A method for evaluating space efficiency of a stereoscopic block form

Abstract

The application discloses a kind of stereoscopic block form space efficiency evaluation methods, it is related to urban renewal technical field, obtains the original map data in given area, extracts the stereoscopic boundary and element of given area from original map data;According to stereoscopic boundary and element, establish stereoscopic block form model and stereoscopic block network block model, stereoscopic block network block model includes the network block model before public area stereoscopic space construction and the network block model after public area stereoscopic space construction;Further, the space efficiency evaluation index of stereoscopic block form is obtained, and the space efficiency evaluation index of stereoscopic block form includes network accessible ratio, block accessible ratio, public space ratio, and space efficiency index.The application realizes the accurate identification of stereoscopic city network and block space.

Description

Technical Field

[0001] This invention relates to the field of urban renewal technology, and in particular to a method for evaluating the spatial efficiency of three-dimensional street block morphology. Background Technology

[0002] As high-density urban development enters the stock renewal stage, the three-dimensional development of high-density urban space has become an important strategy for improving land use efficiency and optimizing urban resources. However, current high-density urban development faces the dual dilemmas of "three-dimensional spatial resource misallocation" and the "black box of three-dimensional network efficiency." Traditional two-dimensional evaluation systems are unable to analyze the spatial value transmission mechanism of three-dimensional blocks, leading to the following three major pain points:

[0003] 1. Form-function separation: Existing methods have severed the connection between network accessibility and the economic value of functional blocks, and cannot quantify the contribution of public space construction to urban land value appreciation.

[0004] 2. Distortion in performance evaluation: Existing technologies have failed to effectively extract the performance generated by the three-dimensional network space itself, resulting in the investment benefits of public land not being effectively quantified and analyzed.

[0005] 3. Lack of decision-making basis: There is a lack of standardized three-dimensional spatial efficiency index and a lack of an evaluation system that takes into account both input and output of three-dimensional construction, making it difficult to support the precise allocation of public space under the concept of "smart shrinkage".

[0006] Existing technologies suffer from the inability to accurately identify three-dimensional urban networks and block spaces, and the inability to effectively quantify and analyze the spatial efficiency of three-dimensional urban forms during urban design. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a spatial efficiency evaluation method for three-dimensional urban block morphology. The present invention solves the problem that the spatial efficiency of three-dimensional urban morphology in the process of urban design cannot be effectively quantified and analyzed, and realizes the accurate identification of three-dimensional urban networks and block space.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A spatial efficiency evaluation method for three-dimensional streetscape proposed according to the present invention includes:

[0010] Obtain the original map data for a given area, and extract the 3D boundary and features of the given area from the original map data;

[0011] Based on the three-dimensional boundaries and elements, a three-dimensional street block morphology model and a three-dimensional street block network block model are established. The three-dimensional street block network block model includes the network block model before the construction of the three-dimensional space in the public area and the network block model after the construction of the three-dimensional space in the public area. The network block model before the construction of the three-dimensional space in the public area is called the development plot three-dimensional network block model, and the network block model after the construction of the three-dimensional space in the public area is called the overall three-dimensional network block model.

[0012] Based on the established three-dimensional street block morphology model, the three-dimensional network block model of development plots, and the overall three-dimensional network block model, spatial efficiency evaluation indicators for three-dimensional street block morphology are obtained. These spatial efficiency evaluation indicators include network accessibility, block accessibility, public space ratio, and spatial efficiency index.

[0013] As a further optimization of the spatial efficiency evaluation method for three-dimensional streetscape described in this invention, the method for establishing a three-dimensional streetscape model is as follows:

[0014] Based on the three-dimensional base surface and boundaries, as well as the division of public areas and development plots in a given area, a three-dimensional street block morphology model is established, which is abstracted from the original map data and consists of a three-dimensional base surface and connecting nodes.

