A high-precision three-dimensional modeling method for urban buildings based on stereo satellites

Abstract

The application discloses a kind of high-precision city building three-dimensional modeling method based on stereoscopic satellite, it is related to three-dimensional modeling technical field, the high-precision city building three-dimensional modeling method based on stereoscopic satellite includes the following operating steps: S1, obtains building satellite map;S2, area division;S3, height calculation;S4, record building size;S5, three-dimensional modeling;S6, residential area peripheral building image acquisition;S7, facade modeling;S8, analogy modeling and S9, supplementary modeling.This kind of high-precision city building three-dimensional modeling method based on stereoscopic satellite, for standard building, obtains the peripheral building image of the area where standard building is located, and based on building size, object and size on the building facade are marked, and in modeling software, object on peripheral building is analogically migrated to other buildings of same width, length in the same area by this, the modeling of standard building in the same area is quickly completed, and the workload of collecting building data is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of 3D modeling technology, specifically to a high-precision 3D modeling method for urban buildings based on stereo satellites. Background Technology

[0002] A 3D city model is a three-dimensional model created based on two-dimensional geographic information. Through program development, it has evolved into a 3D geographic information system. This system can be used to analyze the natural and construction elements of a city. Users can obtain a realistic and intuitive virtual urban environment experience through interactive operations, providing 3D information services for urban planning, construction, and operation decisions.

[0003] The existing 3D modeling of urban buildings requires knowledge of the basic information of each building, including exterior images, length, width and height dimensions. Therefore, a lot of time needs to be spent collecting various data on each building before actually carrying out 3D modeling, which greatly prolongs the modeling time. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-precision 3D modeling method for urban buildings based on stereo satellites, which solves the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-precision 3D modeling method for urban buildings based on stereo satellites, wherein the high-precision 3D modeling method for urban buildings based on stereo satellites includes the following operational steps:

[0006] S1. Obtain satellite imagery of the building:

[0007] The system utilizes satellite imagery to acquire building satellite images within the urban area to be modeled, which includes both stereoscopic satellite images and building distribution maps.

[0008] S2, Regional Division:

[0009] The buildings are classified into different regions based on the building distribution maps and the three-dimensional satellite images.

[0010] S3, Height Calculation:

[0011] The system calculates and records the angle of sunlight in the urban area to be modeled at different times, the projected area of ​​each building at each time, and the satellite tilt angle parameters, and uses the shadow method to calculate the actual height of each building.

[0012] S4. Record building dimensions:

[0013] Once the height of each building is known, the length and width dimensions in the top view of each building are obtained using a scale.

[0014] S5, 3D Modeling:

[0015] Based on the height, length, and width dimensions of each building, modeling software is used to create an initial model.

[0016] S6. Image acquisition of buildings surrounding residential areas:

[0017] Using the panoramic view function in the map software, obtain the facade images of the buildings surrounding the residential area. After obtaining the real-view images, form a straight line with the two widest points of the buildings in the image. This straight line is consistent with the length or width dimensions in the top view of each building. Use this straight line as a reference to mark the dimensions of each object on the surface of the building in the real-view image.

[0018] S7. Facade Modeling:

[0019] Based on the obtained real-world images and the dimensions of various objects on the building surface, supplementary modeling is performed in the 3D modeling to ensure that the model is consistent with the actual building shape.

[0020] S8, Analogical Modeling:

[0021] Since all residential buildings in the same residential area have the same shape and only differ in floor height, based on this, and having obtained the surface images and dimensions of the residential buildings surrounding the residential area, objects on the buildings of the surrounding residential buildings are moved to other residential buildings with the same length and width dimensions as the buildings of the surrounding residential buildings.

[0022] Furthermore, in step S1, the stereoscopic satellite image includes the actual top view of each building and the ground projection of each building caused by sunlight.

[0023] Furthermore, in step S1, the building distribution map includes the maximum planar outline of each building, and the corresponding building name is marked within the planar outline.

[0024] Furthermore, in step S6, the acquisition of facade images is not limited to using the panoramic image function in map software; building facade images can also be obtained through drone photography or manual photography.

[0025] Furthermore, in step S6, the objects on the building surface refer to the decorations and doors and windows on the building surface.

[0026] Furthermore, in step S7, the length and width dimensions of each height on the initial model can be modified based on the obtained real-scene image and the dimensions of each object on the building surface.

[0027] Furthermore, the high-precision 3D modeling method for urban buildings based on stereo satellites also includes the following operational steps:

[0028] S9, Supplementary Modeling:

[0029] The modeling methods in steps S6-S8 are applicable to areas with standardized buildings. For non-standardized buildings and buildings where it is inconvenient to obtain real-world images, it is necessary to contact the construction company to obtain the corresponding dimensions and appearance images of the building, and then input this information into the modeling software for supplementary modeling.

[0030] Furthermore, the high-precision 3D modeling method for urban buildings based on stereo satellites is applied to the field of 3D modeling of urban buildings.

