CN115222898A - Simplified map model creation method based on oblique photography and voxel modeling technology - Google Patents
Simplified map model creation method based on oblique photography and voxel modeling technology Download PDFInfo
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- CN115222898A CN115222898A CN202211147137.0A CN202211147137A CN115222898A CN 115222898 A CN115222898 A CN 115222898A CN 202211147137 A CN202211147137 A CN 202211147137A CN 115222898 A CN115222898 A CN 115222898A
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Abstract
The invention discloses a simplified map model establishing method based on oblique photography and voxel modeling technology, which comprises the following steps: establishing an initial oblique photography model and a voxel model based on the building three-dimensional model; deleting the overlapped surface and combining the homodromous common edge surfaces of the voxel model to obtain a simplified voxel model; adjusting the simplified voxel model and the initial oblique photography model to be coincident, and then deleting the initial oblique photography model to obtain a simplified model body; and (5) mapping the simplified model body to obtain a simplified mapping model. The method is based on oblique photography and voxel modeling technology, and utilizes the geometric characteristics of the voxel model to obviously reduce the number of voxel model surfaces under the condition of not changing the shape of the voxel model, and simultaneously can reduce mapping disorder and obtain better appearance effect. Most steps can be judged and automatically executed by a computer, so that the manual workload is reduced, and a new thought is provided for automatically simplifying the three-dimensional model of the building.
Description
Technical Field
The invention belongs to the technical field of building three-dimensional model creation, and particularly relates to a simplified map model creation method based on oblique photography and voxel modeling technologies.
Background
In the computer three-dimensional software, a three-dimensional model mainly comprises two parts of contents, namely a model grid and a chartlet, wherein the grid is a three-dimensional body, and the chartlet is a two-dimensional image. The model mesh provides a skeleton of a model shape in three-dimensional software, and the chartlet is attached to the surface of the model mesh to provide corresponding patterns and textures for the appearance of the model. In three-dimensional software, the corresponding relation between the appearance of the three-dimensional model and the chartlet can be understood as that the three-dimensional model grid is flattened on a plane after being cut off according to certain edges, and the effect of the chartlet on the outer vertical surface of the model is realized by corresponding the surface of the flattened model grid to a certain area of the chartlet. A three-dimensional model that produces an appearance effect according to this principle may be generally referred to as a chartlet model.
With the application and popularization of BIM and CIM technologies, the demand for integrating massive models in a three-dimensional visual platform of a building is increasing. Because the common BIM model is fine, the model grid is complex, the number of the triangular panels of the model is too many, if the model is directly used for a WEB end scene without simplified processing, the rendering pressure is high, and the platform is easy to be blocked and collapsed. Therefore, many platforms use a simplified mapping model to represent the urban scene.
The model is simplified, which is mainly embodied as the simplification of the model grid body, namely, the number of faces of the model is reduced, and the chartlet model manufactured by simplifying the grid can be called as a simplified chartlet model. Conventional modeling of a simplified map model requires manual creation of a simplified model shape and then drawing of an appearance map of the model. However, the manual modeling and mapping work has the problems of large workload, low modeling efficiency, poor achievement uniformity and the like. Currently, the technical means for automatically creating a three-dimensional model of a building are limited, and oblique photography is a common method.
Oblique photography (also known as image-based three-dimensional reconstruction) is a new technology developed in the field of mapping remote sensing in recent years. The technology mainly utilizes the unmanned aerial vehicle to take an aerial photograph of the ground buildings, obtains appearance images of a plurality of angles of a target object, then analyzes the images, and can obtain a three-dimensional model with appearance through aerial triangulation, triangulation network construction and automatic texture mapping. However, the conventional oblique photography model is automatically created with the following disadvantages: the model often has the problems of disordered shapes, floating objects, lost details and the like; the conventional oblique photography model has complex meshes, a large number of planes and a large volume of data.
In view of the above disadvantages, the solution provided by oblique photography software is manual mold trimming. In the mould repairing process, a spatial relationship (the aerial triangulation) is built by using a photo, an oblique photography model is automatically built, then a repaired model body is manually built at an original model, the automatically built oblique photography model body is deleted, and the model is subjected to rollback calculation based on the originally built spatial relationship to obtain the optimized oblique photography model. However, the traditional mold repairing process still has the problems of large workload, low modeling efficiency and poor result uniformity in manual model body creation.
