width, and height information, and plot the calculation result values ​​and the angle lines required by regulations in the 3D window, identify the viewpoint position and direction of the section plane, and finally generate a section analysis diagram;

[0011] Visual corridor analysis: extract the encoded raw data, identify the scope of the construction project in the three-dimensional scene, identify the location of the surrounding key buildings, and conduct corridor analysis between the construction project relative to the viewpoint and the key buildings according to the input viewpoint position, conduct visual occlusion analysis on the construction project with respect to the viewpoint position, and plot the relevant information, and finally output the corridor analysis diagram, visual occlusion analysis diagram and bird's-eye view analysis diagram;

[0012] Result output: The result graphs, tables, and texts obtained from the analysis in the above steps shall be compiled into documents in accordance with regulatory requirements to form a results report.

[0013] A three-dimensional space control method for a construction project near a river, wherein the three-dimensional scene construction steps specifically include: three-dimensional model construction of the river and surrounding buildings, three-dimensional model construction of the construction project, and three-dimensional scene integration; wherein:

[0014] Construction of 3D model of the river channel and surrounding structures: Extracting the original data of the river channel and surrounding ground data, and constructing the complete 3D model of the ground structures and geographical elements;

[0015] Construction of 3D models of construction projects: extracting original data of design drawings and renderings of construction projects, and constructing detailed 3D models of buildings and landscapes of construction projects;

[0016] 3D scene integration: Integrate the 3D ground model data around the river and the 3D model data of the construction project into a unified standard and coordinate system to form a 3D management and analysis scene for the river construction project.

[0017] A three-dimensional spatial control method for construction projects near a river, wherein the steps of constructing a river regulations database are specifically: river regulations classification, control index extraction, and river regulations database construction; wherein:

[0018] River regulations classification: extract the original data of regulations related to river construction project protection, and classify them by indicators, grades and types;

[0019] Extraction of control indicators: Extract river protection indicator limit data and establish indicator requirement data table;

[0020] River regulations database construction: Extract the results of the first two steps and establish a relational river regulations database.

[0021] A three-dimensional space control method for a construction project near a river, wherein the river location analysis steps are specifically: building identification, location calculation, and location analysis map output; wherein:

[0022] Building recognition: Extract the original data of the 3D scene, select the building data of the construction project and the surrounding key buildings according to the building data feature value information of the construction project and the surrounding key buildings, and perform building coding for the construction project;

[0023] Location calculation: Based on the identified characteristic information of the construction project building and the river protection line information, the location information of the construction project is obtained after superposition, and the mapping relationship between the building and the location is established and stored in the database table;

[0024] Location analysis map output: extract multiple location analysis mapping relationship data respectively, mark the distance between the building and the river, the area where the building is located, the distance between the building and the surrounding key buildings in the three-dimensional scene, mark the building name, key building name, important community name, surrounding project name and road name, identify the viewpoint orientation of the river panoramic project point map and the project panoramic map, adjust the viewpoint orientation in the three-dimensional scene, and output the map with large resolution and specifications to form the final location analysis results map.

[0025] A three-dimensional space control method for a construction project near a river, wherein the three-dimensional sectioning analysis steps are specifically: project identification, building identification, river bank identification, section line identification, scale calculation, and section analysis diagram output; wherein:

[0026] Building recognition: extract the original data of the 3D scene, select the building data according to the characteristic value information of the building data, and perform building coding;

[0027] Riverbank identification: Extract river data and riverbank data from the three-dimensional scene and encode the riverbank.

[0028] Section line recognition: extract the section line segments to be analyzed in the 3D scene and encode the section lines.

[0029] Scale calculation: According to the azimuth section of the cutting line, the river width, the distance from the building to the river bank, and the width of each section are calculated respectively;

[0030] Output of section analysis drawings: mark the building height, width distance, and cross-sectional distance in the three-dimensional scene, draw the river angle analysis line and mark it carefully, adjust the angle and direction of the viewpoint according to the section analysis line, highlight the buildings that do not comply with regulations, and finally output the section analysis drawings corresponding to each section line.

[0031] A three-dimensional space control method for a construction project near a river, wherein the specific steps of building identification are:

[0032] Building feature input: Extract the original building feature data, including the feature codes of the building and surrounding building data of the construction project, and establish a mapping relationship between various types of buildings and feature codes.

[0033] Building coding: Based on the mapping relationship between the established building and feature code, a 3D building coding index is established, including the construction project building and its surrounding and key buildings, for quick pickup of 3D building data.

[0034] A three-dimensional space control method for a construction project near a river, wherein the specific steps of the building location analysis are:

[0035] Building location calculation: extract original orthophoto data, urban built-up area data, historical urban area data, core monitoring area data, riverside ecological space data, protection area data, world cultural heritage buffer area data, ecological protection red line data, river management area data, construction project scope data, and quickly identify and obtain the three-dimensional building model of the construction project according to the building code of the construction project. Through spatial position superposition, the location of the construction project is obtained, which involves position superposition analysis and calculation of location disclosure, and sequentially calculates the position relationship between the construction project and the scope of each protection area;

[0036] It is known that the construction project scope extracted is assumed to be a polygon P, and each vertex of the polygon is P i (x i ,y i ,z i ), each protected area is assumed to be a polygon Q, that is, it is necessary to calculate the solution E(P,Q) to determine the positional relationship between the two polygons, that is, to obtain the location of the construction project;

[0037]

[0038] Where: E(P,Q) represents the positional relationship between polygons P and Q, P i (x i ,y i ,z i ) is a vertex of polygon P and its three-dimensional spatial coordinate values, i = 0, 1, 2, 3, ... represents its vertex number, 0 represents a separation relationship, 1 represents an intersection relationship, P i in Q means that a vertex of polygon P is within the range of polygon Q. i Out ofQ means that every vertex of polygon P is not within the range of polygon Q;

[0039] A three-dimensional space control method for a construction project near a river, wherein the specific steps of outputting the location analysis map are:

[0040] Relationship distance mapping: extract the surrounding key building codes, identify the key building 3D models, and the construction project building 3D models, draw the shortest distance marking line between the two, and mark the distance length value in yellow. The construction control zone line is cyan, the project land is red, the river management range line is light blue, the protection site point is orange, the heritage area boundary line is pink, and the river management range is blue;

[0041] Building location mapping: In the small-scale panoramic location analysis map, the location of the construction project is marked with a large red circle point. In the large-scale location analysis map, the construction project scope line is circled with a polygon and the color value is red.

