On-satellite laser altimeter rough error elimination method integrated with multi-source data

Abstract

The invention discloses a method for removing gross errors of a space-borne laser altimeter integrated with multi-source data. The method is as follows according to specific steps: (1) calculate the echo reflectivity, and then remove the laser echo data whose reflectivity is too low; (2) Identify the position of the cloud layer from the image of the footprint camera and remove the laser echo data reflected by the cloud layer; (3) With the support of auxiliary data, generate generalized elevation control points from the echo data of the altimeter; (4) Use the reference DEM data Auxiliary elimination of gross errors in the altimetry data; (5) Substituting the altimetry data into the stereoscopic image as elevation control points to assist in the block adjustment under weak intersection conditions, and continuously eliminating the point with the largest elevation difference until the adjustment The result converges. The elevation control point data can be obtained through this method, and the production precision of the global terrain data can be improved. Since the present invention combines multiple data to eliminate gross errors, the problem of low precision under a single reference source is avoided, and it has the characteristics of good robustness and high precision.

Description

technical field [0001] The invention belongs to the technical field of remote sensing and earth observation, and relates to a method for eliminating gross errors of a spaceborne laser altimeter integrated with multi-source data. Background technique [0002] Due to the influence of aerosol on the laser transmission path, the waveform decomposition and the error in the production process of the generalized elevation control point, there are some gross errors in the generalized elevation control point obtained by the spaceborne laser altimeter. As the source of elevation control points for stereo mapping satellites, the gross error contained in the spaceborne laser altimeter will have a great impact on the adjustment accuracy of the dual line array images of the stereo mapping satellites. Reliable gross error elimination means to remove elevation control points containing gross errors from the spaceborne laser altimeter altimetry data set. [0003] One of the existing methods...

AI Technical Summary

Problems solved by technology

However, due to the low density of spaceborne laser altimeter data, it is impossible to form a planar point set, and there is no spatial correlation between each data.

As a result, the existing gross error removal algorithm cannot be effectively applied to the gross error removal of spaceborne laser altimeter data

However, the data containing gross errors will have a greater impact on the elevation adjustment of the dual-line array image of the domestic stereoscopic mapping satellite, which may cause the mapping to fail to meet the accuracy requirements of 1:10,000.

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