For the automatic creation of model shapes, voxel modeling is a good technical means. Voxel modeling is based on the modeling idea of three-dimensional space rasterization, a specific unit space size is preset according to the scale of a model, and the occupation of the model is judged for each three-dimensional grid space, and if the model content (any point, line, surface and body of the model) exists, a cube with the same size is used for filling the whole grid space. Voxel modeling can quickly fit the morphology and the volume of the model. However, the following three disadvantages exist in creating a building model using voxel modeling:
1) The generated voxel model is composed of a large number of cubes, a large number of invisible overlapped surfaces exist in the voxel model, an external vertical surface is composed of a large number of squares, and if the voxel model is directly applied to a WEB page end WEB platform, grids are still too complex, so that the loading performance is influenced;
2) Voxel modeling can only be used for creating model bodies, and an external elevation map of a model cannot be directly drawn, so that the problem of loss of the appearance effect of the model exists;
3) Voxel modeling is a method of fitting an original model, and since the edges of a voxel square do not easily overlap the edges of the model volume completely, the size of the voxel model will generally be slightly larger than the original model. Therefore, the conventional map projection technology of three-dimensional software is applied to the voxel model, and a large amount of map disorder is easy to occur.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a simplified mapping model establishing method based on oblique photography and voxel modeling technologies, a virtual camera is used for shooting a building three-dimensional model image to simulate an unmanned aerial vehicle aerial photograph in reality, an oblique photography model is established, an original building three-dimensional model is converted into a voxel model, overlapped surface deletion and homodromous surface combination are utilized to obtain a simplified voxel model to replace a model used by the traditional manual die repair, and the simplified mapping model is finally obtained through a die repair process. The invention adopts the following specific technical scheme:
a simplified map model creation method based on oblique photography and voxel modeling technology comprises the following steps:
step S101, obtaining a building three-dimensional model;
step S102, a ground plane and a look-around path are created for the building three-dimensional model;
step S103, creating a virtual camera on the all-round looking path, and setting parameters of the virtual camera, wherein the virtual camera shoots at intervals along the all-round looking path according to the same or different angles to obtain an appearance image of the building three-dimensional model;
step S104, importing an appearance image of the building three-dimensional model and camera parameters, constructing a spatial relationship in oblique photography software, and creating an initial oblique photography model;
step S105, aiming at the imported building three-dimensional model, a voxel model is created;
step S106, deleting the voxel model overlapped surface to obtain a shell-extracting voxel model;
step S107, merging the homodromous common-edge surfaces of the shell voxel model to obtain a simplified voxel model;
step S108, importing the simplified voxel model into an initial oblique photography model, adjusting the simplified voxel model shape to be overlapped with the initial oblique photography model, and then deleting the initial oblique photography model to obtain a simplified model shape;
and step S109, mapping the final model by using the spatial relationship constructed in the step S104 to obtain a simplified mapping model.
Preferably, the ground plane takes the building three-dimensional model as a center, the looking-around path is positioned above the building three-dimensional model, and the radius of the looking-around path is larger than the distance from the center of the model to the edge in each direction.
Preferably, the creating of the voxel model comprises the following steps:
1) Setting the size of a voxel block;
2) And rasterizing the geometric space occupation of the building three-dimensional model, judging whether model content exists in each space body, and creating a cube in the cube space if the model content exists so as to generate a voxel model of the building three-dimensional model.
Preferably, the adjusting the simplified voxel model shape to coincide with the initial oblique photography model includes:
1) Measuring the size of the buildings and the size of the simplified voxel model body in the initial oblique photography model;
2) Adjusting the size of the simplified voxel model body to be consistent with the size of the initial oblique photography model;
3) Rotating and/or translating simplifies the positioning of the voxel model to the initial oblique phantom, bringing the two into registration.
Preferably, the step S106 includes the steps of:
1) Traversing and judging the overlapping surface condition of each cube of the voxel model and the adjacent cubes;
2) And deleting the mutually overlapped surfaces to obtain the extraction shell prime model.
Preferably, the simplified voxel model obtained in step S107 is operated as follows: all polygons of the simplified voxel model are converted into a more general triangular mesh.
The invention has the following beneficial effects:
(1) The invention can be suitable for the reconstruction work of building three-dimensional models with various formats and is not limited by the format and the production platform.
(2) The invention creates a panoramic path and a virtual camera to simulate the work flow of the traditional unmanned aerial vehicle oblique photography, and can create a three-dimensional model for the building which is not actually built.