[0015] As a further optimization of the spatial efficiency evaluation method for three-dimensional street block morphology described in this invention, the method for establishing a three-dimensional street block network block model is as follows:

[0016] The network and blocks in a given area are divided. Based on the division of the network and blocks, a topological analysis model is established that abstracts the road network and building functional volumes into lines and surfaces. This topological analysis model is a three-dimensional street network block model. Furthermore, based on the division of public areas and development plots in the given area, the three-dimensional street network block model is divided into a network block model before the construction of the three-dimensional space in the public area and a network block model before the construction of the three-dimensional space in the public area.

[0017] As a further optimization of the spatial efficiency evaluation method for the three-dimensional street block form described in this invention, the network accessibility ratio is the ratio of the accessibility of the overall three-dimensional network to the accessibility of the three-dimensional network of the development plot. It is used to characterize the improvement level of the public three-dimensional network in the three-dimensional area on the potential to attract accessible pedestrian flow, and to reflect the ability of the public three-dimensional network space to affect the accessibility and connection efficiency of each building space.

[0018]

[0019] in, and The network proximity of the overall three-dimensional network block model and the three-dimensional network block model of the development plots are respectively. and These represent the path lengths of the overall three-dimensional network block model and the development plot three-dimensional network block model, respectively. NAR represents the network reachability ratio, A represents the overall three-dimensional network block model, and B represents the development plot three-dimensional network block model.

[0020] As a further optimization of the spatial efficiency evaluation method for the three-dimensional street block form described in this invention, the block accessibility ratio is the ratio of the accessibility of the overall three-dimensional block to the accessibility of the three-dimensional block of the development plot, which is used to characterize the improvement level of the accessibility of blocks within the three-dimensional area; the accessibility of the overall three-dimensional block is weighted by the block area, and the accessibility of the three-dimensional block of the development plot is weighted by the street length.

[0021]

[0022] in, and These are the block proximity values ​​for the overall three-dimensional network block model and the development plot three-dimensional network block model, respectively. and These represent the block areas of the overall three-dimensional network block model and the three-dimensional network block model of the development plots, respectively, with BAR representing the block accessibility ratio.

[0023] As a further optimization of the spatial efficiency evaluation method for three-dimensional street block morphology described in this invention, the public space ratio is the ratio of the construction area of ​​the three-dimensional network space of the public area to the projected area of ​​the three-dimensional base surface. It is used to characterize the public network space area of ​​a unit three-dimensional area and reflect the development intensity of the public network space.

[0024]

[0025] Where S is the area of ​​the public area three-dimensional network space construction, P is the projected area of ​​the three-dimensional base surface, and PSR is the public space ratio.

[0026] As a further optimization of the spatial efficiency evaluation method for the three-dimensional street block morphology described in this invention, the spatial efficiency index SEI is the ratio of the sum of network accessibility ratio (NAR) and block accessibility ratio (BAR) to public space ratio (PSR). The spatial efficiency index comprehensively considers the input and output values ​​of public network space construction, characterizes the accessibility improvement value provided by a unit of public network space to the three-dimensional street block, and reflects the spatial efficiency of a given three-dimensional street block.

[0027]

[0028] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, it implements the steps of the spatial efficiency evaluation method for three-dimensional street morphology as described above.

[0029] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the spatial efficiency evaluation method for three-dimensional streetscape morphology as described above.

[0030] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0031] (1) This invention solves the problem that the spatial efficiency of three-dimensional urban forms in the process of urban design cannot be effectively quantified and analyzed, and realizes the accurate identification of three-dimensional urban networks and block spaces.

[0032] (2) Comprehensive evaluation of form-function linkage: This technical solution takes into account both network accessibility and the economic value of functional blocks, and can accurately quantify the contribution of public three-dimensional space construction to urban land value increase.

