地表温度反演算法LSTRetrievalalgorithms汇编.ppt

LST Retrieval algorithms Foreword Foreword(continue) platform：ENVI（The Environment for Visualizing Images） Data：石家庄2013/07/25 Path124Row34（114:26E 38:03N）include 7 bands from地理空间数据云（中国科学院计算机网络信息中心提供） εwater=0.995（when NDVI le 0） εsurface?= 0.9625 + 0.0614FV?- 0.0461FV2?? （when NDVI ge 0.7） εbuilding?= 0.9589 + 0.086FV?- 0.0671FV2???（when NDVI gt 0 and bt lt 0.7） 2.The Radiation luminance values of blackbody in the same temperature Ts:real surface temperature 3.LST Retrieval by the inverse function of Planck formula,we can get : ?TS?= K2/ln(K1/ B(Ts)+ 1) K1 =666.09W/(m2·sr·μm)，K2 =1282.71K 4.Browse * In many environments models, such as atmospheric and surface energy and water vapor exchange, digital weather forecasting, global ocean currents, climate change, etc., LST is an indispensable parameter. we can obtain a regional or global surface temperature distribution only through remote sensing technology. Recent years, many methods have been used to estimate the surface temperature through the detected thermal infrared band which usually effected by atmosphere Basis Surface and atmosphere are both thermal infrared radiation source Radiation can pass through the atmosphere many times being absorbed,scattered and emitted. Planck formula ：atmospheric transmissivity ：Surface Emissivity NDVI：Normalized Difference Vegetation Index Surface Emissivity It reflects the nature of the radiation properties NVDI 1.Surface Emissivity ENVI Basic Tools-Band Math，type in： （b1 le 0）*0.995+（b1 gt 0 and b1 lt 0.7）*(0.9589 + 0.086*b1 - 0.0671*b1^2)+(b1 ge 0.7)*(0.9625 + 0.0614*b1 - 0.0461*b1^2) b1：NDVI Surface Emissivity In theNASA official website (/),enter the time ,latitude and longitude,we can get the parameters we need ENVI Basic Tools-Band Math，type in： （b2-3.39-0.6*（1-b1）*5.12）/（0.6*b1） b1:ε(Surface Emissivity) b2:tatal radiation value ENVI Basic Tools-Band Math，type in： （1282.71）/alog（666.09/b1 +1