(3) The invention can realize shell extraction of the traditional voxel model by using the geometric characteristics of the voxel model and judging the overlapped surface, thereby simplifying the grid shape of the traditional voxel model.
(4) The invention combines redundant squares by using the geometric characteristics and the face orientation characteristics of the voxel model, and obviously reduces the number of faces of the model body under the condition of not changing the model body.
(5) The invention executes the mould repairing process by utilizing the voxel modeling and the optimization technology based on the geometric characteristics of the voxel model, thereby avoiding the problem of manually establishing the model body.
(6) The invention solves the problems of black surface and flash surface which may exist in the process that the model simplifies the model form and generates the chartlet model by using the mesh triangulation.
(7) The invention utilizes oblique photography technology to map a voxel model with slightly larger size than the original model, and can reduce mapping disorder and obtain better appearance effect compared with the traditional three-dimensional texture projection.
(8) Most steps can be judged and automatically executed by a computer, so that the manual workload is reduced, and a new thought is provided for automatically simplifying the three-dimensional model of the building.
Drawings
Some specific embodiments of the invention will now be described in detail, by way of example and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily to scale. The objects and features of the present invention will become more apparent in view of the following description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a method of an embodiment of the present invention;
fig. 2 is a three-dimensional model of the building obtained in step S101 in the embodiment of the present invention;
fig. 3 is a schematic diagram of setting a look-around path and creating a virtual camera in step S102 and step S103 in the embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating the spatial relationship established in step S104 according to an embodiment of the present invention;
FIG. 5 is an external view of the initial oblique photography model created in step S104 according to the embodiment of the present invention;
fig. 6 is a voxel model map created according to the original building three-dimensional model in step S105 in the embodiment of the present invention;
FIG. 7 is a diagram illustrating the step S106 of deleting overlapped surfaces in the embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating the orientation of the surface of step S107 in the embodiment of the present invention;
FIG. 9 is a schematic diagram of the homodromous edge-face merging step S107 in the embodiment of the present invention;
fig. 10 is an appearance diagram of the simplified voxel model obtained in step S107 in the embodiment of the present invention;
FIG. 11 is an external view of the simplified model shape left after the simplified voxel model is imported into the oblique photography model in step S108, and the simplified model shape is superimposed and left after scaling, rotation and movement operations are illustrated;
FIG. 12 is a final simplified chartlet model appearance diagram in accordance with an embodiment of the present invention;
FIG. 13 is a schematic diagram of polygon triangulation in an embodiment of the invention;
fig. 14 is an appearance diagram of the simplified voxel model after the polygonal surface is triangulated in the embodiment of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this embodiment, a certain building model is taken as an example, an original building three-dimensional model is created by MicroStation software of a product of Bentley company, and Bentley ContextCapture is adopted as oblique photography modeling software.
Referring to fig. 1, an embodiment of the present invention provides a simplified map model creation method based on oblique photography and voxel modeling techniques, including the following steps:
and step S101, obtaining a building three-dimensional model.
The process is a process of creating or importing a three-dimensional model of an original building. In this embodiment, a three-dimensional software product MicroStation of Bentley corporation is used, and fig. 2 shows a building three-dimensional model of a certain building in MicroStation software. This step S101 is the creation or import of the original building three-dimensional model, which is the prior art.
And S102, taking the building three-dimensional model as a center, and creating a ground plane and a look-around path for the building three-dimensional model.
In this embodiment, a textured planar ground with a size several times that of the projection area of the three-dimensional building model is created with the three-dimensional building model obtained in step S101 as the center, and a look-around path is created. The circular viewing path is a circular path and can be determined according to the overall geometry of the building, for example, the circular viewing path is set to be circular or elliptical according to the overall outline of the building base, the circular viewing path is used for a square building base, and the elliptical viewing path is used for a long building base. In order to collect the appearance image of the top of the building, the all-round path is positioned above the building three-dimensional model. As shown in fig. 3, the center of the looking-around path of the present embodiment is located above the center point of the building plane, the height of the path is higher than the height of the building, and the radius of the path is larger than the dimension from the center to the edge of the model in each direction, so as to ensure that the viewing field of each point on the path can encompass the whole building model. As shown in fig. 3, an elliptical look-around path is created for this embodiment.
It should be noted that for complex buildings or building models requiring finer appearance effect, the look-around path with other height may be added, the height of the added look-around path may be lower than the building height, and other technical descriptions of the added path are consistent with the first look-around path.
