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Retrieval and validation of land surface temperature (LST) from NOAA AVHRR thermal images of Gujarat, India

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A study was undertaken to retrieve land (soil-vegetation complex) surface temperature (LST) over a 100 km × 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 −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.

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/01431160210142851

Affiliations: Crop inventory and modeling division, Agricultural Resources Group, RESA, Space Applications Centre, Ahmedabad--380015, Gujarat, India

Publication date: March 1, 2003

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