[0042] Location analysis map output: Through the construction project location and map size, the 3D scene camera position and orientation are identified according to the scale, and small-scale and large-scale building location analysis screenshots are obtained respectively, and finally output into high-definition resolution images.

[0043] A three-dimensional space control method for a construction project near a river, wherein the specific steps of river bank identification are:

[0044] Riverbank feature input: extract river channel 3D model data and input river channel features;

[0045] Riverbank feature coding: Based on the riverbank feature input, the riverbed model and riverbank model of the three-dimensional river are coded;

[0046] A three-dimensional space control method for a construction project near a river, wherein the specific steps of the scale calculation are:

[0047] River width calculation: According to the riverbank code, extract the basic data of the riverbanks on both sides of the river and the boundary lines of each protection zone, use the input cutting line as the cutting section, obtain the cross-sectional width of the river at the section and the distance from each protection line to the riverbank on the same side, and establish a mapping to store the distance value.

[0048] Calculation of distance between buildings and rivers: Extract the construction project buildings and surrounding key buildings, use the input cutting line as the cutting section, obtain the shortest distance between the building and the riverbank on the same side at the section, and establish a mapping to store the distance value.

[0049] Slope calculation: extract the riverbank on the opposite side of the construction project, take the input cutting line as the cutting section, take the horizontal direction as the 0 degree direction, take the elevation angle α=18° and the distance height ratio δ=1 / 3, δ=1 / 4 as the height limit threshold, and obtain the height limit slope value. The specific calculation method is the same as the height limit box calculation formula.

[0050] A three-dimensional space control method for a construction project near a river, wherein the specific steps of outputting the cut analysis diagram are:

[0051] Analysis result plotting: According to the direction of the cutting line, extract the distance value mapping of the river width calculation, building river spacing calculation and slope calculation steps on both sides of the cutting line, and perform distance plotting and drawing of distance values ​​and angle values.

[0052] Camera orientation recognition: Based on the position of the cutting surface, the scope of the construction project and the river channel, with the construction project and the river channel as the center, the best viewing angle camera position and orientation of the cross sections on both sides are identified respectively, and then the three-dimensional scene on one side of the cutting surface about the viewpoint position is cut out through the three-dimensional scene cutting method to ensure the beauty of the interface diagram.

[0053] Output of section analysis diagram: extract the recognized camera position, perform viewpoint camera positioning respectively, display the 3D scene and plotting results of the current position respectively, and output the section analysis result diagram with high-definition resolution respectively.

[0054] A three-dimensional space control method for a construction project near a river, wherein the specific steps of identifying key buildings are:

[0055] Input of surrounding key element features: Extract key building elements around the river construction project, input corresponding element features, and establish mapping relationships;

[0056] Feature coding of surrounding key elements: Feature coding of key elements surrounding the established construction project is used to quickly retrieve and pick up surrounding key elements.

[0057] A three-dimensional space control method for construction projects near rivers, wherein the three-dimensional models of surrounding structures include: a three-dimensional model of the river, ground structures around the construction project, basic supporting facilities, urban landscape, urban roads, traffic signs, street lights, green plants, urban components, and other water systems; the three-dimensional model of the construction project includes: construction project structures, construction project landscape, security, supporting facilities, garages, and parking spaces; the content of the location analysis map includes: a panoramic map of the construction project location and a bird's-eye view location map of the construction project, wherein the main content of the panoramic location map of the construction project is based on aerial images, superimposed with a river vector map, an administrative division vector map, an urban building urban area vector map, a historical urban area vector map, a core monitoring area vector map, a riverside ecological space vector map, a protection range vector map, a world cultural heritage buffer zone vector map, an ecological protection red line vector map, and a river management range vector map, and the description part includes a legal basis description map, a legend, a project location thumbnail, a construction project introduction, and a map name. The main content of the bird's-eye view location map of the construction project takes the three-dimensional digital city model as the base map, and overlays the three-dimensional scene model of the river, the three-dimensional scene model of the construction project plan, the three-dimensional scene model of the surrounding status, the three-dimensional model of the project land use scope, the three-dimensional model of the river management scope, the three-dimensional model of the heritage buffer zone, the three-dimensional model of the construction control zone line, the three-dimensional model of the riverside ecological space and the three-dimensional model of the cultural relics location. The explanatory part includes the eagle-eye map of the construction project, the legend, the analysis conclusion and the map name; the main content of the section analysis map takes the three-dimensional digital city model as the background, takes the close-up viewpoints on both sides of the section, and overlays the section analysis angle threshold vector map and the distance annotation vector map. The explanatory part includes the eagle-eye map of the construction project, the analysis conclusion and the map name.

[0058] Advantages of the present invention:

[0059] The present invention provides a three-dimensional spatial control method for construction projects near rivers. For the first time, a three-dimensional geographic information technology method is used to review construction projects in the field of protecting the ecological environment near rivers. The method has a high degree of intelligence, high precision in data and calculation values, and a high accuracy rate in results. It can intuitively and scientifically analyze the suitability and legality of construction project plans and their impact on the ecological environment around rivers. The method reduces labor costs, shortens the review period for construction projects, and improves the review efficiency for construction projects. It has significant social benefits and high promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1A schematic diagram of the overall process of a three-dimensional space control method for a construction project near a river provided by an embodiment of the present invention;

[0061] Figure 2 A schematic flow chart of a three-dimensional scene construction step in a three-dimensional space control method for a construction project near a river provided by an embodiment of the present invention;

[0062] Figure 3 A schematic flow chart of the steps of constructing a river protection regulations database in a three-dimensional space control method for a construction project near a river provided by an embodiment of the present invention;

[0063] Figure 4 A schematic flow chart of a construction project location analysis step in a three-dimensional space control method for a construction project near a river provided by an embodiment of the present invention;

[0064] Figure 5 A schematic flow chart of a three-dimensional scene sectioning and analysis step in a three-dimensional space control method for a construction project near a river provided by an embodiment of the present invention;

[0065] Figure 6 A schematic flow chart of a building identification step in a three-dimensional space control method for a construction project near a river provided in an embodiment of the present invention.

[0066] Figure 7 A schematic flow chart of a construction project building location analysis step in a three-dimensional space control method for a construction project near a river provided in an embodiment of the present invention.

[0067] Figure 8 A schematic flow chart of the steps of outputting a river location analysis map in a three-dimensional space control method for a construction project near a river provided in an embodiment of the present invention.

[0068] Fig. 9 A schematic flow chart of a river channel and riverbank identification step in a three-dimensional space management and control method for a construction project near a river provided in an embodiment of the present invention.

[0069] Fig.10 A schematic flow chart of a river channel scale calculation step in a three-dimensional space control method for a construction project near a river provided in an embodiment of the present invention.

