CN111737790A - Method and equipment for constructing simulated city model - Google Patents
Method and equipment for constructing simulated city model Download PDFInfo
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Abstract
The invention discloses a method and equipment for constructing a simulated city model, and relates to the field of simulation modeling. The construction method of the simulation city model comprises the following steps: fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system; and fusing the simulation building model and the earth surface model to obtain a simulation city model. The method is used for solving the problems that the traditional three-dimensional modeling method cannot simply, effectively and really restore the real scene environment of the city and cannot realize the indoor and outdoor effective fusion modeling of the building.
Description
Technical Field
The invention relates to the field of simulation modeling, in particular to a method and equipment for constructing a simulation city model.
Background
City action generally refers to an action directed toward defending or capturing a city. The city action unit is an action style, and has the distinct characteristics of extremely complex battlefield environment, limited equipment advantage exertion, violent competition for buildings and the like. The wide application of various simulation training systems taking virtual reality technology and the like as the core is a prominent feature of urban action training of military forces in many developed countries at present. The battlefield environment simulation is an indispensable important link, and can truly and rapidly provide virtual battlefield environment and battlefield situation for a commander, so that the efficiency of action command is improved unprecedentedly.
The acquisition and modeling of three-dimensional building information are the main content of city modeling. And adding a three-dimensional building model on the virtual earth surface model to form a complete three-dimensional city model. At present, three-dimensional building modeling researches mainly comprise: 1) automatically extracting a building from the urban image, and directly performing surface modeling on the building by combining a two-dimensional building vector and DSM (digital surface model) data; 2) constructing a polyhedral object model by image measurement and combining with the geometric knowledge of an object; 3) the ground and vehicle-mounted laser scanning system is used for three-dimensional city reconstruction and local area space information acquisition; 4) a three-dimensional reconstruction method based on an airborne laser scanning system; 5) building modeling is achieved by using data acquired by a three-dimensional depth sensor, a plurality of CCD cameras and a color high-resolution digital camera; 6) and the visualization of the three-dimensional GIS data is realized by utilizing a virtual reality technology.
In the method, the difference between the battlefield environment constructed by depending on the geographic environment vector and the attribute data and the real environment is large, and the urban real-scene environment cannot be really restored; three-dimensional reconstruction methods based on laser scanning and the like have the disadvantages of high production cost, high working strength, uncertain model production effect and the like; the existing virtual environment simulation modeling method can not realize building indoor and outdoor fusion modeling while ensuring the space consistency of the building.
Disclosure of Invention
The invention provides a method and equipment for constructing a simulated city model, which are used for solving the problems that the conventional three-dimensional modeling method cannot simply, effectively and really restore the real-scene environment of a city and cannot realize the indoor and outdoor effective fusion modeling of a building.
In order to achieve the purpose, the invention provides the following technical scheme:
in a first aspect, the present invention provides a method for constructing a simulated city model, including:
fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and fusing the simulation building model and the earth surface model to obtain a simulation city model.
The earth model includes contents such as ground elevation information, road coordinate information, water system coordinate information, vegetation coordinate information and the like, but does not include building information.
The method for constructing the simulated city model is based on oblique photogrammetry and BIM modeling, the method adopts oblique photogrammetry technology to complete the establishment of the city outdoor live-action model, utilizes a BIM data modeling method to complete the building indoor modeling, and completes the fusion of the building outdoor model and the building indoor model through the data exchange of the outdoor model and the indoor model, thereby greatly improving the modeling speed while ensuring the space consistency of the virtual environment. In addition, the construction method has low production cost, low working strength and low difference between the battlefield environment and the real environment, and can truly restore the urban real-scene environment.
In one embodiment of the present invention, obtaining an outdoor model of a building using an oblique photogrammetry technique comprises:
acquiring a remote sensing image of the unmanned aerial vehicle by using the unmanned aerial vehicle;
carrying out data processing on the obtained unmanned aerial vehicle remote sensing image to obtain influence data;
carrying out aerial triangulation according to the image data to obtain control point data;
and establishing a three-dimensional outdoor model according to the control point data, and performing texture modification treatment to obtain the outdoor model.
