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A digital city skyline extraction method

A digital city and extraction method technology, applied in image data processing, image analysis, image enhancement and other directions, can solve the problems of single viewpoint, low computational complexity, limitations, etc., and achieve the effect of simple operation and low computational complexity

Active Publication Date: 2021-11-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a digital city skyline extraction method, which can effectively avoid the problem of single viewpoint and limited by the position of the photographer caused by extracting the city skyline from photos , with low computational complexity

Method used

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  • A digital city skyline extraction method
  • A digital city skyline extraction method
  • A digital city skyline extraction method

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Embodiment 1

[0053] refer to figure 1 , with the urban planning 1:2000 topographic map of Luonan County, Shangluo City, Shaanxi Province as the data source, a composite urban 3D model of some buildings and terrain in Luonan County was established. In the coordinate system of the city model, coordinate points (1908,1126,1100) is the observation viewpoint, extract and visualize the skyline with this point as the observation viewpoint, among them, select the observation viewpoint A in the digital city 3D model, the observation distance D is 1000, and the horizontal field angle is 120 ° and the vertical viewing angle is 70°, among which, the upward viewing angle is 30°, and the downward viewing angle is 40°. The extracted 3D skyline results are as follows Figure 4a As shown, the main view of the relationship between the extracted 3D skyline and buildings is as Figure 4b As shown, the extracted top view of the relationship between the 3D skyline and buildings is as follows Figure 4c shown....

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Abstract

The invention discloses a digital city skyline extraction method, comprising the following steps: 1) constructing a three-dimensional model of a digital city; 2) forming a contour point set of a building; 3) determining a projection cylinder and a projection range of the skyline; 4) Starting from the observation point of view, carry out cylindrical projection transformation along the observation point-building-projection cylinder to the interpolated building outline points to obtain the skyline projection outline points of the building; 5) eliminate the skyline of the blocked building Projection contour point, get the skyline projection contour point of remaining building; 6) utilize the skyline projection contour point fitting skyline projection point set of remaining building of step 5) to obtain, to form continuous building group skyline, finish Digital city skyline extraction, this method can effectively avoid the problem of single viewpoint and limited by the photographer's position caused by extracting the city skyline through photos, and the calculation complexity is low.

Description

technical field [0001] The invention belongs to the technical field of graphic processing in the field of digital city planning, and relates to a method for extracting a digital city skyline. Background technique [0002] The skyline is an important form of expression of the city's shape and outline, and it is also the main component of urban landscape resources. Although it is only the two-dimensional facade outline of the city from a certain perspective, it reflects the three-dimensional spatial hierarchy. One of the elements of ", the skyline is the most direct and concrete display of the urban spatial landscape, and often becomes the business card and characteristic identification line of the city's image, which is of great significance for strengthening the city's recognizability and displaying the regional features. Therefore, Urban planning and design centered on urban skyline control can effectively enhance the spatial order of regional development and enhance the ov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/181
CPCG06T2207/10012G06T7/181
Inventor 孔月萍王涵张倩党爽王佳婧
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY