Method of Extracting Urban Building Height Based on Multi-temporal Remote Sensing Image Shadow

Abstract

Based on the method of extracting the height information of urban buildings based on the shadows of multi-temporal remote sensing images, the present invention aims to form a systematic, fast and accurate method, using two remote sensing images of different time phases (the two images have different sun elevation angles and satellite azimuths) Angle), to analyze and calculate the shadow of the target building in batches, and then realize the rapid and accurate extraction of the height of the target building in the area, which will help to improve the efficiency of measurement, 3D modeling and other work; the specific implementation is mainly through calculation The length of the building shadow, combined with the angle relationship between the landmark building and its shadow on the image, selects the corresponding mathematical model to calculate the height value of the target building in the area; the two sets of building height results calculated by using two remote sensing images are used to construct a simulation model based on the least squares method. Combine the equations to obtain the corrected height of the target building, thereby improving the accuracy of the calculation results.

Description

technical field [0001] The invention relates to the technical fields of remote sensing image processing, mathematical model design and three-dimensional structure, in particular to a method for extracting urban building height information based on multi-temporal remote sensing image shadows. Background technique [0002] With the development of the times, the speed of urbanization expansion in my country is getting faster and faster. Urban expansion includes two aspects of urban horizontal space expansion and vertical space expansion: horizontal space expansion is manifested as a sharp increase in the built-up area; vertical space is mainly manifested as The increase in the height of urban buildings, and the expansion of the vertical height of the city, on the one hand, relieves the pressure brought about by the expansion of horizontal space, and on the other hand, it can form a compact urban spatial form, which is convenient for the deployment of urban planning, resource allo...

AI Technical Summary

Problems solved by technology

These methods have the advantages of high efficiency, fast speed, and convenience, but they also have the disadvantage of being greatly affected by time and space limitations.

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