In one embodiment of the present invention, the building of the indoor model using the BIM includes the following steps:
obtaining a digital earth surface model of the building according to the outdoor model;
and constructing an indoor model on the digital earth surface model according to the construction information of the building.
The building information of the building includes, for example, building level height, internal wall position, pipe network information, and the like.
In one embodiment, the fusing the outdoor model of the building obtained by oblique photogrammetry and the indoor model of the building constructed by BIM to obtain the simulated building model comprises:
establishing a coordinate system based on the coordinate data of the outdoor model, and taking an outdoor building feature point in the outdoor model as an origin of the coordinate system;
calculating relative coordinates of a plurality of indoor building characteristic points and the outdoor building characteristic points in the indoor model;
and adjusting the position of the indoor model in the coordinate system according to the relative coordinates to realize the fusion of the outdoor model and the indoor model, so as to obtain the simulated building model.
In an embodiment of the present invention, the fusing the simulation building model and the surface model to obtain a simulation city model includes:
performing monomer processing on the simulation building model to obtain bottom surface vector parameters of the building;
acquiring a digital elevation model of the simulation building model;
and fusing the bottom surface of the simulation building model with the ground of the earth surface model according to the bottom surface vector parameters, and fusing the digital elevation model with the earth surface model to obtain the simulation city model.
The method comprises the steps of performing singulation processing, namely splitting a building group into single buildings, separating the wall surface of each single building from the ground, obtaining bottom surface vector parameters of the buildings and digital elevation models of the walls after separation, further refining the bottom surface information of the buildings through singulation so as to be better matched with a ground surface model, and then fusing the digital elevation models of the buildings and the positions, corresponding to the bottom surfaces of the buildings, in the ground surface model so as to obtain a simulated city model. Through the splitting, the integration precision of the simulation building model and the earth surface model is higher.
In an embodiment of the present invention, after the unitization processing is performed on the simulation building model to obtain the bottom surface vector parameters of the building, and before the digital elevation model and the surface model are fused to obtain the simulation city model, the method further includes:
and modifying the surface of the simulation building model by utilizing an automatic texture mapping technology.
By modifying the abnormal textures, the fusion difference of the outdoor model and the indoor model is reduced, and the attractiveness of the simulation building model is improved. Meanwhile, the abnormal wall surface of the simulation building model can be corrected, the structure of the simulation building model can be refined, and the attractiveness of the simulation building model can be improved.
In a second aspect, the present invention provides a simulation city model building apparatus, including: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of:
fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and fusing the simulation building model and the earth surface model to obtain a simulation city model.
In an embodiment of the present invention, the apparatus is specifically configured to implement the fusion of the outdoor model and the indoor model by:
establishing a coordinate system based on the coordinate data of the outdoor model, and taking an outdoor building feature point in the outdoor model as an origin of the coordinate system;
calculating relative coordinates of a plurality of indoor building characteristic points and the outdoor building characteristic points in the indoor model;
and adjusting the position of the indoor model in the coordinate system according to the relative coordinates to realize the fusion of the outdoor model and the indoor model, so as to obtain the simulated building model.
In an embodiment of the present invention, the apparatus is specifically configured to implement the fusion of the simulated architectural model and the surface model by:
performing monomer processing on the simulation building model to obtain bottom surface vector parameters of the building;
acquiring a digital elevation model of the simulation building model;
and fusing the bottom surface of the simulation building model with the ground of the earth surface model according to the bottom surface vector parameters, and fusing the digital elevation model with the earth surface model to obtain the simulation city model.
In an embodiment of the present invention, the apparatus is specifically configured to, after the unitization processing is performed on the simulation building model to obtain bottom surface vector parameters of the building, before the digital elevation model and the surface model are fused to obtain the simulation city model, further include:
and modifying the surface of the simulation building model by utilizing an automatic texture mapping technology.
In one embodiment of the invention, the apparatus is particularly adapted to construct an indoor model of the building by:
obtaining a digital earth surface model of the building according to the outdoor model;
and constructing an indoor model on the digital earth surface model according to the construction information of the building.
