摘要
装备在高分七号卫星上的是我国首个具备全波形记录功能的激光测高仪,主要用于获取地面稀疏的高程控制点,提高了同平台立体影像无地面控制点的立体测图精度。高分七号卫星激光测高标准化处理是测绘应用的关键步骤,所生成的激光测高标准产品是后续对外分发和业务化应用的重要前提。本文围绕高分七号卫星的激光数据,研究了激光测高数据处理方法,验证了激光测高标准产品的几何精度。选择几何定标区以及陕西华阴、德国北威州等多个验证区,结合高精度外业测量点和机载LiDAR-DSM数据,对高分七号卫星激光测高标准产品开展精度验证。验证结果表明,高分七号SLA03产品定标区两波束激光的平面精度分别为(3.896±1.029)m和(3.286±0.337)m、高程精度分别为(0.018±0.099)m和(-0.017±0.096)m。采用高程控制点质量控制参数ECP_Flag能有效标识出可用于高程控制的激光点,其中陕西华阴验证区两波束激光总体精度分别为(-0.113±2.519)m和(0.191±1.071)m,经质量控制后ECP_Flag标记为1的激光点高程精度为(0.111±0.152)m和(-0.064±0.115)m;德国北威州总体精度为(-0.897±5.485)m和(-0.202±6.207)m,ECP_Flag标记为1的激光点高程精度为(-0.304±0.190)m和(-0.279±0.220)m。目前高分七号卫星激光测高标准产品已在自然资源部国土卫星遥感应用中心实现业务化生产。
GF-7 satellite is equipped with the first full waveform laser altimeter of China for earth observation,which is mainly used to obtain sparse elevation control points on the ground,and ultimately improve the stereo mapping accuracy of stereo images without ground control points.The laser altimetry standardization processing of GF-7 satellite is the key step of surveying and mapping application,and the generated laser altimetry standard products are the important premise of subsequent distribution and application.Based on the GF-7 satellite laser altimetry data,this paper studies the method of laser altimetry data processing,and preliminarily validates the geometric accuracy of laser altimetry standard products.Three regions are selected to validate the accuracy of GF-7 satellite laser altimetry standard products,which contain the domestic geometric calibration area,Huayin of Shaanxi province,North Rhine-Westphalia of Germany.The results show that the planimetric accuracy of laser altimetry standard products SLA03 in calibration area is(3.896±1.029)m and(3.286±0.337)m,and elevation accuracy is(0.018±0.099)m,(-0.017±0.096)m in respectively for the two-beam lasers.Moreover,the elevation control point quality control parameter ECP_Flag can effectively identify the laser points that can be used for elevation control.The overall accuracy of Shaanxi Huayin area is(-0.113±2.519)m and(0.191±1.071)m,respectively for the two beams.The elevation accuracy of laser points marked with ECP_Flag=1 is(0.111±0.152)m and(-0.064±0.115)m.The overall accuracy of Norwich in Germany is(-0.897±5.485)m and(-0.202±6.207)m,and the elevation accuracy of laser points marked with ECP_Flag=1 is(-0.304±0.190)m and(-0.279±0.220)m,respectively for the two beams.At present,the laser altimetry standard products of GF-7 satellite have been daily produced in the Land Satellite Application Center of the Ministry of Natural Resources.
作者
李国元
唐新明
陈继溢
么嘉棋
刘诏
高小明
左志强
周晓青
LI Guoyuan;TANG Xinming;CHEN Jiyi;YAO Jiaqi;LIU Zhao;GAO Xiaoming;ZUO Zhiqiang;ZHOU Xiaoqing(Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China;College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China)
出处
《测绘学报》
EI
CSCD
北大核心
2021年第10期1338-1348,共11页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(41971425)
高分遥感测绘应用示范系统(二期)(42-Y30B04-9001-19/21)。
关键词
高分七号卫星
卫星激光测高
标准产品
精度验证
高程控制点
GF-7 satellite
satellite laser altimetry
standard product
accuracy validation
elevation control point