POBI在贵州山区的CYGNSS地表反射率插值精度分析  

Accuracy analysis of surface reflectance interpolation based on CYGNSSby using POBI in mountainous area of Guizhou Province

作　　者：龙安成 张显云[1] 刘晶晖 邓小东[1,2] 孙俊英 LONG Ancheng;ZHANG Xianyun;LIU Jinghui;DENG Xiaodong;SUN Junying(School of Mining,Guizhou University,Guiyang,Guizhou 550025,China;College of Resources and Environment,Zhejiang University,Hangzhou,Zhejiang 310058,China;Guizhou Second Institute of Surveying and Mapping,Guiyang,Guizhou 550004)

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]浙江大学资源与环境学院,浙江杭州310058 [3]贵州省第二测绘院,贵州贵阳550004

出　　处：《贵州师范大学学报(自然科学版)》2025年第1期33-45,共13页Journal of Guizhou Normal University:Natural Sciences

基　　金：贵州省省级科技计划项目(黔科合支撑[2022]一般204);贵州省省级科技计划项目(黔科合基础-ZK[2024]一般093)。

摘　　要：POBI插值方法使得基于CYGNSS实现对地的单日无缝探测成为可能,但其在较高植被覆盖和较高地形起伏区域的插值精度尚有待验证。以具有较高地形起伏度和植被覆盖度的贵州为研究区,在确定出适宜的POBI插值参数基础上,以2020—2021年的地表反射率作为建模历史数据集,2022年1月、3月、6月的地表反射率为待插值,分析POBI的插值精度。结果表明:尽管受较高植被覆盖和地形起伏的影响,POBI插值方法在贵州山区也可获得较高的插值精度,具有较好的普适性;相比于1月和3月,受植被生长更为旺盛的影响,6月的插值精度相对较低,均方根误差和平均绝对误差分别为2.330 5 dB和1.720 2 dB;低植被覆盖度和地形小起伏区的插值精度最高,插值精度整体随植被覆盖度和地形起伏度的增加呈下降趋势。The POBI interpolation method makes it possible to achieve seamless daily surface coverage over the earth based on CYGNSS,but its interpolation accuracy in areas with higher vegetation coverage and higher topographic relief still needs to be verified.Taking Guizhou,which has higher topographic relief and vegetation coverage,as the research area,this study experimentally analyzed the interpolation accuracy of POBI on the basis of determining appropriate interpolation parameters by using the surface reflectance data from^(2)020 to 2021 as the model historical data set,and which from January,March,and June 2022 as the interpolation target.The results show that the POBI interpolation method can obtain higher interpolation accuracy and better universality in Guizhou,although it is affected by higher vegetation cover and topographic relief.Compared with January and March,due to more vigorous vegetation growth,the accuracy of interpolation in June is relatively low,and the root mean square error and average absolute error are 2.3305 dB and 1.7202 dB,respectively.The accuracy of interpolation is highest in areas with low vegetation coverage and small relief,and decreases as vegetation coverage and relief increase.

关 键 词：CYGNSS POBI 地形起伏 植被覆盖 插值精度 

分 类 号：P228.9[天文地球—大地测量学与测量工程]