AMTIS单通道多角度热红外图像的大气订正  

ATMOSPHERIC CORRECTION FOR AMTIS SINGLE-CHANNEL MULTI-ANGULAR THERMAL-INFRARED IMAGERY

作　　者：何立明[1] 阎广建[2] 李小文[2] 王桥[1] 王文杰[1] 

机构地区：[1]中国环境监测总站环境卫星中心筹备办公室,北京100029 [2]北京师范大学地理学与遥感科学学院,北京100875

出　　处：《红外与毫米波学报》2006年第6期429-433,共5页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金(40471095);国家重点基础研究发展规划项目(20000G77900);国家863(2003AA134040)资助项目

摘　　要：给出了在假定无大气廓线情况下,AMTIS单通道多角度热红外图像的大气订正算法.算法需要三个参数:其中大气等效温度,用“最小标准差法”从图像自身来估算;大气透过率通过地表的绝对湿度或者太阳辐射计得到的大气水汽含量参数来估算;像元的辐射率比由AMTIS得到的NDVI计算.通过将大气订正后的亮度温度与地面实测点亮度温度比较,两者相差约1.2K,这对于无大气廓线情况下单通道热红外图像的大气订正来说,结果是可以接受的.The atmospheric correction algorithm for the TIR band of AMTIS （ airborne multi - angle TIR/VNIR imaging System） was presented. This algorithm is suitable for the case in which no atmospheric profile is available. Three parameters are considered in this algorithm ： the atmospheric equivalent temperature is determined from the image itself by using a ＂minimal standard deviation＂ method or the local air temperature near the surface ; the transmittance is calculated from the water vapor content of the column, which can be determined from the surface absolute humidity or from sunphotometer; the emissivity of the pixel is determined from NDVI. The atmospheric correction result is validated by using synchronous experiment data, and the precision of brightness temperature is less than 1.2 K, which is acceptable when the atmosphere profiles is not available.

关 键 词：热红外 大气订正 单通道 多角度 

分 类 号：TP75[自动化与计算机技术—检测技术与自动化装置]