[0070] Fig.11 A schematic flow chart of the step of outputting a section analysis diagram in a three-dimensional space control method for a construction project near a river provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0071] In order to enable those skilled in the art to better understand the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0072] Embodiment 1:

[0073] Figure 1 The figure is a schematic diagram of the overall process of a three-dimensional space control method for a construction project near a river. Figure 1 As shown, the method comprises the following steps:

[0074] Data coding: Code and classify the project space data, surrounding space data, river space data, and river protection regulations required for the construction project, and organize them into various types of original data;

[0075] 3D scene construction: extract the original data after coding, and make a 3D space control and analysis model for the river construction project in accordance with the requirements of river protection regulations. Name and code each 3D model object to finally form a 3D space analysis scene for the river construction project.

[0076] River regulations database construction: extract the original data after coding, extract the relevant laws and regulations and indicator data of river protection planning, and build a river law and regulation resource database;

[0077] River location analysis: Extract the coded construction project and river 3D model data, conduct spatial location analysis of the construction project, identify the location relationship between the construction project and the river, determine the location of the construction project according to the regional location conditions stipulated in the river area protection regulations, automatically analyze and generate a regional overlap analysis table, automatically identify the distance between the construction project and the surrounding key buildings, and mark the distance, identify the top view range and output the location analysis map;

[0078] Building height box analysis: extract the encoded raw data, identify the buildings to be analyzed in the three-dimensional scene, identify the river bank, extract the river protection regulations and indicators, simulate and construct the building height limit box, obtain the buildings that exceed the height required by the regulations through superposition analysis, extract the building height information and building area information, generate the analysis result table, plot the building height value and highlight the super-high height value. At the same time, extract the construction project and surrounding buildings, calculate the average height according to the area range, generate the average height box of the area range, and plot the height, and finally output the height limit box analysis diagram and the average height box analysis diagram;

[0079] Section analysis: extract the encoded raw data, identify the buildings to be analyzed in the 3D scene, identify the river bank, identify the section plane, calculate the distance scale between the buildings on the section plane and the river bank and partition line, including the spacing, width, and height information, and plot the calculation result values ​​and the angle lines required by regulations in the 3D window, identify the viewpoint position and direction of the section plane, and finally generate a section analysis diagram;

[0080] Visual corridor analysis: extract the encoded raw data, identify the scope of the construction project in the three-dimensional scene, identify the location of the surrounding key buildings, and conduct corridor analysis between the construction project relative to the viewpoint and the key buildings according to the input viewpoint position, conduct visual occlusion analysis on the construction project with respect to the viewpoint position, and plot the relevant information, and finally output the corridor analysis diagram, visual occlusion analysis diagram and bird's-eye view analysis diagram;

[0081] Result output: The result graphs, tables, and texts obtained from the analysis in the above steps shall be compiled into documents according to the requirements of laws and regulations to form a report on the results. Result output: The result graphs, tables, and texts obtained from the analysis in the above steps shall be compiled into documents according to the requirements of laws and regulations to form a report on the results.

[0082] like Figure 2 A three-dimensional space control method for a construction project near a river is shown, wherein the three-dimensional scene construction steps are specifically: three-dimensional model construction of the river and surrounding buildings, three-dimensional model construction of the construction project, and three-dimensional scene integration; wherein:

[0083] Construction of 3D model of the river channel and surrounding structures: Extracting the original data of the river channel and surrounding ground data, and constructing the complete 3D model of the ground structures and geographical elements;

[0084] Construction of 3D models of construction projects: Extracting original data of design drawings and renderings of construction projects, and constructing detailed 3D models of buildings and landscapes of construction projects;

[0085] 3D scene integration: Integrate the 3D ground model data around the river and the 3D model data of the construction project into a unified standard and coordinate system to form a 3D management and analysis scene for the river construction project.

[0086] like Figure 3 A three-dimensional spatial control method for a construction project near a river is shown, wherein the steps of constructing a river regulations database are specifically: river regulations classification, control index extraction, and river regulations database construction; wherein:

[0087] River regulations classification: extract the original data of regulations related to river construction project protection, and classify them by indicators, grades and types;

[0088] Extraction of control indicators: Extract river protection indicator limit data and establish indicator requirement data table;

[0089] River regulations database construction: Extract the results of the first two steps and establish a relational river regulations database.

[0090] like Figure 4 A three-dimensional space control method for a construction project near a river is shown, wherein the river location analysis steps are specifically: building identification, location calculation, and location analysis map output; wherein:

[0091] Building recognition: Extract the original data of the 3D scene, select the building data of the construction project and the surrounding key buildings according to the building data feature value information of the construction project and the surrounding key buildings, and perform building coding for the construction project;

[0092] Location calculation: Based on the identified characteristic information of the construction project building and the river protection line information, the location information of the construction project is obtained after superposition, and the mapping relationship between the building and the location is established and stored in the database table;

[0093] Location analysis map output: extract multiple location analysis mapping relationship data respectively, mark the distance between the building and the river, the area where the building is located, the distance between the building and the surrounding key buildings in the three-dimensional scene, mark the building name, key building name, important community name, surrounding project name and road name, identify the viewpoint orientation of the river panoramic project point map and the project panoramic map, adjust the viewpoint orientation in the three-dimensional scene, and output the map with large resolution and specifications to form the final location analysis results map.

[0094] like Figure 5 A three-dimensional space control method for a construction project near a river is shown, wherein the three-dimensional sectioning analysis steps are specifically: project identification, building identification, river bank identification, section line identification, scale calculation, and section analysis diagram output; wherein:

[0095] Building recognition: extract the original data of the 3D scene, select the building data according to the characteristic value information of the building data, and perform building coding;

[0096] Riverbank identification: Extract river data and riverbank data from the three-dimensional scene and encode the riverbank.

[0097] Section line recognition: extract the section line segments to be analyzed in the 3D scene and encode the section lines.

[0098] Scale calculation: According to the azimuth section of the cutting line, the river width, the distance from the building to the river bank, and the width of each section are calculated respectively;

[0099] Output of section analysis drawings: mark the building height, width distance, and cross-sectional distance in the three-dimensional scene, draw the river angle analysis line and mark it carefully, adjust the angle and direction of the viewpoint according to the section analysis line, highlight the buildings that do not comply with regulations, and finally output the section analysis drawings corresponding to each section line.

[0100] like Figure 6 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of building identification are:

[0101] Building feature input: Extract the original building feature data, including the feature codes of the building and surrounding building data of the construction project, and establish a mapping relationship between various types of buildings and feature codes.