[0033] (3) Focus on three-dimensional performance evaluation: This technical solution effectively extracts the performance generated by the three-dimensional network space itself, thereby effectively quantifying and analyzing the investment benefits of public land parcels;

[0034] (4) Provide comprehensive decision-making basis: Establish a standardized three-dimensional spatial efficiency index, establish an evaluation system that takes into account both input and output of three-dimensional construction, and support the precise allocation of public space under the concept of "smart shrinkage". Attached Figure Description

[0035] Figure 1 A summary diagram (dwg format) of the defined 3D research boundary and related 3D elements;

[0036] Figure 2 A three-dimensional street block morphology model generated based on data after identifying the boundaries of the three-dimensional street block;

[0037] Figure 3 To develop a plot grid model for three-dimensional street blocks based on morphological models and related data;

[0038] Figure 4 A three-dimensional street network model based on morphological models and related data;

[0039] Figure 5a , Figure 5b These are distribution maps showing the network accessibility results before and after the construction of the three-dimensional network in public areas of Central.

[0040] Figure 6a , Figure 6b These are distribution maps showing the accessibility results of blocks in the Central area before and after the construction of the three-dimensional network of public areas;

[0041] Figure 7 This is a list of the calculated results for the proximity, length, and other parameters of each road network in the Central Ring area.

[0042] Figure 8 This is a flowchart of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] Figure 8 The flowchart of this invention illustrates a method for evaluating the spatial efficiency of three-dimensional streetscapes, comprising:

[0045] Obtain the original map data for a given area, and extract the 3D boundary and features of the given area from the original map data;

[0046] Based on the three-dimensional boundaries and elements, a three-dimensional street block morphology model and a three-dimensional street block network block model are established. The three-dimensional street block network block model includes the network block model before the construction of the three-dimensional space in the public area and the network block model after the construction of the three-dimensional space in the public area. The network block model before the construction of the three-dimensional space in the public area is called the development plot three-dimensional network block model, and the network block model after the construction of the three-dimensional space in the public area is called the overall three-dimensional network block model.

[0047] Based on the established three-dimensional street block morphology model, the three-dimensional network block model of development plots, and the overall three-dimensional network block model, spatial efficiency evaluation indicators for three-dimensional street block morphology are obtained. These spatial efficiency evaluation indicators include network accessibility, block accessibility, public space ratio, and spatial efficiency index.

[0048] The principle of three-dimensional urban element identification and spatial efficiency calculation is as follows;

[0049] 1.1 Identifying the characteristic elements of a three-dimensional urban form:

[0050] 1.1.1 Ground and Base Surface: The "ground layer" is defined as the original natural terrain surface, or the surface of artificial structures that have been engineered and integrated into the natural terrain. The "base surface" refers to the reference surface that bears public activities and functions. In vertical cities, in addition to the ground as the base surface, three-dimensional base surfaces in the air and underground are also derived, increasing the area for public activities in the vertical dimension.

[0051] 1.1.2 Public Areas and Development Land: Public land such as roads, squares, and green spaces, along with development plots and their internal buildings, constitute the permanent form of a city. Generally, the former is constructed by the government and its development platforms, undertaking more public functions, while the latter is built by developers and has relatively lower public characteristics. However, the division of labor in a vertical city does not follow the principle of planar segmentation. The development of plots occupied or adjacent to railway stations, subway lines, and bus stations often requires government and its development platforms to lead the construction. Plots and buildings owned by private developers often contribute some space to integrate into the city, thus development plots also possess strong public service functions.

[0052] 1.1.3 Three-dimensional base surface and connecting nodes: A three-dimensional base surface is a prerequisite for determining whether an urban area is three-dimensional, and both public areas and development land can undertake the construction of a three-dimensional base surface. Its establishment requires the following:

[0053] 1) It must be a continuous, completely public space that is off the ground;

[0054] 2) Connects two or more blocks (areas enclosed by urban municipal roads) or two or more development plots through a non-ground level.

[0055] Connecting nodes are the elements that establish spatial connections between different base surfaces. The more connecting nodes per unit area, the higher the connection efficiency of that base surface.

