中国风云二号SVISSR传感器热红外波段与AIRS/Aqua的交叉辐射定标  

Intercalibration of SVISRR/FY-2 Thermal Infrared Channels with AIRS/Aqua Channels

作　　者：蒋耿明[1] 金亚秋[1] 

机构地区：[1]复旦大学波散射与遥感信息重点实验室,上海200433

出　　处：《遥感技术与应用》2012年第4期504-510,495,共8页Remote Sensing Technology and Application

基　　金：国家自然科学基金(40901158);教育部留学归国人员启动基金

摘　　要：对高光谱卷积法进行了改进,实现了卫星影像之间的亚像素匹配和粗差的剔除,对搭载在中国"风云二号"(FY-2)C、D和E星上的伸展的可见光和红外自旋转扫描辐射计(SVISSR)的两个热红外波段IR1(～10.9μm)和IR2(～11.9μm)与搭载在Aqua卫星上的大气红外探空仪(AIRS)高光谱波段进行交叉辐射定标。基于SVISSR/FY-2和AIRS/Aqua对地观测的几何特性,选取研究区域覆盖41.5°～149.5°E、10°S～10°N的范围,利用该研究区域2006年12月、2007年9月和12月、2009年9月和2010年5月的SVISSR/FY-2标称数据和AIRS/Aqua红外1B数据,在同地点、同一天太阳天顶角之差的绝对值小于2°、观测天顶角之差的绝对值小于3°和相对方位角之差的绝对值小于6°的匹配条件下,提取匹配的观测点对,然后对匹配观测点对进行回归分析,得到交叉辐射定标系数。结果表明:SVISSR/FY-2波段观测值与卷积得到的AIRS/Aqua观测值之间高度线性相关,且SVISSR/FY-2的两个热红外波段相对于AIRS/Aqua波段存在定标偏差。并给出了交叉辐射定标系数。Intercalibration of the thermal infrared window channels 1 （-10.9 μm） and 2 （-11.9 μm） of the Stretched Visible and Infrared Spin Scan Radiometer on FengYun 2 （SVISSR/FY-2） satellites C, D and E with the hyper-spectral channels of the Atmospheric InfraRed Sounder on board Aqua （AIRS/Aqua） was developed using the High Spectral Convolution （HSC） method, which was improved in two aspects,sub-pixel spatial matching and automatic removal of the measurement pairs with coarse errors. According to the view geometries of SVISSR/FY-2 and AIRS/Aqua, with the study area longitude from 41.5°E to 149.5°E and the latitude from 10°S to 10°N was selected. To transfer the calibration coefficients from AIRS/Aqua channels to SVISSR/FY-2 channels,the SVISSR/FY-2 Nor- malized （NOM） 1B data and AIRS/Aqua 1B infrared product in December of 2006 ,September of 2007,December of 2007 ,September of 2009 and May of 2010 covering the study area were employed and aggregated with longitude and latitude spatial resolutions of 0.5°× 0.5°. Measurement pairs are extracted from the ag- gregated SVISSR/FY-2 and AIRS/Aqua images with the following criterions： co-location,absolute solar zenith angle difference in the same day less than 2° （｜ ASZA｜〈2°） ,absolute viewing zenith angle differences less than 3° （｜ AVZA｜ 〈3°） ,and absolute relative azimuth angle differences less than 6° （｜ ARAA｜ 〈 6°）. The results show that the SVISSR/FY-2 measurements are linearly related to the convolved AIRS/ Aqua measurements with large correlation coefficients. Conversely, AIRS/Aqua channels, the calibration biases exist in the two SVISSR/FY-2 thermal infrared channels, and the re-calibration coefficients are prescnted.

关 键 词：交叉辐射定标 SVISSR/FY-2 AIRS/Aqua 热红外波段 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]