Extraction and analysis of space-borne laser spot image characteristic parameters

被引：0
|
作者：
Yang X. [1 ,2 ,3 ]
Wang P. [3 ]
Li G. [1 ,3 ]
Chen J. [1 ]
Zuo Z. [1 ,4 ]
Xie D. [1 ,3 ]
Yang C. [1 ]
机构：
[1] Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing
[2] Surveying and Mapping Data Archives of Guizhou Province, Guiyang
[3] School of Geomatics, Liaoning Technical University, Fuxin
[4] School of Electronic Information of Wuhan University, Wuhan
来源：
National Remote Sensing Bulletin | 2022年 / 26卷 / 03期
关键词：
Centroid extraction; Extraction of LPA characteristic parameters; Gray weighted matrix method; ICESat/GLAS; LPA spot image; Satellite laser altimetry;
D O I：
10.11834/jrs.20229320
中图分类号：
学科分类号：
摘要：
The quality of ICESat/GLAS satellite laser altimetry data is mainly dependent on the complex relationships between several factors in the path of laser transmission and on the illuminated surface, including clouds, atmospheric aerosol, satellite pointing, laser energy, topography, vegetation, footprint size, shape, and orientation. Although ICESat/GLAS has a high precision of elevation (~10 cm), the horizontal accuracy is relatively poor (~5 m). Therefore, the precise positioning of the laser shoot point has become an urgent problem.In the ideal situation, the energy intensity distribution of the LPA is approximately Gaussian, and its shape is approximately elliptic on the ground. Considering the effect of the attenuation of the transmitted laser energy in the atmosphere, the size of the spot image boundary can be determined by the 1/e2 maximum energy after eliminating the influence of the background noise of the LPA image. Therefore, we extracted the Laser Profile Array (LPA) image centroid and parameters of ICESat/GLAS via the 1/e2 maximum energy distribution and the least square ellipse fitting in different campaigns, respectively.Result shows that the extraction and relative positioning accuracies/frequencies of the LPA centroid can reach 0.9″/40 Hz and 0.37″/40 Hz, respectively, which are better than 0.3 and 0.11 pixels, respectively. The centroid results are similar to the official centroid provided in GLAH05. The parameters, namely, azimuth (computed as the angle between major axis and the LPA x-axis), major axis, eccentricity, and total intensity, were only approximations using the maximum energy distribution in different campaigns.The method in this study can effectively monitor the changes of these parameters. The characteristic extraction and analysis of space-borne laser spot image are of great significance to data processing and quality evaluation. ICESat's spot image data were utilized to carry out experimental verification, providing reference for the launched of GF-7 and the follow-up domestic Terrestrial Ecosystem Carbon Monitoring Satellite. © 2022, Science Press. All right reserved.
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页码：555 / 567
页数：12
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