利用NDVI估算云覆盖区的地表温度  

Estimation of Land Surface Temperature in Cloudy Region of Landsat TM Image Based on NDVI

作　　者：苏洁[1] 徐军[1] 刘丽强[1] 戴一锋[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098

出　　处：《地理空间信息》2013年第5期25-28,10,共4页Geospatial Information

基　　金：国家127专项资助项目(GZH201100311-01-04)

摘　　要：利用同源不同时相的遥感影像替换云覆盖区下的NDVI值,确定无云区的NDVI与LST之间的函数关系式,再运用此函数关系和云覆盖区NDVI值估算其地表温度。以连云港市为例,针对NDVI-LST两者相关性应存在多种可能,验证其在线性关系、对数关系、二次多项式关系3种不同拟合关系下地表温度之间的差异及其估算精度。结果表明,3种拟合关系误差精度均在MAE<0.94℃,RSME<0.92℃范围内,且估算精度基本与相关系数呈负相关,能够满足一般实际应用的要求。The NDVI values under cloud cover were replaced by the use of multi-temporal remote sensing imageries to determine the function relationship between LST and NDVI in cloudless areas for estimating the LST. In this paper, taking Lianyungang City as an example, the differences of surface temperature and its estimation accuracy was validated under different fitting relationships according to the correlations between NDVI and LST. Three fitting relations,linear relationship, logarithmic relationship and quadratic polynomial relationship, was employed respectively. The results show that the error accuracies of the three fitting relations meet the general practical application and MAE <0.94℃, RSME <0.92℃, and the estimation accuracy is negatively correlated with the correlation coefficient.

关 键 词：NDVI 地表温度 云覆盖像元 估算误差 

分 类 号：P237.9[天文地球—摄影测量与遥感]