A method for measuring the elevation angle of ground obstructions based on spaceborne stereoscopic optical images

Abstract

The invention discloses a ground shelter elevation measurement method based on a satellite-borne stereoscopic optical image. The method comprises the following steps: firstly, reading a satellite-borne optical stereoscopic image and a point file; constructing an RPC model and various point coordinates according to the files; determining ground point coordinates and an initial value of an image space transformation model; constructing an error equation point by point; normalizing the error equation, wherein a normal equation is changed to eliminate the ground point correction number, and optimization of the inversion process is carried out to obtain an affine transformation correction number; continuously updating the ground point coordinates and image orientation parameters through an iteration process; calculating the object space precision and the image space precision during each balancing iteration, and outputting the correction parameters and a precision report of the balancing object space precision and the image space precision and updating an RPC file; selecting a feature point pin-point of a test area on the three-dimensional image, and outputting a pin-point file; and finally, obtaining the geographic coordinates of the feature point by using the updated RPC files and calculating the elevation value and the observation precision of the elevation value.

Description

technical field [0001] The invention belongs to the technical field of remote sensing, and relates to a method for measuring the elevation angle of a ground obstruction, in particular to a method for measuring the elevation angle of a ground obstruction based on a space-borne stereoscopic optical image. Background technique [0002] With the development of my country's communication industry, low-orbit communication satellites are playing an increasingly important role in the inter-satellite communication chain. Since the occlusion of ground obstacles has a significant impact on the availability of low-orbit communication satellites, it is necessary to measure the surrounding environment of the satellite signal receiving ground station area to obtain the occlusion angle range of ground objects to satellite signals, so as to estimate the availability of communication satellites . Ground obstructions may be mountains, trees, and other wave-impermeable entities that may block ...

AI Technical Summary

Problems solved by technology

Traditionally, field surveyors can use surveying and mapping equipment to measure occlusion angles for availability analysis. However, the areas of interest may be scattered all over the world. If field surveyors conduct on-site measurement, it will greatly reduce work efficiency and increase work costs.

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