Drawings
Fig. 1 is a schematic flow structure diagram of a method for constructing a simulated city model according to an embodiment of the present invention;
fig. 2 is a schematic view of a flow structure for obtaining an outdoor model of a building by using an oblique photogrammetry technique according to an embodiment of the present invention;
FIG. 3 is a 3D MESh model diagram constructed by ContextCapture according to an embodiment of the present invention;
fig. 4 is a schematic flow structure diagram of building an indoor model of an urban building based on the BIM technology according to an embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a method for fusing an outdoor model and an indoor model of a building according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart diagram illustrating a method for fusing a simulation building model with a surface model according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a simulated city model according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a simulation city model building device according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a simulation city model building apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the 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.
The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems. In the description of the present invention, the term "plurality" means two or more unless otherwise specified.
The method for constructing the simulated city model in the embodiment of the invention, as shown in fig. 1, comprises the following steps:
step S10, performing three-dimensional reconstruction of the urban outdoor building based on oblique photogrammetry technology to obtain an outdoor model of the building;
step S20, acquiring an indoor model of the urban building based on the BIM technology;
s30, fusing an outdoor model and an indoor model of the building to obtain an indoor and outdoor fused three-dimensional simulation building model;
s40, fusing the simulation building model and the earth surface model to obtain a simulation city model; the earth surface model comprises contents such as ground elevation information, road coordinate information, water system coordinate information, vegetation coordinate information and the like, but does not comprise building information.
As shown in fig. 2, the step of obtaining the outdoor model of the building by using the oblique photogrammetry technique in step S10 includes the following steps:
s101, obtaining a remote sensing image of the unmanned aerial vehicle
The quality of building a three-dimensional model of a city based on oblique photogrammetry depends to a large extent on the quality of the data acquisition. The acquisition of the remote sensing image of the unmanned aerial vehicle mainly comprises four steps of camera calibration, air route planning, image control point measurement and unmanned aerial vehicle aerial survey. Wherein the camera is calibrated as: in the image measuring process and machine vision application, in order to determine the mutual relation between the three-dimensional geometric position of a certain point on the surface of a space object and the corresponding point in an image, a geometric model of camera imaging needs to be established, and the geometric model parameters are camera parameters; under most conditions, the parameters must be obtained through experiments and calculation, and the process of solving the parameters is called camera calibration (or video camera calibration).
Step S102, data preprocessing
The data preprocessing is mainly prepared for outdoor modeling, and comprises image dodging processing and POS (position and orientation system) data acquisition.
The images acquired by the unmanned aerial vehicle generally have color imbalance between the same photo or different photos due to the influence of factors such as illumination change, different sensors, different acquisition time and the like. In order to ensure the consistent light color of aerial photo, the photo needs to be uniformly processed.
The POS data is the corresponding position and attitude data of the image acquired by the unmanned aerial vehicle, and the format of the data is related to the specific unmanned aerial vehicle. POS data directly written in the image can be directly read by general post modeling software, POS files and the image need to be independently input into the post modeling software, and the POS files and the image need to be converted into image control point data files in a fixed format by utilizing unmanned aerial vehicle random software.
Step S103, aerial triangulation and control point calculation
The essence of the aerial triangulation in the method is that coordinates of an external orientation element and an encryption point of an image are obtained by measuring coordinates of image points in an image overlapping area, combining coordinates of field image control points and resolving according to a set relation between the image and a shot ground object. The process mainly adopts an image control point image correlation and aerial triangulation integrated method, the method can avoid the problem of overlarge workload for establishing the correlation files of all image control points and most images, and can also reduce the pricking point difficulty while ensuring the precision.
According to the method, firstly, aerial triangulation in any scale and direction is carried out without adding image control points, and field data results can be preliminarily checked. And then selecting 3 image control points from all the image control points, selecting 2 images with clear corresponding image control points for each image control point, completing the association between the image control points and the images, performing aerial triangulation under non-fixed control points, then performing accurate association, ensuring that at least 3 continuous image puncture points of each lens and 3 photos of each control point, and completing the aerial triangulation under the fixed control points. And finally, refining the pricking points according to the adjustment result, and performing aerial triangulation again until all the control points meet the precision requirement.
Step S104, three-dimensional outdoor model building
After the control point data is obtained, 3D model building can be performed. By using an image dense matching scheme provided by a ContextCapture platform, reconstruction of a point cloud Digital Surface Model (DSM) with ultrahigh density is performed on an image, and meanwhile, parallel GPU acceleration is performed, so that efficiency is greatly improved, as shown in fig. 3.
