A method of producing digital elevation model dem by using three-dimensional satellite images of three-line array

Abstract

The invention discloses a method for producing a digital elevation model by using three-dimensional satellite images of three-line arrays. high-precision orientation; then, according to the overlap rate between any two images and the intersection angle of rays of the same name, etc., construct multiple pairs of dual-image stereo images from the three-line array stereo images with multiple overlapping coverages, and use image dense matching algorithms to extract Digital elevation model DEM; finally, according to the intersection angle, relative accuracy, and phase difference of the two-image stereo images, the weight value of each two-image stereo image is calculated, and based on the weight value, all the two-image stereo images in the area are The DEM extracted from the stereo image is weighted and fused to generate the final DEM product. The invention fully utilizes the information advantages of the three-line array stereo image, and can effectively improve the matching success rate, resolution and product quality of the DEM.

Description

technical field [0001] The invention relates to the technical field of digital elevation model production in surveying and mapping geographic information products, in particular to a digital elevation model production method based on multi-degree overlapping coverage of three-dimensional satellite images of remote sensing satellites. Background technique [0002] Surveying and mapping geographic information resource is a national basic and strategic information resource, which plays an increasingly important role in government management decision-making, industrial development, and people's life. Digital elevation model (Digital Elevation Model, DEM) is a digital simulation of ground terrain through limited terrain elevation data. It is a solid ground model that expresses ground elevation in the form of a set of ordered numerical arrays. As an important form of surveying and mapping geographic information results, DEM is widely used in surveying and mapping, hydrology, meteo...

AI Technical Summary

Problems solved by technology

However, the algorithm of this method has high complexity and low maturity, and it is not easy to detect suspicious areas such as occlusion. When there are large differences in phase, radiation and geometry between different images that constitute a stereoscopic image, it will have a great impact on the matching effect. The quality of the DEM generated by the match is not high

In short, the current methods of generating DEM using three-view (or multi-view) stereo images with multiple overlapping coverages have relatively large limitations, and it is urgent to find other new technical methods in order to make full use of three-view (or multi-view) stereo images. information advantages, more effectively realize the production of high-quality DEM products

Images