Estimation of Land Surface Temperature of Yola, North Eastern Nigeria Using Landsat-7 ETM+ Satellite Image
- 1 Department of Physics, Modibbo Adama University of Technology, Yola, Nigeria
- 2 Department of Physics, Adamawa State College of Education, Hong, Nigeria
- 3 Department of Pure and Applied Physics, Adamawa State University, Mubi, Nigeria
Abstract
The land surface temperature of Yola (latitude 9 ° 11'N to 9 ° 20'N and longitude 12 ° 23'E to 12 ° 33'E) North-eastern Nigeria was estimated using landsat-7 ETM+ satellite images. ENVI 4.5 software, and Thermal band 6.2 were used for the estimation, land surface temperature, from Landsat-7 ETM+ imagery sensors acquired as a digital number (DN) range from 0 - 255 in thermal band. DNs were first converted to radiance values in Wm -2 ·sr -1 ·μm -1 , using the bias and gain values specific to an individual pixel, then the radiance was converted eventually to surface temperature (in Kelvin). The results indicate that there is a significant variation in land surface temperature between the two different seasons in Yola. The mean surface temperatures estimated are 307.9 K and 298.1 K during the dry and rainy seasons respectively. The result obtained was compared with data obtained from Meteorological Department. The estimated land surface temperature showed a good correlation, with a difference of 2 K to 3 K.
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