Step S105, texture matching and refinement
Texture matching and refinement are techniques for adding a satellite map to the surface of a three-dimensional model, and can provide abundant surface detail information without increasing the complexity of the surface of an object. And matching corresponding image data on the ultrahigh-density point cloud Digital Surface Model (DSM) by utilizing a full-automatic texture mapping technology to form a more real three-dimensional building model.
In addition, a three-dimensional model built by using related software (such as ContextCapture) based on images of oblique photogrammetry often causes problems of model adhesion, texture loss and the like due to insufficient near-surface images, and can be repaired and refined by using DpModeler modeling software.
As shown in fig. 4, the building of the indoor model of the urban building based on the BIM technique in step S20 includes the following steps:
step S201, building site and site component building
The arrangement of the building site is related to factors such as building terraces, terrain surfaces and the like. The setting of the topographic surface in Revit (a BIM modeling software) can be established by means of importing CAD contours, or by reading elevation files.
In the embodiment of the invention, DSM (Digital surface model) information is extracted in the process of creating the outdoor model and is imported into a CAD file to form a corresponding contour map, and the destination surface information can be obtained in Revit.
Step S202, building elevation and axle network
The positioning information in the building is determined by the axis network and the elevation. The axis network functions as a coordinate system for each plane, and the elevation corresponds to the height of the building plane. In Revit, the elevation and the axis network jointly form a grid positioning system, which is the foundation for later-stage component establishment. Typically one floor level per elevation in a building. When the general BIM data model is imported into Revit, the elevation part is displayed normally without reconstruction, and if the elevation line is too long and inconvenient to observe, the length of the elevation line is adjusted horizontally through the elevation view.
The elevation and the axis network, and the internal wall structure, the pipeline structure, and the like in the following design can be obtained from data (for example, drawing information, design electronic document information, and the like) during building construction, and can also be obtained by measurement.
Step S203, structural design
When the BIM model is established, the required types are selected from different families according to the requirements, and the parameters of the types are adjusted to meet the requirements. The walls involved in the manufacturing process are of three types, namely basic walls, laminated walls and curtain walls, different families are called, and drawing is carried out after parameters are set. Except the wall body, the structural composition of the model also comprises columns, beams, floor slabs and the like, the columns, the beams, the floor slabs and the like are the same as the wall, corresponding families are called respectively, and the corresponding families are drawn to the designated positions according to the drawing.
Step S204, modeling of pipe network
The pipeline construction needs to rebuild the template, call the mechanical template, and then call the pipeline template in the system tab for drawing.
A pipeline is drawn by utilizing Revit modeling software, and the three steps of selecting a system, selecting pipe diameters (materials, pipe fittings and the like) and determining the height are totally included. Clicking the type of the system selected below the pipeline attribute column to be 'circulating water supply', then clicking the editing type, selecting 'pipe distribution system configuration', setting the pipe fittings, the size range and the pipe fitting types of the common pipeline, and drawing the components of elbows, tees and the like of the pipeline for the mechanical sample plate. After the simple drawing is finished, the height and the pipe diameter of the pipeline can be changed according to project requirements, the specific operation is that the pipeline is clicked to be highlighted, the mouse moves to the tail end of the pipeline, the 'drawing pipeline' is clicked in a right-click mode, the pipe diameter and the height are input again, then drawing is continued, and the pipeline generates a vertical pipe by clicking a three-dimensional view. After the pipeline is drawn, the pipelines of different systems can be distinguished according to specific requirements, and material colors and the like are added.
Step S205, building internal member modeling
Building interior components include indoor objects, and building interior structural modeling generally classifies indoor interior components into two categories, furniture decoration and office equipment. Wherein the furniture is decorated with: televisions, refrigerators, water dispensers, aquariums, bonsais, cabinets, and the like; office equipment includes: desks, office chairs, conference tables, etc. The general shape of indoor member is all too little regular, and is not of uniform size, and is complicated various, can carry out quick modeling through the clan file that software provided, also can make the physical model according to the demand size in addition.