[0102] Building coding: Based on the mapping relationship between the established building and feature code, a 3D building coding index is established, including the construction project building and its surrounding and key buildings, for quick pickup of 3D building data.

[0103] like Figure 7 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of the building location analysis are:

[0104] Building location calculation: extract original orthophoto data, urban built-up area data, historical urban area data, core monitoring area data, riverside ecological space data, protection area data, world cultural heritage buffer area data, ecological protection red line data, river management area data, construction project scope data, and quickly identify and obtain the three-dimensional building model of the construction project according to the building code of the construction project. Through spatial position superposition, the location of the construction project is obtained, which involves position superposition analysis and calculation of location disclosure, and sequentially calculates the position relationship between the construction project and the scope of each protection area;

[0105] It is known that the extracted construction project range is assumed to be a polygon P, and each vertex of the polygon is P i (x i ,y i ,z i ), each protected area is assumed to be a polygon Q, that is, it is necessary to calculate the solution E(P,Q) to determine the positional relationship between the two polygons, that is, to obtain the location of the construction project;

[0106]

[0107] Where: E(P,Q) represents the positional relationship between polygons P and Q, P i (x i ,y i ,z i) is a vertex of polygon P and its three-dimensional spatial coordinate values, i = 0, 1, 2, 3, ... represents its vertex number, 0 represents a separation relationship, 1 represents an intersection relationship, P i in Q means that a vertex of polygon P is within the range of polygon Q. i Out ofQ means that every vertex of polygon P is not within the range of polygon Q;

[0108] like Figure 8 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of outputting the location analysis map are:

[0109] Relationship distance mapping: extract the surrounding key building codes, identify the key building 3D models, and the construction project building 3D models, draw the shortest distance marking line between the two, and mark the distance length value in yellow. The construction control zone line is cyan, the project land is red, the river management range line is light blue, the protection site point is orange, the heritage area boundary line is pink, and the river management range is blue;

[0110] Building location mapping: In the small-scale panoramic location analysis map, the location of the construction project is marked with a large red circle point. In the large-scale location analysis map, the construction project scope line is circled with a polygon and the color value is red.

[0111] Location analysis map output: Through the construction project location and map size, the 3D scene camera position and orientation are identified according to the scale, and small-scale and large-scale building location analysis screenshots are obtained respectively, and finally output into high-definition resolution images.

[0112] like Fig. 9 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of river bank identification are:

[0113] Riverbank feature input: extract river channel 3D model data and input river channel features;

[0114] Riverbank feature coding: Based on the riverbank feature input, the riverbed model and riverbank model of the three-dimensional river are coded;

[0115] like Fig.10 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of the scale calculation are:

[0116] River width calculation: According to the riverbank code, extract the basic data of the riverbanks on both sides of the river and the boundary lines of each protection zone, use the input cutting line as the cutting section, obtain the cross-sectional width of the river at the section and the distance from each protection line to the riverbank on the same side, and establish a mapping to store the distance value.

[0117] Calculation of distance between buildings and rivers: Extract the construction project buildings and surrounding key buildings, use the input cutting line as the cutting section, obtain the shortest distance between the building and the riverbank on the same side at the section, and establish a mapping to store the distance value.

[0118] Slope calculation: extract the riverbank on the opposite side of the construction project, take the input cutting line as the cutting section, take the horizontal direction as the 0 degree direction, take the elevation angle α=18° and the distance height ratio δ=1 / 3, δ=1 / 4 as the height limit threshold, and obtain the height limit slope value. The specific calculation method is the same as the height limit box calculation formula.

[0119] like Fig.11 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of outputting the cut analysis diagram are:

[0120] Analysis result plotting: According to the direction of the cutting line, extract the distance value mapping of the river width calculation, building river spacing calculation and slope calculation steps on both sides of the cutting line, and perform distance plotting and drawing of distance values ​​and angle values.

[0121] Camera orientation recognition: Based on the position of the cutting surface, the scope of the construction project and the river channel, with the construction project and the river channel as the center, the best viewing angle camera position and orientation of the cross sections on both sides are identified respectively, and then the three-dimensional scene on one side of the cutting surface about the viewpoint position is cut out through the three-dimensional scene cutting method to ensure the beauty of the interface diagram.

[0122] Output of section analysis diagram: extract the recognized camera position, perform viewpoint camera positioning respectively, display the 3D scene and plotting results of the current position respectively, and output the section analysis result diagram with high-definition resolution respectively.

[0123] In the specific implementation case: the three-dimensional model of the surrounding buildings and structures includes: three-dimensional model of the river channel, ground buildings and structures around the construction project, basic supporting facilities, urban landscape, urban roads, traffic signs, street lights, green plants, urban components, and other water systems; the three-dimensional model of the construction project includes: construction project buildings and structures, construction project landscape, security, supporting facilities, garages, and parking spaces; the contents of the location analysis map include: panoramic map of the construction project location and bird's-eye view location map of the construction project, among which the main content of the panoramic location map of the construction project is based on aerial images, superimposed with river vector maps, administrative division vector maps, urban building urban area vector maps, historical urban area vector maps, core monitoring area vector maps, riverside ecological space vector maps, protection area vector maps, world cultural heritage buffer zone vector maps, ecological protection red line vector maps, and river management area vector maps; the description part includes legal basis description maps, legends, project location thumbnails, construction project introductions, and map names. The main content of the bird's-eye view location map of the construction project takes the three-dimensional digital city model as the base map, and overlays the three-dimensional scene model of the river, the three-dimensional scene model of the construction project plan, the three-dimensional scene model of the surrounding status, the three-dimensional model of the project land use scope, the three-dimensional model of the river management scope, the three-dimensional model of the heritage buffer zone, the three-dimensional model of the construction control zone line, the three-dimensional model of the riverside ecological space and the three-dimensional model of the cultural relics location. The explanatory part includes the eagle-eye map of the construction project, the legend, the analysis conclusion and the map name; the main content of the section analysis map takes the three-dimensional digital city model as the background, takes the close-up viewpoints on both sides of the section, and overlays the section analysis angle threshold vector map and the distance annotation vector map. The explanatory part includes the eagle-eye map of the construction project, the analysis conclusion and the map name.

