High-fineness urban three-dimensional modeling method

Abstract

The invention discloses a high-fineness urban three-dimensional modeling method and relates to the field of three-dimensional digital urban construction, airborne LIDAR (light detection and ranging) is adopted for acquiring original aerial survey data result, and an urban high-precision digital elevation model, a digital orthophoto map and a building three-dimensional body frame model are manufactured on the basis, thereby forming a foundation framework of an urban three-dimensional scene; then a vehicle-mounted movable laser scanning device is used for acquiring vehicle-mounted movable laser scanning original data result, and a high-fineness model of all types of opuscules and ground objects of an urban is acquired by performing the ground object high-fineness three-dimensional modeling under the mode of fusing vehicle-mounted point cloud after precision optimization with a photo according to a ground object parameter model base under the three-dimensional modeling environment; and the foundation framework of the urban three-dimensional scene and the high-fineness model of all the types of the opuscules and the ground objects of the urban are integrated, thereby acquiring a high-fineness three-dimensional virtual urban scene of the urban. With the adoption of the method, production efficiency is improved, project cost is reduced, development cycle is shortened, modeling fineness is improved, and actual application needs can be met.

Description

technical field [0001] The invention relates to the field of three-dimensional digital city construction, in particular to a high-precision three-dimensional modeling method for cities. Background technique [0002] The 3D urban modeling methods in the prior art mainly use traditional surveying and mapping methods such as topographic map methods, traditional aerial photogrammetry methods, satellite remote sensing methods, engineering survey methods, and ground laser scanning methods for urban 3D modeling. However, the above methods have their obvious disadvantages and deficiencies: [0003] (1) To use the topographic map method, a large-scale digital line drawing with strong current situation is required in the urban area, and the building height is obtained through visual estimation or manual measurement for modeling. This method has problems such as lack of elevation information of ground objects, poor elevation accuracy of building models, and poor roof fineness; [000...

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Problems solved by technology

This method has problems such as lack of elevation information of ground objects, poor elevation accuracy of building models, and poor roof fineness;

[0004] (2) The traditional aerial photogrammetry method needs to be measured in the constructed stereo image pair, which not only has poor elevation accuracy of the extracted model, but also has the problem of very low modeling efficiency;

[0005] (3) Using the satellite remote sensing method, due to the low spatial resolution of the ground image, the extracted models, especially the building models, have very poor accuracy and fineness, which cannot meet the application requirements of high-precision 3D digital city modeling;

[0006] (4) Using engineering measurement methods to model urban scenes has many disadvantages, such as high labor intensity, low work efficiency, low degree of digitization, and high development costs;

[0007] (5) The ground laser scanning method has problems such as high labor intensity, low work efficiency and unsuitability for large-scale 3D urban scene modeling.

[0008] Therefore, when the topographic map method, traditional aerial photogrammetry method, satellite remote sensing method, engineering measurement method and ground laser scanning method in the existing technology are used in the construction of a 3D digital city, there are low development efficiency, high cost, long period and Disadvantages such as poor modeling precision

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