Step S206, rendering of three-dimensional model
And completing model establishment in Revit, and rendering the model under a three-dimensional view to obtain a visualization effect. The detailed degree of the model display is set to be 'fine', and the rendering effect is set to be optimal. And obtaining the indoor model of the building after the rendering is finished.
The indoor model may be constructed based on a BIM model during building construction, or may be constructed based on various drawing data during building construction.
As shown in fig. 5, the process of fusing the outdoor model and the indoor model of the building in step S30 is as follows:
step S301, preliminarily fusing the outdoor model and the indoor model
Selecting an outdoor building characteristic point P on a three-dimensional outdoor model of the building obtained by oblique photogrammetry as an origin of a relative coordinate system, importing the three-dimensional outdoor model into 3D Max software, and simultaneously adjusting the position of the model to enable the outdoor building characteristic point P to coincide with the origin of the coordinate system.
Selecting an indoor model obtained based on BIM modeling, calculating to obtain relative coordinates of a plurality of indoor building characteristic points of the indoor model relative to an outdoor building characteristic point P, importing the indoor model into 3D Max software, and adjusting the position according to the relative coordinates to enable the indoor model to be approximately consistent with the outdoor model in space.
And adjusting attitude parameters (Rotation) and proportional parameters (Scale) of the indoor models by using 3D Max software to ensure that the indoor models are fused with the outdoor models consistently, completing the fusion of the outdoor models and the indoor models of all buildings in sequence, and merging and deriving the fused simulation building models into fbx format.
Step S302, unitization processing of simulation building model
The method is characterized in that the wall of the simulation building model is separated from the earth surface where the simulation building model is located, and each bottom surface vector information and wall surface vector information of each simulation building model are obtained independently. By means of the single processing of the simulation building model, more accurate vector information of the outdoor building model can be obtained, so that the outdoor model and the indoor model are further refined and fused, and a better fusion effect is obtained. In this embodiment, DpModeler and 3DMax can be used in linkage to make the simulation building model single. The method specifically comprises the following steps:
step S302a, loading the preliminarily fused simulation building model by utilizing DpModeler and 3DMax linkage plug-in; collecting building feature points needing to be individualized in the DpModeler, scattering the outdoor model to obtain each wall surface vector parameter, and simultaneously obtaining the bottom surface vector parameter of the building;
the wall surface vector information is acquired in the following mode: and drawing the wall surface characteristic points of each individualized building model in sequence, and converting the wall surface characteristic points into closed surface vector parameters by using DpModeler. The bottom surface vector parameters of the building are obtained by the following method: bottom surface feature points of each individualized building model are drawn in turn and converted into closed surface vectors using DpModeler. And respectively exporting the wall surface vector parameters and the bottom surface vector parameters after finishing the wall surface vector parameters and the bottom surface vector parameters.
Step S302b, calling a wall surface vector information correction model in 3DMax, and adjusting the wall surface position of the outdoor model to accurately fuse the indoor model and the outdoor model;
step S302c, performing structure refinement on the model in 3DMax, and modifying special different surfaces;
step S302d, utilizing DpModeler and 3DMax linkage plug-in to complete automatic mapping of texture, and checking and modifying abnormal texture.
As shown in fig. 6, the step of fusing the simulation building model and the surface model in step S40 is as follows:
step S401, constructing a surface model
And acquiring necessary vector information of the earth surface model according to the urban three-dimensional reconstruction requirement and the fused urban model, wherein the vector information of the earth surface model comprises ground elevation information, road coordinate information, water system coordinate information, vegetation coordinate information and the like.
The method comprises the following steps of constructing the ground by using a VBS3 military simulation engine according to ground elevation information; constructing rivers and lakes according to the water system vector information; constructing a road network model according to the vector information such as road coordinates and the like and the road material of the fusion model; and constructing vegetation models such as gardens, forest lands and the like according to the vegetation vector information.
