Satellite stereo image shadow calculating method integrated with light detection and ranging (LiDAR) point clouds

Abstract

The invention discloses a satellite stereo image shadow calculating method integrated with light detection and ranging (LiDAR) point clouds. The method comprises the following steps of: firstly, filtering original LiDAR point cloud data to obtain the LiDAR point clouds of non-ground points such as buildings, trees and the like; secondly, obtaining an enclosing polygon of a terrain point set, a terrain contour polygon and an outline polygon of a building by using a point wrapping algorithm with distance control, judging the position relation between a point and a polygon and filtering and simplifying the shape of the terrain contour polygon respectively; and finally, resolving an object space coordinate of the shadow of the building by taking an image of the altitude angle and azimuth angle of the sun instantaneously and determining the conversion relationship between the object space coordinate and an image space coordinate according to a satellite stereo image space RFM geometry correction result to obtain the coordinate and position of the shadow of the building in the image space. The method has the advantages of capability of obtaining a shadow area and a coordinate range of a high-resolution satellite image efficiently and fast and obtaining a precise shadow position coordinate and stability.

Description

technical field

[0001] The invention belongs to the application field of LiDAR point cloud and satellite stereoscopic remote sensing data city space data acquisition and update, and relates to a satellite stereoscopic image shadow calculation method integrating LiDAR point cloud, especially based on airborne LiDAR point cloud and high-resolution satellite stereoscopic image The calculation method of urban building shadow. Background technique

[0002] A prominent sign of the progress of earth science since the 20th century is the rapid development of earth observation technology, mainly including airborne earth observation technology and spaceborne earth observation technology. In recent years, airborne and spaceborne earth observation technologies are mainly represented by the emergence of airborne laser scanning (LiDAR, Light Detection And Ranging) and the wide application of high-resolution satellite images. The information obtained is getting richer and faster, and the ...

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