[0031] This invention provides a high-precision 3D modeling method for urban buildings based on stereo satellites, which has the following advantages:

[0032] This high-precision 3D modeling method for urban buildings based on stereo satellite imagery uses stereo satellite images to obtain ground projection maps and building distribution maps of buildings. It then uses scale and shading methods to obtain the height, width, and length of each building. Next, it divides areas based on region names (e.g., residential areas, industrial zones, commercial zones) and determines whether buildings within an area are standard buildings based on the area name and building width and length. For standard buildings, it only needs to acquire images of the surrounding buildings in the area where the standard building is located, and identifies objects and their dimensions on the building facade based on the building's length and width. These objects are then transferred to other buildings of the same width and length in the same area using modeling software, thus quickly completing the modeling of standard buildings within the same area and significantly reducing the workload of collecting building data. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall operation process of a high-precision three-dimensional modeling method for urban buildings based on stereo satellites according to the present invention. Detailed Implementation

[0034] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0035] like Figure 1 As shown, the present invention provides a technical solution: a high-precision 3D modeling method for urban buildings based on stereo satellites, the method comprising the following steps:

[0036] S1. Obtain satellite imagery of the building:

[0037] The system utilizes satellite imagery to acquire building satellite images within the urban area to be modeled, which includes both stereoscopic satellite images and building distribution maps.

[0038] Among them, the stereo satellite image includes the actual top view of each building and the ground projection of each building due to sunlight, and the building distribution map includes the maximum planar outline of each building, with the corresponding building name marked within the planar outline;

[0039] S2, Regional Division:

[0040] Based on the three-dimensional satellite image and building distribution map, the buildings are divided into areas by name, such as residential area, industrial area, commercial area, etc. Among them, residential area and industrial area are most likely to have standardized buildings.

[0041] S3, Height Calculation:

[0042] The system calculates and records the angle of sunlight in the urban area to be modeled at different times, the projected area of ​​each building at each time, and the satellite tilt angle parameters, and uses the shadow method to calculate the actual height of each building.

[0043] S4. Record building dimensions:

[0044] Once the height of each building is known, the length and width dimensions in the top view of each building are obtained using a scale.

[0045] S5, 3D Modeling:

[0046] Based on the height, length, and width dimensions of each building, modeling software is used to create an initial model.

[0047] S6. Image acquisition of buildings surrounding residential areas:

[0048] Using the panoramic view function in the map software, obtain the facade images of the buildings surrounding the residential area. After obtaining the real-view images, form a straight line with the two widest points of the buildings in the image. This straight line is consistent with the length or width dimensions in the top view of each building. Use this straight line as a reference to mark the dimensions of each object on the surface of the building in the real-view image.

[0049] Among them, the acquisition of facade images is not limited to the panoramic image function in map software, but can also be obtained by drone shooting or manual shooting. The objects on the building surface refer to the decorations and doors and windows on the building surface.

[0050] This method can be used not only in residential areas but also in industrial and commercial areas. It can be used in any area where there are standardized buildings, which refer to buildings with a consistent appearance and style.

[0051] S7. Facade Modeling:

[0052] Based on the obtained real-world images and the dimensions of various objects on the building surface, supplementary modeling is performed in the 3D modeling to ensure that the model is consistent with the actual building shape.

[0053] Among them, based on the obtained real-world images and the dimensions of various objects on the building surface, the length and width dimensions of each height on the initial model can also be modified;

[0054] S8, Analogical Modeling:

[0055] Since all the residential buildings in the same residential area have the same shape and only differ in floor height, based on this, and having obtained the surface images and dimensions of the residential buildings on the periphery of the residential area, the objects on the periphery residential buildings are moved to other residential buildings with the same length and width dimensions as the periphery residential buildings.

[0056] S9, Supplementary Modeling:

[0057] The modeling methods in steps S6-S8 are applicable to areas with standardized buildings. For non-standardized buildings and buildings where it is inconvenient to obtain real-world images, it is necessary to contact the construction company to obtain the corresponding dimensions and appearance images of the building, and then input this information into the modeling software for supplementary modeling.

[0058] A high-precision 3D modeling method for urban buildings based on stereo satellites has been applied to the field of 3D modeling of urban buildings.

[0059] In summary, as Figure 1 As shown, this high-precision 3D modeling method for urban buildings based on stereo satellites first uses satellites to obtain satellite images of buildings within the urban area to be modeled. The building satellite images include stereo satellite images and building distribution maps. The stereo satellite images contain the actual top view of each building and the ground projection of each building due to sunlight. The building distribution map contains the maximum planar outline of each building and identifies the corresponding building name within the planar outline.

[0060] Then, based on the three-dimensional satellite image and building distribution map, the buildings are divided into areas by name, such as residential area, industrial area, commercial area, etc. Among them, residential area and industrial area are most likely to have standardized buildings, which refer to buildings with the same appearance style.

[0061] Then calculate and record the sunlight angle of the urban area to be modeled at different times, the projected area of ​​each building at each time, and the satellite tilt angle parameters. The actual height of each building is calculated using the shadow method. With the height of each building obtained, the length and width dimensions in the top view of each building are obtained using the scale.