Step S402, extracting a digital elevation model
Selecting earth surface elevation points in the earth surface of the simulation building model at certain sampling intervals, and establishing a triangulation network according to the selected elevation points and generating a digital elevation model;
step S403, fusing the simulation building model and the earth surface model
The VBS3 military simulation engine calls the bottom surface vector information obtained in the step S302a, simultaneously calls the data of the ground surface model, and positions the simulation building model to the specific position of the ground surface model; the VBS3 military simulation engine retrieves the digital elevation model obtained in step S402 and fuses it with the surface model. The method can extract models and vector information of some special structures, such as advertising boards, plants, power poles, communication poles and other structure information, according to requirements, and integrate the information into a ground model, and set information such as ground surface attributes and texture parameters to generate a simulated city model. The resulting simulated city model is shown in FIG. 7.
According to the embodiment of the invention, a VBS3 military simulation engine is adopted to complete urban three-dimensional modeling, surface simulation attributes (such as friction coefficient, adhesion coefficient, mud degree, elastic coefficient and the like) need to be added in the process of establishing the three-dimensional surface model by the VBS3 simulation platform, vector information extraction and model monomer operation need to be carried out on the fused simulation building model according to the input requirement of the VBS3 simulation platform, and then the construction of the simulation urban model is completed by the VBS3 military simulation engine.
It should be noted that, in this embodiment, each data processing and data conversion is as follows:
at present, three-dimensional live-action models obtained based on oblique photogrammetry widely adopt an OSGB data format so as to facilitate data exchange and rapid visualization of three-dimensional scene data. The general output format of the urban building indoor model generated by means of Revit based on BIM is FBX, and data formats such as IFC and RVT may also be output. The FBX format is a free format which can be used for cross-platform data exchange and is provided for a C + + software development platform and an API toolkit for users to read and write. OSGB is a default format for OSG, and can be directly loaded by OSG. The indoor model established by the Revit software can optimize textures through 3DMax, and the 3DMax model can be converted into an OSGB file by using a plug-in osgExp of the 3DMax, and then can be loaded by an OSG. The fusion of the outdoor model obtained by oblique photogrammetry and the indoor model obtained by BIM modeling is key in the embodiment of the invention, firstly, the sizes and the central coordinates of the outdoor model and the indoor model are acquired by a radius function and a center function in a Boundingsphere class in OSG, and then, the sizes and the positions are adjusted by a setScale function and a setPotPosititedTransform class so as to ensure the consistency of the positions and the sizes of the indoor model and the outdoor model. Thus, the data fusion of the outdoor model based on oblique photogrammetry and the indoor model based on BIM is completed.
Based on the same inventive concept, an embodiment of the present invention provides a device for constructing a simulated city model, as shown in fig. 8, including: a processor 81 and a memory 82, wherein the memory 82 stores program code that, when executed by the processor 81, causes the processor 81 to perform the steps of:
fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and fusing the simulation building model and the earth surface model to obtain a simulation city model.
In an embodiment of the present invention, the apparatus is specifically configured to implement the fusion of the outdoor model and the indoor model by:
establishing a coordinate system based on the coordinate data of the outdoor model, and taking an outdoor building feature point in the outdoor model as an origin of the coordinate system;
calculating relative coordinates of a plurality of indoor building characteristic points and the outdoor building characteristic points in the indoor model;
and adjusting the position of the indoor model in the coordinate system according to the relative coordinates to realize the fusion of the outdoor model and the indoor model, so as to obtain the simulated building model.
In an embodiment of the present invention, the apparatus is specifically configured to implement the fusion of the simulated architectural model and the surface model by:
performing monomer processing on the simulation building model to obtain bottom surface vector parameters of the building;
acquiring a digital elevation model of the simulation building model;
and fusing the bottom surface of the simulation building model with the ground of the earth surface model according to the bottom surface vector parameters, and fusing the digital elevation model with the earth surface model to obtain the simulation city model.
In an embodiment of the present invention, the apparatus is specifically configured to, after the unitization processing is performed on the simulation building model to obtain bottom surface vector parameters of the building, before the digital elevation model and the surface model are fused to obtain the simulation city model, further include:
and modifying the surface of the simulation building model by utilizing an automatic texture mapping technology.
In one embodiment of the invention, the apparatus is particularly adapted to construct an indoor model of the building by:
obtaining a digital earth surface model of the building according to the outdoor model;
and constructing an indoor model on the digital earth surface model according to the construction information of the building.