[0124] Embodiment 2:

[0125] Figure 1 The figure is a schematic diagram of the overall process of a three-dimensional space control method for a construction project near a river. Figure 1 As shown, the method comprises the following steps:

[0126] Data coding: Encode and classify the spatial data, building feature attribute data, and river protection planning and regulations required for the project and surrounding ground structures, and organize various types of original data. Spatial data includes: ground three-dimensional point cloud data coding YH-DY-DS-00001.las, ground image data coding YH-YX-DS-00001.jpg, ground house vector data coding YH-FW-DS-00001.shp, river connection vector data coding YH-DYH-DS-00001.shp, river protection planning range vector data coding YH-BHGHFW-DS-00001.shp, ground topographic map data coding YH-DX-DS-00001.dwg, project construction drawing data coding YH-XM-SG-00001.dwg. Planning and regulatory data include: Code of land space control rules for the core monitoring area of ​​the river Tianjin section YH-JSXM-JSGF-DB12-00001.pdf. The naming rules are divided into units according to the "-" symbol. The "." symbol is followed by the file type extension. The last unit number in all codes is the number of this type of data. If there are multiple data, the numbers are accumulated in this unit;

[0127] 3D scene construction: extract the original spatial data after coding, and produce the 3D spatial analysis model and the surrounding status 3D model data according to the original data production specifications of the regulations. Name and code each constructed 3D model by category. The code is unique, and finally a three-dimensional 3D spatial analysis scene is formed. In addition, the attribute data establishes the attribute information database, and designs the software access interface.

[0128] River regulations database construction: extract the original data of planning regulations after coding, extract the data of relevant regulations and indicators of river protection planning, build a legal and regulatory information database, establish views and storage procedures, and design and add software access interfaces;

[0129] River location analysis: Extract the coded construction project and river 3D model data, conduct spatial location analysis of the construction project, identify the positional relationship between the construction project and the river in the 3D scene, determine the location of the construction project according to the regional location conditions stipulated in the river area protection regulations, automatically analyze and generate a regional overlap analysis table, automatically identify the distance between the construction project and the surrounding key buildings, and mark the distance, identify the top view range and output the location analysis map;

[0130] Building height box analysis: extract the encoded raw data, identify the buildings to be analyzed in the three-dimensional scene, identify the river bank, extract the river protection regulations and indicators, simulate and construct the building height limit box, obtain the buildings that exceed the height required by the regulations through superposition analysis, extract the building height information and building area information, generate the analysis result table, plot the building height value and highlight the super-high height value. At the same time, extract the construction project and surrounding buildings, calculate the average height according to the area range, generate the average height box of the area range, and plot the height, and finally output the height limit box analysis diagram and the average height box analysis diagram;

[0131] Section analysis: extract the encoded raw data, identify the buildings to be analyzed in the 3D scene, identify the river bank, identify the section plane, calculate the distance scale between the buildings on the section plane and the river bank and partition line, including the spacing, width, and height information, and plot the calculation result values ​​and the angle lines required by regulations in the 3D window, identify the viewpoint position and direction of the section plane, and finally generate a section analysis diagram;

[0132] Visual corridor analysis: extract the encoded raw data, identify the scope of the construction project in the three-dimensional scene, identify the location of the surrounding key buildings, and conduct corridor analysis between the construction project relative to the viewpoint and the key buildings according to the input viewpoint position, conduct visual occlusion analysis on the construction project with respect to the viewpoint position, and plot the relevant information, and finally output the corridor analysis diagram, visual occlusion analysis diagram and bird's-eye view analysis diagram;

[0133] Result output: The result graphs, tables, and texts obtained from the analysis in the above steps shall be compiled into documents according to the requirements of laws and regulations to form a report on the results. Result output: The result graphs, tables, and texts obtained from the analysis in the above steps shall be compiled into documents according to the requirements of laws and regulations to form a report on the results.

[0134] like Figure 2 A three-dimensional space control method for a construction project near a river is shown, wherein the three-dimensional scene construction steps are specifically: three-dimensional model construction of the river and surrounding buildings, three-dimensional model construction of the construction project, and three-dimensional scene integration; wherein:

[0135] Construction of 3D model of the river channel and surrounding structures: Extracting the original data of the river channel and surrounding ground data, and constructing the complete 3D model of the ground structures and geographical elements;

[0136] Construction of 3D models of construction projects: Extracting original data of design drawings and renderings of construction projects, and constructing detailed 3D models of buildings and landscapes of construction projects;

[0137] 3D scene integration: Integrate the 3D ground model data around the river and the 3D model data of the construction project into a unified standard and coordinate system to form a 3D management and analysis scene for the river construction project, which is then loaded into the 3D software for rendering and display.

[0138] like Figure 3 A three-dimensional spatial control method for a construction project near a river is shown, wherein the steps of constructing a river regulations database are specifically: river regulations classification, control index extraction, and river regulations database construction; wherein:

[0139] River regulations classification: extract the original data of regulations related to river construction project protection, and classify them by indicators, levels and types;

[0140] Extraction of control indicators: Extract river protection indicator limit data, classify and establish indicator requirement data tables;

[0141] River regulations database construction: extract the results of the first two steps, establish a relational river regulations database, and design and add a database query interface.

[0142] like Figure 4 A three-dimensional space control method for a construction project near a river is shown, wherein the river location analysis steps are specifically: building identification, location calculation, and location analysis map output; wherein:

[0143] Building recognition: Extract the original data of the 3D scene, select the building data of the construction project and the surrounding key buildings according to the building data feature value information of the construction project and the surrounding key buildings, and perform building coding for the construction project;

[0144] Location calculation: Based on the identified characteristic information of the construction project building and the river protection line information, the location information of the construction project is obtained after superposition, and the mapping relationship between the building and the location is established and stored in the database table;

[0145] Location analysis map output: extract multiple location analysis mapping relationship data respectively, mark the distance between the building and the river, the area where the building is located, the distance between the building and the surrounding key buildings in the three-dimensional scene, mark the building name, key building name, important community name, surrounding project name and road name, identify the viewpoint orientation of the river panoramic project point map and the project panoramic map, adjust the viewpoint orientation in the three-dimensional scene, and output the map with large resolution and specifications to form the final location analysis results map.

[0146] like Figure 5 A three-dimensional space control method for a construction project near a river is shown, wherein the three-dimensional sectioning analysis steps are specifically: project identification, building identification, river bank identification, section line identification, scale calculation, and section analysis diagram output; wherein:

[0147] Building recognition: extract the original data of the 3D scene, select the building data according to the characteristic value information of the building data, and perform building coding;

[0148] Riverbank identification: Extract river data and riverbank data from the three-dimensional scene and encode the riverbank.

[0149] Section line recognition: extract the section line segments to be analyzed in the 3D scene and encode the section lines.

