Accuracy Optimization Of DSM Using Satellite Laser Altimetry Data

This paper focuses on the accuracy verification of laser altimeters points,the screening of elevation control points and the application of laser altimeters technology.It focuses on the processing and application of laser altimeters data,and discusses and practices accuracy verification of laser altimeter data,DSM optimization model and accuracy verification of water area.This paper systematically summarizes the three existing laser altimeter satellites at home and abroad,summarizes the basic information of ICESat/GLAS including product classification,introduces the basic information of the experimental laser altimeter of ZY-3 02,expounds the system composition of GF-7 laser altimeter,introduces the research status of satellite laser altimetry data verification elevation accuracy and monitoring water level elevation and existing global control points at home and abroad,and compares the generalized elevation control points extracted from laser altimetry data with the traditional elevation control points.Shaanxi province was taken as a test area to verify the elevation accuracy of GLAS.The DSM precision optimization model proposed in this paper has greatly improved the DSM elevation accuracy,and take the high mountain area with no obvious comparison before and after optimization as an example,the key to waveform standard deviation and filtering area as a filter condition,discuss the terrain slope and object for the influence of the laser height control points,and analysis results that the influence of the terrain slope is more significant.This paper proposes the idea of automatically and accurately editing technology of water system elevation between different products with GF-7 as reference data,and verify the water elevation accuracy of existing GLAS data in the study area of Kazakhstan and Turkmenistan,thus providing a theoretical basis for the subsequent application of GF-7 data.The relevant conclusions of this paper provide a good reference for the future business application of laser altimeter in China,provide a practical value for the application of laser altimeter in uncontrolled stereo mapping,and provide a good reference significance for the optimization of overseas DSM data and the screening of elevation control points.