[0056] 1.1.4 Networks and Blocks: Networks and blocks are abstract representations of the inherent logic and texture of urban form. Networked space is a key channel connecting various blocks in a city and promoting the flow of materials and information, manifested as transportation networks, green corridors, water systems, and public facility chains. Blocked space is the basic unit of urban physical space, including regions, cities, blocks, plots, and even buildings. They are relatively fixed and carry specific functions of urban life and production. In this technology, a block is the smallest functional spatial unit inside and outside a building, such as commercial activity areas within a complex, shops in connecting corridors or underground streets, etc.

[0057] 1.1.5 Three-Dimensional Network Space: Planar network space includes ground-level public pedestrian areas such as sidewalks, zebra crossings, pedestrian streets, and internal roads within public land. Three-dimensional network space includes public urban pedestrian areas on elevated or underground three-dimensional surfaces, generally including the following three categories: 1. Elevated or underground roads connecting public land, such as underground commercial areas and elevated walkways. 2. Indoor and outdoor urban roads on three-dimensional surfaces, such as walkways within connected two-story shopping malls and road networks formed by outdoor building platforms. 3. Vertical nodes connecting three-dimensional surfaces, such as escalators, elevators, stairs, ramps, and terraces.

[0058] 1.2 Constructing spatial efficiency measurement indicators for three-dimensional cities:

[0059] Based on the identification of three-dimensional urban street morphological elements, a measurement index and evaluation system for morphological spatial efficiency are established:

[0060] 1.2.1 Reachability Calculation:

[0061] Closeness measures the total distance cost required to travel from a given starting point to any other location within a certain radius. It reflects the accessibility of a street / block, or the potential of that street / block to attract arrival traffic.

[0062] Network proximity C n :

[0063]

[0064] Where: x is the road segment to be calculated; Rx is the set of other road segments reachable from road segment x within a given radius R; d(x,y) is the shortest distance from road segment x to road segment y.

[0065] Block proximity C b :

[0066]

[0067] Where: i is the block to be calculated; Ri is the set of other road segments reachable from block i within a given radius R; and d(i,j) is the shortest distance from block i to road segment j along the road network.

[0068] 1.2.2 Performance Measurement Index:

[0069] 1) Network Accessibility Ratio: The Network Accessibility Ratio is the ratio of the accessibility of the overall three-dimensional network to the accessibility of the three-dimensional network within a development site. It characterizes the level of improvement that the public three-dimensional network in the area enhances the potential for attracting accessible pedestrian traffic, reflecting the ability of the public three-dimensional network space to influence the accessibility and connectivity efficiency of individual building spaces. Because longer roads have a greater impact on the overall road network, the accessibility of the three-dimensional network is calculated as the product of the proximity of each path and the corresponding path length. The calculation formula is:

[0070]

[0071] in, and The network proximity of the overall three-dimensional network model and the three-dimensional network model of the development plots are respectively. and These are the path lengths for the overall network model and the development plot network model, respectively.

[0072] 2) Block Accessibility Ratio: The Block Accessibility Ratio is the ratio of the overall accessibility of a three-dimensional block (weighted block area) to the accessibility of the three-dimensional blocks within a development area (weighted street length). It characterizes the improvement in accessibility of blocks within a three-dimensional area. Because larger blocks have a greater impact on the overall area, the accessibility of a three-dimensional block is calculated as the product of the block's proximity and its corresponding area. The formula is:

[0073]

[0074] in, and These are the block proximity values ​​for the overall three-dimensional network model and the development plot network model, respectively. and These are the block areas of the overall network model and the development plot network model, respectively.

[0075] 3) Public Space Ratio: The public space ratio is the ratio of the area of ​​the constructed public network space to the area of ​​the three-dimensional area. It represents the area of ​​public network space per unit of three-dimensional area and reflects the development intensity of public network space. The calculation formula is:

[0076]

[0077] Where S is the area of ​​the public area three-dimensional network space construction, and P is the projected area of ​​the three-dimensional base surface.