[0150] Scale calculation: According to the azimuth section of the cutting line, the river width, the distance from the building to the river bank, and the width of each section are calculated respectively;

[0151] Output of section analysis drawings: mark the building height, width distance, and cross-sectional distance in the three-dimensional scene, draw the river angle analysis line and mark it carefully, adjust the angle and direction of the viewpoint according to the section analysis line, highlight the buildings that do not comply with regulations, and finally output the section analysis drawings corresponding to each section line.

[0152] like Figure 6 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of building identification are:

[0153] Building feature input: Extract the original building feature data, including the feature codes of the building and surrounding building data of the construction project, and establish a mapping relationship between various types of buildings and feature codes.

[0154] Building coding: Based on the mapping relationship between the established building and feature code, a 3D building coding index is established, including the construction project building and its surrounding and key buildings, for quick pickup of 3D building data.

[0155] like Figure 7 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of the building location analysis are:

[0156] Building location calculation: extract original orthophoto data, urban built-up area data, historical urban area data, core monitoring area data, riverside ecological space data, protection area data, world cultural heritage buffer area data, ecological protection red line data, river management area data, construction project scope data, and quickly identify and obtain the three-dimensional building model of the construction project according to the building code of the construction project. Through spatial position superposition, the location of the construction project is obtained, which involves position superposition analysis and calculation of location disclosure, and sequentially calculates the position relationship between the construction project and the scope of each protection area;

[0157] It is known that the construction project scope extracted is assumed to be a polygon P, and each vertex of the polygon is P i (x i,y i ,z i ), each protected area is assumed to be a polygon Q, that is, it is necessary to calculate the solution E(P,Q) to determine the positional relationship between the two polygons, that is, to obtain the location of the construction project;

[0158]

[0159] Where: E(P,Q) represents the positional relationship between polygons P and Q, P i (x i ,y i ,z i ) is a vertex of polygon P and its three-dimensional spatial coordinate values, i = 0, 1, 2, 3, ... represents its vertex number, 0 represents a separation relationship, 1 represents an intersection relationship, P i in Q means that a vertex of polygon P is within the range of polygon Q. i Out ofQ means that every vertex of polygon P is not within the range of polygon Q;

[0160] like Figure 8 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of outputting the location analysis map are:

[0161] Relationship distance mapping: extract the surrounding key building codes, identify the key building 3D models, and the construction project building 3D models, draw the shortest distance marking line between the two, and mark the distance length value in yellow. The construction control zone line is cyan, the project land is red, the river management range line is light blue, the protection site point is orange, the heritage area boundary line is pink, and the river management range is blue;

[0162] Building location mapping: In the small-scale panoramic location analysis map, the location of the construction project is marked with a large red circle point. In the large-scale location analysis map, the construction project scope line is circled and marked with a polygon, and the color is red.

[0163] Location analysis map output: Through the construction project location and map size, the 3D scene camera position and orientation are identified according to the scale, and small-scale and large-scale building location analysis screenshots are obtained respectively, and finally output into high-definition resolution images.

[0164] like Fig. 9 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of river bank identification are:

[0165] Riverbank feature input: extract river channel 3D model data and input river channel features;

[0166] Riverbank feature coding: Based on the riverbank feature input, the riverbed model and riverbank model of the three-dimensional river are coded;

[0167] like Fig.10 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of the scale calculation are:

[0168] River width calculation: According to the riverbank code, extract the basic data of the riverbanks on both sides of the river and the boundary lines of each protection zone, use the input cutting line as the cutting section, obtain the cross-sectional width of the river at the section and the distance from each protection line to the riverbank on the same side, and establish a mapping to store the distance value.

[0169] Calculation of distance between buildings and rivers: Extract the construction project buildings and surrounding key buildings, use the input cutting line as the cutting section, obtain the shortest distance between the building and the riverbank on the same side at the section, and establish a mapping to store the distance value.

[0170] Slope calculation: extract the riverbank on the opposite side of the construction project, take the input cutting line as the cutting section, take the horizontal direction as the 0 degree direction, take the elevation angle α=18° and the distance height ratio δ=1 / 3, δ=1 / 4 as the height limit threshold, and obtain the height limit slope value. The specific calculation method is the same as the height limit box calculation formula.

[0171] like Fig.11 A three-dimensional space control method for a construction project near a river is shown, wherein the specific steps of outputting the cut analysis diagram are:

[0172] Analysis result plotting: According to the direction of the cutting line, extract the distance value mapping of the river width calculation, building river spacing calculation and slope calculation steps on both sides of the cutting line, and perform distance plotting and drawing of distance values ​​and angle values.

[0173] Camera orientation recognition: Based on the position of the cutting surface, the scope of the construction project and the river channel, with the construction project and the river channel as the center, the best viewing angle camera position and orientation of the cross sections on both sides are identified respectively, and then the three-dimensional scene on one side of the cutting surface about the viewpoint position is cut out through the three-dimensional scene cutting method to ensure the beauty of the interface diagram.

[0174] Output of section analysis diagram: extract the recognized camera position, perform viewpoint camera positioning respectively, display the 3D scene and plotting results of the current position respectively, and output the section analysis result diagram with high-definition resolution respectively.

[0175] In the specific implementation case: the three-dimensional model of the surrounding buildings and structures includes: three-dimensional model of the river channel, ground buildings and structures around the construction project, basic supporting facilities, urban landscape, urban roads, traffic signs, street lights, green plants, urban components, and other water systems; the three-dimensional model of the construction project includes: construction project buildings and structures, construction project landscape, security, supporting facilities, garages, and parking spaces; the contents of the location analysis map include: panoramic map of the construction project location and bird's-eye view location map of the construction project, among which the main content of the panoramic location map of the construction project is based on aerial images, superimposed with river vector maps, administrative division vector maps, urban building urban area vector maps, historical urban area vector maps, core monitoring area vector maps, riverside ecological space vector maps, protection area vector maps, world cultural heritage buffer zone vector maps, ecological protection red line vector maps, and river management area vector maps; the description part includes legal basis description maps, legends, project location thumbnails, construction project introductions, and map names. The main content of the bird's-eye view location map of the construction project takes the three-dimensional digital city model as the base map, and overlays the three-dimensional scene model of the river, the three-dimensional scene model of the construction project plan, the three-dimensional scene model of the surrounding status, the three-dimensional model of the project land use scope, the three-dimensional model of the river management scope, the three-dimensional model of the heritage buffer zone, the three-dimensional model of the construction control zone line, the three-dimensional model of the riverside ecological space and the three-dimensional model of the cultural relics location. The explanatory part includes the eagle-eye map of the construction project, the legend, the analysis conclusion and the map name; the main content of the section analysis map takes the three-dimensional digital city model as the background, takes the close-up viewpoints on both sides of the section, and overlays the section analysis angle threshold vector map and the distance annotation vector map. The explanatory part includes the eagle-eye map of the construction project, the analysis conclusion and the map name.