And step S103, creating a virtual camera on the all-round looking path, setting camera parameters, and shooting along the all-round looking path to obtain an appearance image of the building three-dimensional model.
And step S102, setting a camera on each all-round looking path set in the step S, wherein the observing direction of the virtual camera always faces to the central point of the three-dimensional model of the building. And setting parameters of focal lengths and sensor sizes of all the cameras, setting the focal lengths of all the cameras to be the same value, and setting the sensor sizes of all the cameras to be the same value. The virtual camera field of view may encompass the entire architectural three-dimensional model. The virtual cameras move step by step along the looking-around path according to a certain angle or distance, an appearance image of the building three-dimensional model is shot after each step of movement, and each camera surrounds the looking-around path for a circle. To ensure the quality of the mapping of the final model, the maximum angular separation between adjacent images is preferably not too large, preferably not more than 10 °. In this embodiment, when the virtual camera moves step by step, one picture can be taken at 4 ° of rotation per revolution, and 90 building three-dimensional model appearance images are generated in total by surrounding one circle. The virtual camera may capture images along the looking-around path at different angular intervals, or may make a round trip for more images.
And step S104, importing the appearance image of the building three-dimensional model and the camera parameters, constructing a spatial relationship in oblique photography software, and creating an initial building oblique photography model.
And (4) importing all the appearance images of the three-dimensional building model obtained in the step (S103), the focal length of the camera and the size parameters of the sensor into oblique photography software for automatic modeling. Software can utilize the appearance image of the building three-dimensional model to construct a virtual space, the spatial relationship between the image and an expected model is obtained through calculation and analysis, and an oblique photography model is created through a three-dimensional reconstruction technology. Step S104 is performed by using conventional oblique photography modeling software, which is not described herein for the prior art.
In this embodiment, oblique photography modeling software adopts ContextCapture of Bentley corporation, introduces all building three-dimensional model appearance images obtained in step S103 into the ContextCapture, and inputs the focal length and sensor size parameters of the camera in step S103, and the software automatically calculates to obtain the spatial relationship between the image and the expected model through spatial analysis, as shown in fig. 4. An initial architectural oblique photography model is then automatically generated, as shown in FIG. 5. In this embodiment, the model modification software used subsequently is also ContextCapture of Bentley company, and in order to ensure that the model can be modified subsequently, the generation option of the architectural oblique photography model in step S104 is 3D mesh for remoting, the model output format is xgn, and the other parameters are set by default.
To this end, the present embodiment has completed the initial creation of the oblique photography model, and then the model modification process needs to be executed, and the model shape needs to be created in the subsequent steps S105, S106, and S107, in order to create the model shape by using the voxel modeling and optimization technique.
In step S105, a voxel model is created for the imported three-dimensional model of the building.
The building three-dimensional model obtained in step S101 is generated into a voxel model using a voxel modeling tool. In this embodiment, the building three-dimensional model obtained in step S101 is introduced into the MicroStation software, a voxel modeling tool is used to set the voxel block size, the geometric space occupation of the model is rasterized, whether model content exists in each space is determined, if the content exists, a cube is created in the cube space, and then a voxel model corresponding to the building three-dimensional model is generated, as shown in fig. 6. The model content refers to any point, line, face and body of the three-dimensional model, and when the voxel model is created, the cube is filled as long as any point, line, face and body of the model exists in the cube space.
This embodiment, modeled using a voxel modeling tool, may set the voxel block size to 50cm and the cube size created by the space with model content to 50cm x 50cm. It should be noted that the present step S105 of creating the voxel model may adopt the prior art.
And S106, deleting the voxel model overlapped surface to obtain a shell-extracting voxel model.
And traversing and judging the condition of the overlapped surface of each cube and the adjacent cube, deleting the two overlapped square surfaces, and obtaining the voxel model after shell extraction, wherein the shell extraction voxel model can be called. Since the voxel model generated in step S105 is formed by stacking a large number of cubes, two adjacent cubes have mutually overlapping faces, and these faces are all located inside the voxel model, are faces invisible in appearance, belong to redundant content, and need to be deleted to simplify the model. As shown in fig. 7 (a), the gray regions are the overlapped square faces, and are all deleted, so as to obtain the hull-extracted voxel model shown in fig. 7 (b). The decimated voxel model obtained after step S106 will not contain any overlapping surfaces.
And S107, merging the homodromous common-edge surfaces of the shell-extracting voxel model to obtain a simplified voxel model.