[0078] 4) Space Efficiency Index: The Space Efficiency Index is the ratio of the sum of Network Accessibility (NAR) and Block Accessibility (BAR) to the Public Space Ratio (PSR). The Space Efficiency Index comprehensively considers the input and output value of public network space construction, characterizing the accessibility improvement value that a unit of public network space can provide to a three-dimensional area, reflecting the spatial efficiency of that three-dimensional block. The calculation formula is:

[0079]

[0080] Taking the spatial efficiency calculation of the three-dimensional urban form in Central, Hong Kong as an example:

[0081] 1. Determine the boundaries of the three-dimensional urban area and obtain raw data: First, use methods such as satellite maps and field surveys to delineate the research boundaries, including spatial information of public and development plots. The research boundaries of the three-dimensional city are determined by connecting three-dimensional base surfaces, which are located in underground or elevated layers (not ground level), forming a continuous urban public space system. All plots connected to these base surfaces are included in the research scope. Then, obtain the raw map data of the required research area through field surveys and mapping, and by downloading online map services (such as cadmapper, openstreetmap, etc.). Figure 1 As shown.

[0082] 2. Data Format Filtering and Processing, Establishing Spatial Morphology and Network Block Models: The obtained raw map data is filtered and processed to extract the information required for 3D modeling. All information is compiled into a DWG format map and used for 3D city-wide modeling in Rhino. Based on the identification of 3D elements, the modeling layers are divided into 3D base planes, horizontal links, etc., to establish a spatial morphology model, such as... Figure 2 As shown. Based on the spatial morphology model, a topological analysis model is established that abstracts the road network and building functional volumes into lines and surfaces. This topological analysis model is a three-dimensional street network block model. Furthermore, based on the division of public areas and development plots within a given region, the three-dimensional street network block model is divided into a development plot three-dimensional network block model and an overall three-dimensional network block model, as shown. Figure 3 , 4 As shown.

[0083] 3. Calculate spatial efficiency indicators: After completing the three-dimensional urban morphology and network block model, the three-dimensional feature measurement indicators can be calculated based on the three-dimensional urban spatial efficiency indicator calculation principle in section 1.2.

[0084] (1) Calculate the network proximity C n , where d(x,y) is the shortest distance from road segment x to road segment y.

[0085] (2) Calculate the block proximity C b , where d(i,j) is the shortest distance from block i to road segment j along the road network.

[0086] (3) The ratio of the area of ​​the construction of the three-dimensional network space in the public area to the area of ​​the three-dimensional area is used as an input indicator.

[0087] (4) Based on network proximity C n Block proximity C b The Network Accessibility Ratio (NAR) and Block Accessibility Ratio (BAR) are calculated and summed to obtain the output value. The ratio of this output value to the input index PSR is the Spatial Efficiency Index (SEI) of the multi-level street block. The calculation results are as follows: Figure 5a, Figure 5b , Figure 6a , Figure 6b and 7 As shown, where, Figure 5a , Figure 5b The colors, ranging from warm to cool, represent walking accessibility from high to low. Figure 6a , Figure 6b The colors, ranging from warm to cool, represent walking accessibility from high to low.

[0088] (5) Based on the above steps, the network reachability ratio (NAR) of the central ring area is calculated to be 1.31, the block reachability ratio (BAR) is 1.37, the public space ratio (PSR) is 0.23, and the space efficiency index (SEI) is 11.65.

[0089] 4. Apply three-dimensional spatial efficiency evaluation indicators to compare and evaluate design schemes or case studies: Measure three-dimensional evaluation data from multiple cases to build a three-dimensional city database. This allows for horizontal comparisons between existing three-dimensional city cases, as well as vertical comparisons of the pre- and post-update states of three-dimensional city designs, to evaluate update schemes.

[0090] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, it implements the steps of the spatial efficiency evaluation method for three-dimensional street morphology as described above.

[0091] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the spatial efficiency evaluation method for three-dimensional streetscape morphology as described above.

