Batch type refined three-dimensional modeling method of building frame model

Abstract

The invention, which belongs to the technical field of model construction, discloses a batch type refined three-dimensional modeling method of a building frame model. The method comprises the following steps: determining a range frame of a batch type refined modeling region of a building; constructing a three-dimensional model; establishing a frame model index; and constructing a model of a batch type refined modeling accessory structure. According to the method, a BSP building model reconstruction method under a DLG building outer contour constraint is put forward; and with the high-plane precision of a DLG, a defect of low precision of a point cloud boundary is overcome, so that strict matching of the main contour of the frame model with the outer contour of the DLG can be realized. On the basis of a one-to-one correspondence relationship among a building DLG base map, a building point type in a range, and a generated model, batch type refined modeling and quality checking of buildings in a large area can be realized and a well-developed production and quality checking working flow can be formed. A model space matching and duplicating method is put forward and base elevation and precise orientation information of the model can be obtained automatically, so that the precise modeling efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional model construction, in particular to a method for batch fine three-dimensional modeling of building body frame models. Background technique [0002] The methods for building three-dimensional body frame models in the prior art mainly include topographic map methods, traditional aerial photogrammetry methods, engineering measurement methods, and traditional airborne lidar aerial survey scanning methods. Among them, the high-precision and high-density laser scanning point cloud data obtained by the airborne lidar aerial survey scanning method can accurately reflect the three-dimensional space contour information of buildings, and can realize large-scale three-dimensional urban scene modeling. One of the main technical methods of detailed modeling. But there are following problems in prior art: [0003] (1) Currently, methods such as binary trees or quadtrees are mainly used to construct ...

AI Technical Summary

Problems solved by technology

However, due to the lack of rich texture information in the laser scanning point cloud data, the accuracy of the boundary formed by fitting the mesh only based on the point cloud data is low, and it is difficult to ensure that the generated building model boundary meets the corresponding accuracy requirements

[0004] (2) The existing building modeling based on airborne lidar aerial survey can only be modeled manually one by one, which has problems such as low modeling efficiency and large manual operation errors

[0005] (3) In the existing modeling method, when copying the house, it is necessary to manually obtain the base elevation of the model to be copied, and at the same time, it is necessary to manually adjust the placement angle of the model. There is a large workload of manual editing intervention, and it is difficult to ensure the placement of the model Elevation and azimuth accuracy and other issues

[0006] (4) Among urban buildings, there are often many subsidiary structures (such as dormer windows, elevator shafts, etc.) on the roof of a certain building with the same shape but a large number. The number of laser scanning point clouds is also very small, and it is very difficult to model them

When modeling in the existing method, these auxiliary structures need to be manually modeled one by one, the degree of automation is low, and due to manual modeling errors, it is difficult to ensure that the shapes of these auxiliary structures are consistent after body frame modeling, which affects the overall appearance of the building after completion. aesthetics

Images