Studies on Surface Temperature using Remote Sensing Technique in the NW Part of Bangladesh

Abstract

A simple and straightforward technique based on remote sensing was applied for the estimation of surface emissivity and surface temperature at different dates in the northwestern part of Bangladesh for the summer and autumn period (March through October). Surface temperature was estimated from Pathfinder AVHRR Land (PAL) daily data. For this estimation different split window algorithms were employed. Estimated results show a discrepancy ranging from 0.04°C to 4.0°C. Surface emissivity was calculated based on fractionation of vegetation cover and NDVI at pixel level calculated from TM data. TM data was corrected for atmospheric effect. PAL data set was provided after atmospheric and geometric correction. Both air temperature and estimated surface temperature shows a decreasing trend from south to farther north. However, no distinct trend could be recognized in the temporal variation in surface temperature and in measured air temperature. A general trend of negative relationship could be concluded between NDVI and surface temperature from this study.