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When the heat is on: urbanization and land surface temperature in Guwahati, India

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Chetia S. , Saikia A. , Basumatary M. , Sahariah D.

Acta Geophysica

2020

tom Vol. 68, no. 3

891--901

The study examines the efects of urbanization on land surface temperature (LST) in Guwahati, a city in India using satellite data. Landsat images were utilized for LST retrieval, land-use land-cover (LULC) classifcation and the normalized diference built-up index mapping. Surface Energy Balance Algorithms for Land and support vector machine methods were used in the study. Results showed that the city has gone through massive changes in its LULC pattern with a high degree of urbanization during the period 1992–2015. The built-up area (BUA) increased to 87.8 km2 in 2015 from 11.6 km2 in 1992 while vegetation decreased from 143.3 to 76.6 km2 . Open spaces and water bodies decreased from 14.5 to 5 km2 and to 6.6 km2 from 6.7 km2 , respectively. Conversely, an increasing trend of LST was observed. The mean LST which was 18.5 °C in 1992 rose to 29.03 °C in 2015. Linear regression used in quantifying the relationship between urbanization and LST showed a positive relationship between LST and BUAs in the city.