The homodromous common side faces refer to faces which are oriented the same and have common sides. In this embodiment, a certain orientation is specified, all the surfaces of the hull-extracted voxel model obtained in step S106 are traversed, the square surfaces of the orientation are selected for merging, and the merging rule is that a common edge exists, that is, merging. The orientation of the faces refers to the outward pointing normal of the mold faces, as shown in fig. 8. A co-planar merge is then performed once each for the other five orientations. Since all the voxel models generated in step S105 are stacked from cubes, all the faces of the whole voxel model have only six orientations, and after performing edge-sharing face combination on the six orientations, a simplified voxel model, called a simplified voxel model, can be obtained.
Taking the forward-facing surface in fig. 9 (a) as an example, all the forward-facing square surfaces are selected as the same-direction surfaces. If there is a common edge between these square surfaces and the adjacent square surfaces, the two adjacent surfaces merge, and the common edge disappears, forming a collection of surfaces, as shown in fig. 9 (b). Fig. 9 (c) shows that the co-edge plane merging operation is performed on all six oriented planes, and a simplified voxel model is obtained, as shown in fig. 9 (d). The purpose of this step S107 is to simplify the model by merging the common-edge planes in the same orientation to reduce the number of model planes.
In this embodiment, after the operations of deleting overlapped surfaces in step S106 and merging co-directional co-boundary surfaces in step S107, the building voxel model shown in fig. 6 is changed into a simplified voxel model shown in fig. 10.
In step S107, the simplified voxel model is constructed, but due to the characteristics of voxel model generation, the model is only a shape and has no building facade appearance effect, and in the subsequent steps, a facade map is created for the simplified voxel model by using a mold trimming process of oblique photography.
Step S108, the simplified voxel model is imported into an initial oblique photography model, the simplified voxel model is adjusted by referring to the size and the position of the initial oblique photography model, the simplified voxel model is overlapped with the initial oblique photography model, and then the initial oblique photography model is deleted to obtain a simplified model body.
In this embodiment, using the MicroStation software, an initial oblique photography model × dgn file is opened, and the simplified voxel model created in step S107 is imported into the MicroStation software. Referring to the initial oblique photography model, the simplified voxel model and the initial oblique photography model are adjusted to coincide as follows:
1) Measuring the length, width and height dimensions of the buildings in the initial oblique photography model and the length, width and height dimensions of the buildings in the simplified voxel model body;
2) Taking the length, width and height of a building in the initial oblique photography model as reference, and scaling the size of the simplified voxel model to make the size of the simplified voxel model consistent with the size of the initial oblique photography model;
3) The reduced voxel model volume after size scaling is rotated and/or translated to coincide with the position of the initial oblique photography model.
After the models are overlapped, the initial oblique photography model is deleted, a simplified voxel model after zooming, rotating and translating is left and called as a simplified model body, and the format of a model file is stored as x.
In this embodiment, the MicroStation software is used to perform operations such as rotation and/or translation of the simplified voxel model with the size of the model adjusted, with reference to the position of the initial oblique photography model, and then the shape of the simplified voxel model is made to coincide with the position of the initial oblique photography building. Fig. 11 (a) is a schematic diagram showing the scaling of the simplified voxel model, fig. 11 (b) is a schematic diagram showing the rotation of the scaled simplified voxel model, fig. 11 (c) is a schematic diagram showing the translation of the scaled and rotated simplified voxel model, and fig. 11 (d) is a state where the scaled, rotated, translated simplified voxel model and the initial oblique tomographic model are superimposed. It should be noted that the simplified voxel model surface is a smooth and flat surface, the oblique photography model surface has protrusions due to the uneven structure of the building surface, and when the two models are superposed, the protrusions of the oblique photography model surface protrude from the simplified model surface.
In this embodiment, the original oblique photography model (including the ground and the floating objects) is deleted using a deletion tool, resulting in a simplified model shape, which is saved as a × dgn file, as shown in fig. 11 (e).
In the subsequent trimming process, the oblique photography software performs texture re-projection on the simplified model shape in the newly imported star-dgn file. To ensure that the model map is not distracted, the simplified model shape should coincide with the size and position of the building in the original oblique photography model. Because the software will assign a map to the model shapes in the final dgn file, the original oblique photography model shapes become redundant after the simplified model shapes are adjusted in size and position, and should be deleted.
And step S109, in oblique photography software, mapping the simplified model form by using the spatial relationship established in step S104 to obtain a simplified mapping model.
