Retrieval and validation of land surface temperature (LST) from NOAA AVHRR thermal images of Gujarat, India
Retrieval and validation of land surface temperature (LST) from NOAA AVHRR thermal images of Gujarat, India
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DOI：
10.1080/01431160210142851
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发表时间：
2003-01
影响因子：
3.4
通讯作者：
B. Bhattacharya;V. Dadhwal
中科院分区：
文献类型：
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作者：
B. Bhattacharya;V. Dadhwal
进行了一项研究，以检索土地（土壤植被复合体）的表面温度（LST）超过100公里2 100公里的面积在古吉拉特邦（印度）使用热波段（通道4和5）和估计发射率从大气校正的归一化差异植被指数，来自NOAA-14 AVHRR数据。LST值进行了比较，在12月和1997年5月在印度古吉拉特邦的陆面过程实验（LAdac）在5个地点的近同步土壤和空气温度测量。在1997年12月13日（冬季）和1997年5月15日（夏季）格林尼治标准时间08.30时，半干旱混合农业贫瘠景观的LST估计值分别为302至305.6 K和317.5至328.5 K。12月，LST值介于气温和土壤表面温度之间，平均偏差分别为2.9K和7.0K。然而，在5月，LST值被发现更接近ST，这可能是由于较低的植被覆盖度和NDVI。
A study was undertaken to retrieve land (soil-vegetation complex) surface temperature (LST) over a 100 km 2 100 km area in Gujarat (India) using thermal bands (channel 4 and 5) and estimated emissivity from atmospherically corrected NDVI, derived from NOAA-14 AVHRR data. The LST values were compared with near synchronous soil and air temperature measurements over five sites in December and May 1997 during Land Surface Processes Experiment (LASPEX) in Gujarat, India. The estimated LST of a semi-arid mixed agricultural barren landscape at 10.00 GMT was found to vary from 302 to 305.6 K on 13 December 1997 (winter) and from 317.5 to 328.5 K at 08.30 GMT on 15 May 1997 (Summer). During December, the LST values were near midway between air temperature (AT) and soil surface temperature (ST) with mean bias of m 2.9 K and 7.0 K respectively. However, in May, the LST values were found to be closer to ST, which may be due to lower fractional vegetation cover and NDVI.