[0092] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention can be implemented using various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0093] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0094] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0096] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0097] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for evaluating the spatial efficiency of three-dimensional streetscapes, characterized in that, include: Obtain the original map data for a given area, and extract the 3D boundary and features of the given area from the original map data; Based on the three-dimensional boundaries and elements, a three-dimensional street block morphology model and a three-dimensional street block network block model are established. The three-dimensional street block network block model includes the network block model before the construction of the three-dimensional space in the public area and the network block model after the construction of the three-dimensional space in the public area. The network block model before the construction of the three-dimensional space in the public area is called the development plot three-dimensional network block model, and the network block model after the construction of the three-dimensional space in the public area is called the overall three-dimensional network block model. Based on the established three-dimensional street block morphology model, the three-dimensional network block model of development plots, and the overall three-dimensional network block model, spatial efficiency evaluation indicators for three-dimensional street block morphology are obtained. The spatial efficiency evaluation indicators for three-dimensional street block morphology include network accessibility, block accessibility, public space ratio, and spatial efficiency index. Network accessibility is the ratio of the accessibility of the overall three-dimensional network to the accessibility of the three-dimensional network of the development site. It is used to characterize the level of improvement of the public three-dimensional network in attracting accessible pedestrian flow within the three-dimensional area, and reflects the ability of the public three-dimensional network space to affect the accessibility and connectivity efficiency of each building space. ； in, and The network proximity of the overall three-dimensional network block model and the three-dimensional network block model of the development plots are respectively. and These are the path lengths for the overall three-dimensional network block model and the three-dimensional network block model of the development plots, respectively. For network reachability, A is the overall three-dimensional network block model, and B is the three-dimensional network block model of the development plots; Block accessibility is the ratio of the accessibility of the overall three-dimensional block to the accessibility of the three-dimensional block in the development area. It is used to characterize the improvement level of accessibility of blocks within the three-dimensional area. The accessibility of the overall three-dimensional block is weighted by the block area, while the accessibility of the three-dimensional block in the development area is weighted by the street length. ； in, and These are the block proximity values ​​for the overall three-dimensional network block model and the development plot three-dimensional network block model, respectively. and These are the block areas of the overall three-dimensional network block model and the three-dimensional network block model of the development plots, respectively. Block reachability; The public space ratio is the ratio of the area of ​​the public area's three-dimensional network space to the projected area of ​​the three-dimensional base surface. It is used to characterize the area of ​​the public network space per unit of three-dimensional area and reflects the development intensity of the public network space. ； Where S represents the area of ​​the public area's three-dimensional network space, and P represents the projected area of ​​the three-dimensional base surface. For public space ratio; Space efficiency index It is the ratio of the sum of Network Accessibility (NAR) and Block Accessibility (BAR) to Public Space Ratio (PSR); the Spatial Efficiency Index comprehensively considers the input and output value of public network space construction, characterizes the accessibility improvement value provided by a unit of public network space to the three-dimensional block, and reflects the spatial efficiency of a given three-dimensional block. 。 2. The spatial efficiency evaluation method for a three-dimensional streetscape according to claim 1, characterized in that, The method for establishing a three-dimensional streetscape model is as follows: Based on the three-dimensional base surface and boundaries, as well as the division of public areas and development plots in a given area, a three-dimensional street block morphology model is established, which is abstracted from the original map data and consists of a three-dimensional base surface and connecting nodes.

3. The spatial efficiency evaluation method for a three-dimensional streetscape according to claim 2, characterized in that, The method for establishing a three-dimensional street network block model is as follows: The network and blocks in a given area are divided. Based on the division of the network and blocks, a topological analysis model is established that abstracts the road network and building functional volumes into lines and surfaces. This topological analysis model is a three-dimensional street network block model. Furthermore, based on the division of public areas and development plots in the given area, the three-dimensional street network block model is divided into a network block model before the construction of the three-dimensional space in the public area and a network block model before the construction of the three-dimensional space in the public area.

4. A computer device comprising a memory, a processor, and a computer program stored in the memory and capable of running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the spatial efficiency evaluation method for three-dimensional street block morphology as described in any one of claims 1 to 3.

5. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the spatial efficiency evaluation method for three-dimensional street morphology as described in any one of claims 1 to 3.

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