[0176] Advantages: The three-dimensional spatial control method of construction projects near rivers in the present invention uses three-dimensional geographic information technology for the first time to review construction projects in the field of protecting the ecological environment near rivers. The method has a high degree of intelligence, high precision in data and calculation values, and a high accuracy rate in results. It can intuitively and scientifically analyze the suitability and legality of construction project plans and their impact on the ecological environment around rivers. The method reduces labor costs, shortens the review period of construction projects, and improves the review efficiency of construction projects. It has significant social benefits and high promotion value.

[0177] Although the embodiments of the present invention have been described by way of example, those skilled in the art will appreciate that there are many modifications and variations of the present invention without departing from the spirit of the present invention. It is intended that the appended claims include these modifications and variations without departing from the spirit of the present invention.

Claims

1. A three-dimensional space control method for a construction project near a river, characterized in that: The method comprises the following steps: Data coding: Code and classify the project space data, surrounding space data, river space data, and river protection regulations required for the construction project, and organize them into various types of original data; 3D scene construction: extract the original data after coding, and make a 3D space control and analysis model for the river construction project in accordance with the requirements of river protection regulations. Name and code each 3D model object to finally form a 3D space analysis scene for the river construction project. River regulations database construction: extract the original data after coding, extract the relevant laws and regulations and indicator data of river protection planning, and build a river law and regulation resource database; River location analysis: Extract the coded construction project and river 3D model data, conduct spatial location analysis of the construction project, identify the location relationship between the construction project and the river, determine the location of the construction project according to the regional location conditions stipulated in the river area protection regulations, automatically analyze and generate a regional overlap analysis table, automatically identify the distance between the construction project and the surrounding key buildings, and mark the distance, identify the top view range and output the location analysis map; Building height box analysis: extract the encoded raw data, identify the buildings to be analyzed in the three-dimensional scene, identify the river bank, extract the river protection regulations and indicators, simulate and construct the building height limit box, obtain the buildings that exceed the height required by the regulations through superposition analysis, extract the building height information and building area information, generate the analysis result table, plot the building height value and highlight the super-high height value; extract the construction project and surrounding buildings, calculate the average height according to the area range, generate the average height box of the area range, and plot the height, and finally output the corridor analysis diagram, the view occlusion analysis diagram and the bird's-eye view analysis diagram; Section analysis: extract the encoded raw data, identify the buildings to be analyzed in the 3D scene, identify the river bank, identify the section plane, calculate the distance scale between the buildings on the section plane and the river bank and partition line, including the spacing, width, and height information, and plot the calculation result values ​​and the angle lines required by regulations in the 3D window, identify the viewpoint position and direction of the section plane, and finally generate a section analysis diagram; Visual corridor analysis: extract the encoded raw data, identify the scope of the construction project in the three-dimensional scene, identify the location of the surrounding key buildings, and conduct corridor analysis between the construction project relative to the viewpoint and the key buildings according to the input viewpoint position, conduct visual occlusion analysis on the construction project with respect to the viewpoint position, and plot the relevant information, and finally output the corridor analysis diagram, visual occlusion analysis diagram and bird's-eye view analysis diagram; Result output: The result graphs, tables, and texts obtained from the analysis in the above steps shall be compiled into documents in accordance with regulatory requirements to form a results report.

2. A three-dimensional space control method for a construction project near a river according to claim 1, characterized in that: The three-dimensional scene construction specifically includes: three-dimensional model construction of the river and surrounding buildings, three-dimensional model construction of the construction project, and three-dimensional scene integration; wherein: Construction of 3D model of the river channel and surrounding structures: Extracting the original data of the river channel and surrounding ground data, and constructing the complete 3D model of the ground structures and geographical elements; Construction of 3D models of construction projects: extracting original data of design drawings and renderings of construction projects, and constructing detailed 3D models of buildings and landscapes of construction projects; 3D scene integration: Integrate the 3D ground model data around the river and the 3D model data of the construction project into a unified standard and coordinate system to form a 3D management and analysis scene for the river construction project.

3. A three-dimensional space control method for a construction project near a river according to claim 1, characterized in that: The steps of constructing a river regulations database are specifically as follows: river regulations classification, control index extraction, and river regulations database construction; wherein: River regulations classification: extract the original data of regulations related to river construction project protection, and classify them by indicators, grades and types; Extraction of control indicators: Extract river protection indicator limit data and establish indicator requirement data table; River regulations database construction: Extract the results of the first two steps and establish a relational river regulations database.

4. A three-dimensional space control method for a construction project near a river according to claim 1, characterized in that: The river location analysis steps are specifically: building identification, location calculation, and location analysis map output; wherein: Building recognition: Extract the original data of the 3D scene, select the building data of the construction project and the surrounding key buildings according to the building data feature value information of the construction project and the surrounding key buildings, and perform building coding for the construction project; Location calculation: Based on the identified characteristic information of the construction project building and the river protection line information, the location information of the construction project is obtained after superposition, and the mapping relationship between the building and the location is established and stored in the database table; Location analysis map output: extract multiple location analysis mapping relationship data respectively, mark the distance between the building and the river, the area where the building is located, the distance between the building and the surrounding key buildings in the three-dimensional scene, mark the building name, key building name, important community name, surrounding project name and road name, identify the viewpoint orientation of the river panoramic project point map and the project panoramic map, adjust the viewpoint orientation in the three-dimensional scene, and output the map with large resolution and specifications to form the final location analysis results map.

5. A three-dimensional space control method for a construction project near a river according to claim 1, characterized in that: The three-dimensional section analysis steps are specifically: project identification, building identification, river bank identification, section line identification, scale calculation, and section analysis diagram output; wherein: Building recognition: extract the original data of the 3D scene, select the building data according to the characteristic value information of the building data, and perform building coding; Riverbank identification: extract river data and riverbank data from the 3D scene and encode the riverbank; Section line recognition: extract the section line segments to be analyzed in the 3D scene and encode the section lines; Scale calculation: According to the azimuth section of the cutting line, the river width, the distance from the building to the river bank, and the width of each section are calculated respectively; Output of section analysis drawings: mark the building height, width distance, and cross-sectional distance in the three-dimensional scene, draw the river angle analysis line and mark it carefully, adjust the angle and direction of the viewpoint according to the section analysis line, highlight the buildings that do not comply with regulations, and finally output the section analysis drawings corresponding to each section line.