[0062] Next, based on the height, length, and width dimensions of each building, modeling software is used to create the initial model.

[0063] Then, the panoramic view function in the map software is used to obtain real-view images of the facades of the buildings surrounding the residential area. After obtaining the real-view images, a straight line is formed by the two widest points of the buildings in the image. This straight line is consistent with the length or width dimensions in the top view of each building. The dimensions of each object on the surface of the building in the real-view image are marked by this straight line as a reference. The acquisition of facade real-view images is not limited to the panoramic view function in the map software. It can also be obtained by drone photography or manual photography. The objects on the surface of the building refer to the decorations and doors and windows on the surface of the building.

[0064] This method can be used not only in residential areas but also in industrial and commercial areas; it can be used wherever there are standardized buildings.

[0065] Then, based on the obtained real-scene images and the dimensions of each object on the building surface, supplementary modeling is carried out in the 3D modeling to make the model consistent with the actual building shape. In addition, based on the obtained real-scene images and the dimensions of each object on the building surface, the length and width dimensions of each height on the initial model can also be modified.

[0066] Subsequently, since all the residential buildings in the same residential area have the same shape and only differ in floor height, based on this, and having obtained the surface images and dimensions of the residential buildings on the periphery of the residential area, the objects on the periphery residential buildings were moved to other residential buildings with the same length and width dimensions as the periphery residential buildings.

[0067] Finally, for non-standard buildings where it is inconvenient to obtain real-world images, it is necessary to contact the builder to obtain the corresponding dimensions and appearance images of the building, and then input this information into the modeling software for supplementary modeling.

[0068] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A high-precision 3D modeling method for urban buildings based on stereo satellites, characterized in that: The high-precision 3D modeling method for urban buildings based on stereo satellites includes the following steps: S1. Obtain satellite imagery of the building: The system utilizes satellite imagery to acquire building satellite images within the urban area to be modeled, which includes both stereoscopic satellite images and building distribution maps. S2, Regional Division: The buildings are classified into different regions based on the building distribution maps and the three-dimensional satellite images. S3, Height Calculation: The system calculates and records the angle of sunlight in the urban area to be modeled at different times, the projected area of ​​each building at each time, and the satellite tilt angle parameters, and uses the shadow method to calculate the actual height of each building. S4. Record building dimensions: Once the height of each building is known, the length and width dimensions in the top view of each building are obtained using a scale. S5, 3D Modeling: Based on the height, length, and width dimensions of each building, modeling software is used to create an initial model. S6. Image acquisition of buildings surrounding residential areas: Using the panoramic view function in the map software, obtain the facade images of the buildings surrounding the residential area. After obtaining the real-view images, form a straight line with the two widest points of the buildings in the image. This straight line is consistent with the length or width dimensions in the top view of each building. Use this straight line as a reference to mark the dimensions of each object on the surface of the building in the real-view image. S7. Facade Modeling: Based on the obtained real-world images and the dimensions of various objects on the building surface, supplementary modeling is performed in the 3D modeling to ensure that the model is consistent with the actual building shape. S8, Analogical Modeling: Since all the residential buildings in the same residential area have the same shape and only differ in floor height, based on this, and having obtained the surface images and dimensions of the residential buildings on the periphery of the residential area, the objects on the periphery residential buildings are moved to other residential buildings with the same length and width dimensions as the periphery residential buildings. The high-precision 3D modeling method for urban buildings based on stereo satellites also includes the following steps: S9, Supplementary Modeling: The modeling methods in steps S6-S8 are applicable to areas with standardized buildings. For non-standardized buildings and buildings where it is inconvenient to obtain real-world images, it is necessary to contact the construction company to obtain the corresponding dimensions and appearance images of the building, and then input this information into the modeling software for supplementary modeling. The high-precision 3D modeling method for urban buildings based on stereo satellites is applied to the field of 3D modeling of urban buildings.

2. The high-precision 3D modeling method for urban buildings based on stereo satellites according to claim 1, characterized in that: In step S1, the stereo satellite image includes the actual top view of each building and the ground projection of each building caused by sunlight.

3. The high-precision 3D modeling method for urban buildings based on stereo satellites according to claim 1, characterized in that: In step S1, the building distribution map includes the maximum planar outline of each building, and the corresponding building name is marked within the planar outline.

4. The high-precision 3D modeling method for urban buildings based on stereo satellites according to claim 1, characterized in that: In step S6, the acquisition of facade images is not limited to using the panoramic image function in map software; building facade images can also be obtained through drone photography or manual photography.

5. The high-precision 3D modeling method for urban buildings based on stereo satellites according to claim 1, characterized in that: In step S6, the objects on the building surface refer to the decorations and doors and windows on the building surface.

6. The high-precision three-dimensional modeling method for urban buildings based on stereo satellites according to claim 1, characterized in that: In step S7, the length and width dimensions of each height on the initial model can be modified based on the obtained real-world image and the dimensions of each object on the building surface.

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