A digital city skyline extraction method
A digital city and extraction method technology, applied in image data processing, instruments, calculations, etc., can solve problems such as single viewpoint, low computational complexity, limitations, etc., and achieve the effect of simple operation and low computational complexity
Active Publication Date: 2019-01-29
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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[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
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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 point of view, extract and visualize the skyline with this point as the observation point of view, where, the observation point A is selected 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 s...
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The invention discloses a digital city skyline extraction method, comprising the following steps: 1) constructing a digital city three-dimensional model; 2) forming a contour point set of the building; 3) determining a projection cylinder and a projection range of the skyline; 4) From the viewpoint of observation, along the observation viewpoint-building-projection column, performing column face projection conversion on interpolated building contour points to obtain the skyline projection contour points of the building. 5) eliminating the skyline projection contour points of the blocked buildings to obtain the skyline projection contour points of the remaining buildings; 6) utilizing the skyline projection contour points of the remaining buildings obtained in the step 5) to fit the skylineprojection point set, In order to form a continuous skyline of buildings and complete the digital city skyline extraction, the method can effectively avoid the problem of single viewpoint and limitedby the photographer 's position when extracting the urban skyline through the photograph, and the computational 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...
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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