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

  • role： First author第一作者
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

    Surveying and Mapping Data Archives of Guizhou Province, Guiyang 550004, China

    School of Geomatics, Liaoning Technical University, Fuxin 123000, China

  • Email：351258581@qq.com
  • Introduction：杨雄丹，研究方向为对地卫星激光测高数据处理与应用。E-mail：351258581@qq.com
YANG Xiongdan123,  
  • Affiliation：

    School of Geomatics, Liaoning Technical University, Fuxin 123000, China

WANG Peixian3,  
  • role： Corresponding author通信作者
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

    School of Geomatics, Liaoning Technical University, Fuxin 123000, China

  • Email：ligy@lasac.cn
  • Introduction：李国元，研究方向为卫星激光测高数据处理与应用。E-mail：ligy@lasac.cn
LI Guoyuan13*,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

CHEN Jiyi1,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

    School of Electronic Information of Wuhan University, Wuhan 430072, China

ZUO Zhiqiang14,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

    School of Geomatics, Liaoning Technical University, Fuxin 123000, China

XIE Dongping13,  
  • Affiliation：

    Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China

YANG Chao1

résumé

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.

mots-clés

satellite laser altimetry;ICESat/GLAS;LPA spot image;Extraction of LPA characteristic parameters;gray weighted matrix method;centroid extraction

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