6. A three-dimensional space control method for a construction project near a river according to claim 4, characterized in that: The specific steps of the building identification are: Building feature input: extract the original building feature data, including the feature codes of the building and surrounding building data of the construction project, and establish the mapping relationship between various types of buildings and feature codes; Building coding: Based on the mapping relationship between the established building and feature code, a 3D building coding index is established, including the construction project building and its surrounding and key buildings, for quick pickup of 3D building data.

7. A three-dimensional space control method for a construction project near a river according to claim 4, characterized in that: The specific steps of the building location analysis are: Building location calculation: extract original orthophoto data, urban built-up area data, historical urban area data, core monitoring area data, riverside ecological space data, protection area data, world cultural heritage buffer area data, ecological protection red line data, river management area data, construction project scope data, and quickly identify and obtain the three-dimensional building model of the construction project according to the building code of the construction project. Through spatial position superposition, the location of the construction project is obtained, which involves position superposition analysis and calculation of location disclosure, and sequentially calculates the position relationship between the construction project and the scope of each protection area; It is known that the extracted construction project range is assumed to be a polygon P, and each vertex of the polygon is P i (x i ,y i ,z i ), each protected area is assumed to be a polygon Q, that is, it is necessary to calculate the solution E(P,Q) to determine the positional relationship between the two polygons, that is, to obtain the location of the construction project; Where: E(P,Q) represents the positional relationship between polygons P and Q, P i (x i ,y i ,z i ) is a vertex of polygon P and its three-dimensional spatial coordinate values, i = 0, 1, 2, 3, ... represents its vertex number, 0 represents a separation relationship, 1 represents an intersection relationship, P i inQ means that a vertex of polygon P is within the range of polygon Q. i Out of Q means that every vertex of polygon P is not within the range of polygon Q.

8. A three-dimensional space control method for a construction project near a river according to claim 4, characterized in that: The specific steps of outputting the location analysis map are as follows: Relationship distance mapping: extract the codes of key buildings in the surrounding area, identify the 3D models of key buildings and the 3D models of construction project buildings, draw the shortest distance marking line between the two, and mark the distance length value. The color is yellow, the color of the construction control zone line is cyan, the color of the project land is red, the color of the river management range line is light blue, the color of the protected site points is orange, the color of the heritage area boundary line is pink, and the color of the river management range is blue; Building location mapping: In the small-scale panoramic location analysis map, the location of the construction project is marked with a large red circle point, and in the large-scale location analysis map, the construction project scope line polygon circle marking method is used, and the color is red; Location analysis map output: Through the construction project location and map size, the 3D scene camera position and orientation are identified according to the scale, and small-scale and large-scale building location analysis screenshots are obtained respectively, and finally output into high-definition resolution images.

9. A three-dimensional space control method for a construction project near a river according to claim 5, characterized in that: The specific steps of river bank identification are: Riverbank feature input: extract river channel 3D model data and input river channel features; Riverbank feature coding: Based on the riverbank feature input, the riverbed model coding and riverbank model coding of the three-dimensional river are performed.

10. A three-dimensional space control method for a construction project near a river according to claim 5, characterized in that: The specific steps of the scale calculation are: River width calculation: According to the river bank code, extract the basic data of the river bank on both sides of the river and the boundary lines of each protection zone, take the input section line as the section, obtain the cross-sectional width of the river at the section and the distance from each protection line to the river bank on the same side, and establish a mapping to store the distance value; Calculation of distance between buildings and rivers: Extract the construction project buildings and surrounding key buildings, use the input cutting line as the cutting section, obtain the shortest distance between the building at the section and the river bank on the same side, and establish a mapping to store the distance value; Slope calculation: extract the riverbank on the opposite side of the construction project, take the input cutting line as the cutting section, take the horizontal direction as the 0 degree direction, take the elevation angle α=18° and the distance height ratio δ=1 / 3 and δ=1 / 4 as the height limit thresholds, and obtain the height limit slope value. The specific calculation method is the same as the height limit box calculation formula.

11. A three-dimensional space control method for a construction project near a river according to claim 5, characterized in that: The specific steps of outputting the section analysis diagram are as follows: Analysis result plotting: according to the direction of the section line, extract the distance value mapping of the river width calculation, building river spacing calculation and slope calculation steps on both sides of the section line, and perform distance plotting and distance value and angle value plotting; Camera orientation recognition: Based on the position of the section plane, the scope of the construction project and the location of the river channel, the best viewing angle camera position and orientation of the sections on both sides are identified with the construction project and the river channel as the center, and then the 3D scene on one side of the section plane about the viewpoint position is cut out by the 3D scene cutting method; Output of section analysis diagram: extract the recognized camera position, perform viewpoint camera positioning respectively, display the 3D scene and plotting results of the current position respectively, and output the section analysis result diagram with high-definition resolution respectively.

12. A three-dimensional space control method for a construction project near a river according to any one of claims 1 to 11, characterized in that: The 3D models of surrounding buildings and structures include: 3D model of river channel, ground buildings and structures around the construction project, basic supporting facilities, urban landscape, urban roads, traffic signs, street lights, green plants, urban components, and other water systems; the 3D model of the construction project includes: construction project buildings and structures, construction project landscape, security, supporting facilities, garages, and parking spaces; the contents of the location analysis map include: panoramic map of the construction project location and bird's-eye view location map of the construction project. The main content of the panoramic location map of the construction project is based on aerial images, with superimposed river vector maps, administrative division vector maps, urban building urban vector maps, historical urban vector maps, core monitoring area vector maps, riverside ecological space vector maps, protection range vector maps, world cultural heritage buffer zone vector maps, ecological protection red line vector maps, and river management range vector maps. The explanation part includes the legal basis illustration, legend, project location thumbnail, construction project introduction and map name; the main content of the construction project bird's-eye view location map takes the three-dimensional digital city model as the base map, superimposed with the three-dimensional scene model of the river, the three-dimensional scene model of the construction project plan, the three-dimensional scene model of the surrounding status, the three-dimensional model of the project land use scope, the three-dimensional model of the river management scope, the three-dimensional model of the heritage buffer zone, the three-dimensional model of the construction control zone line, the three-dimensional model of the riverside ecological space and the three-dimensional model of the cultural relics site; the explanation part includes the construction project eagle-eye map, legend, analysis conclusion and map name; the main content of the section analysis map takes the three-dimensional digital city model as the background, takes the close-up viewpoints on both sides of the section, and superimposes the section analysis angle threshold vector map and the distance annotation vector map; the explanation part includes the construction project eagle-eye map, analysis conclusion and map name.

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