In this embodiment, the simplified model shape in step S108 is imported into oblique photography software, and the final simplified chartlet model is obtained by using the spatial relationship established in step S104 and automatic rollback calculation by the software. In this embodiment, the template modification workflow still uses oblique photography software ContextCapture, and based on the spatial relationship that has been constructed in step S104, maps the simplified model shape through the spatial relationship, and draws a pattern matching the spatial relationship onto the simplified model shape to obtain a simplified map model.
More specifically, in this embodiment, an import stops tool in the ContextCapture software is used, the xgn file stored in step S108 is imported, rollback calculation is performed on the model in the ContextCapture software, the map is redrawn, and a new xgn format model is generated, where the model is the final simplified map model of the building, as shown in fig. 12.
It should be noted that, in the simplified voxel model obtained in step S107 of the present embodiment, since many faces are merged from squares, there are usually a large number of N-sided polygons (N ≧ 4), and these polygons are prone to generate interferences such as black faces and flash faces in the process of generating the map model from the simplified model shape. To reduce interference, the present embodiment may triangulate all polygon surfaces of the simplified voxel model, converting the polygons into a more general triangular mesh. As shown in fig. 13, (a) in fig. 13 is an octagon plane in the simplified voxel model, and (b) in fig. 13 is a schematic diagram of six triangulated triangular meshes. As shown in fig. 14, a model mesh diagram is obtained by triangulating the simplified voxel model shown in fig. 10.
It should be understood that the embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above without departing from the inventive concept of the present invention, and therefore the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the inventive features set forth in the claims.
Claims (6)
1. A simplified map model creation method based on oblique photography and voxel modeling technology is characterized by comprising the following steps:
step S101, obtaining a building three-dimensional model;
step S102, a ground plane and a look-around path are created for the building three-dimensional model;
step S103, creating a virtual camera on the all-round looking path, and setting parameters of the virtual camera, wherein the virtual camera shoots at intervals along the all-round looking path according to the same or different angles to obtain an appearance image of the building three-dimensional model;
step S104, importing an appearance image of the building three-dimensional model and camera parameters, constructing a spatial relationship in oblique photography software, and creating an initial oblique photography model;
step S105, aiming at the imported building three-dimensional model, a voxel model is created;
step S106, deleting the overlapping surface of the voxel model to obtain a shell-drawing voxel model;
step S107, merging the homodromous common-edge surfaces of the shell voxel model to obtain a simplified voxel model;
step S108, importing the simplified voxel model into an initial oblique photography model, adjusting the simplified voxel model shape to be overlapped with the initial oblique photography model, and then deleting the initial oblique photography model to obtain a simplified model shape;
and step S109, mapping the final model by using the spatial relationship constructed in the step S104 to obtain a simplified mapping model.
2. The method of claim 1, wherein the ground plane is centered on the building three-dimensional model, the look-around path is above the building three-dimensional model, and the radius of the look-around path is greater than the distance from the center to the edge of the model in each direction.
3. The method of simplified map model creation based on oblique photography and voxel modeling techniques of claim 1, wherein the creation of a voxel model comprises the steps of:
1) Setting the size of a voxel block;
2) And rasterizing the geometric space occupation of the building three-dimensional model, judging whether model content exists in each space body, and creating a cube in the cube space if the model content exists so as to generate a voxel model of the building three-dimensional model.
4. The method of simplified map model creation based on oblique photography and voxel modeling techniques of claim 1, wherein said adjusting the simplified voxel model shape to coincide with the initial oblique photography model comprises the steps of:
1) Measuring the size of a building in the initial oblique photography model and the size of a simplified voxel model body;
2) Adjusting the size of the simplified voxel model body to be consistent with the size of the initial oblique photography model;
3) Rotating and/or translating simplifies the positioning of the voxel model to the initial oblique phantom, bringing the two into registration.
5. The method for creating a simplified map model based on oblique photography and voxel modeling techniques according to claim 1, wherein said step S106 comprises the steps of:
1) Traversing and judging the overlapping surface condition of each cube of the voxel model and the adjacent cubes;
2) And deleting the mutually overlapped surfaces to obtain the extraction shell prime model.
6. The method for creating a simplified map model based on oblique photography and voxel modeling techniques according to claim 1, characterized in that the simplified voxel model obtained in step S107 is subjected to the following operations: all polygons of the simplified voxel model are converted into a more general triangular mesh.
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