Based on the same inventive concept, the present invention provides an embodiment of a simulation city model building apparatus, as shown in fig. 9, including:
a first fusion unit 91 fusing an outdoor model of a building obtained by oblique photogrammetry and an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and a second fusion unit 92 for fusing the simulated building model and the earth model to obtain a simulated city model.
Based on the same inventive concept, an embodiment of the present invention provides a storage medium, in which program code is stored, the program code being configured to perform the following steps when executed:
fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and fusing the simulation building model and the earth surface model to obtain a simulation city model.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for constructing a simulated city model is characterized by comprising the following steps:
fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and fusing the simulation building model and the earth surface model to obtain a simulation city model.
2. The building method according to claim 1, wherein the fusing the outdoor model of the building constructed by oblique photogrammetry and the indoor model of the building constructed by BIM to obtain a simulated building model comprises:
establishing a coordinate system based on the coordinate data of the outdoor model, and taking an outdoor building feature point in the outdoor model as an origin of the coordinate system;
calculating relative coordinates of a plurality of indoor building characteristic points and the outdoor building characteristic points in the indoor model;
and adjusting the position of the indoor model in the coordinate system according to the relative coordinates to realize the fusion of the outdoor model and the indoor model, so as to obtain the simulated building model.
3. The construction method according to claim 1, wherein the fusing the simulated building model with the earth surface model to obtain a simulated city model comprises:
performing monomer processing on the simulation building model to obtain bottom surface vector parameters of the building;
acquiring a digital elevation model of the simulation building model;
and fusing the bottom surface of the simulation building model with the ground of the earth surface model according to the bottom surface vector parameters, and fusing the digital elevation model with the earth surface model to obtain the simulation city model.
4. The construction method according to claim 3, wherein after the integrating the simulation building model to obtain the bottom surface vector parameters of the building, and before the fusing the digital elevation model and the surface model to obtain the simulation city model, the method further comprises:
and modifying the surface of the simulation building model by utilizing an automatic texture mapping technology.
5. The construction method according to any one of claims 1 to 4, wherein the indoor model of the building is constructed by:
obtaining a digital earth surface model of the building according to the outdoor model;
and constructing an indoor model on the digital earth surface model according to the construction information of the building.
6. An apparatus for constructing a simulated city model, comprising: a processor and a memory, wherein the memory stores program code that, when executed by the processor, causes the processor to perform the steps of:
fusing an outdoor model of a building obtained by oblique photogrammetry with an indoor model of the building constructed by BIM to obtain a simulated building model; the outdoor model and the indoor model are fused by placing the coordinate data of the outdoor model and the coordinate data of the indoor model in the same coordinate system;
and fusing the simulation building model and the earth surface model to obtain a simulation city model.
7. The construction apparatus according to claim 6, characterized in that the apparatus is specifically configured to enable the fusion of the outdoor model and the indoor model by:
establishing a coordinate system based on the coordinate data of the outdoor model, and taking an outdoor building feature point in the outdoor model as an origin of the coordinate system;
calculating relative coordinates of a plurality of indoor building characteristic points and the outdoor building characteristic points in the indoor model;
and adjusting the position of the indoor model in the coordinate system according to the relative coordinates to realize the fusion of the outdoor model and the indoor model, so as to obtain the simulated building model.
8. The construction apparatus according to claim 6, wherein the apparatus is specifically configured to enable fusion of the simulated architectural model with a surface model by:
performing monomer processing on the simulation building model to obtain bottom surface vector parameters of the building;
acquiring a digital elevation model of the simulation building model;
and fusing the bottom surface of the simulation building model with the ground of the earth surface model according to the bottom surface vector parameters, and fusing the digital elevation model with the earth surface model to obtain the simulation city model.
9. The construction apparatus according to claim 8, wherein the apparatus is specifically configured to, after the unitization processing of the simulated building model to obtain the floor vector parameters of the building and before the fusion of the digital elevation model and the ground model to obtain the simulated city model, further include:
and modifying the surface of the simulation building model by utilizing an automatic texture mapping technology.
10. Construction apparatus according to any of claims 6-9, in particular for constructing an indoor model of the building by:
obtaining a digital earth surface model of the building according to the outdoor model;
and constructing an indoor model on the digital earth surface model according to the construction information of the building.
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