Impact of urban development and Vvegetation on land surface temperature of Dhaka City

Abstract

This paper addresses both quantitative and qualitative assessment of the relationship between the land surface temperatures (LST) and land cover (LC) changes in Dhaka Metro Area (DMA) using Landsat TM/ETM+ data over the period from 1989 to 2010. The LC map was prepared using supervised classification methods. On the other hand, using the calibration of spectral radiance and emissivity correction LST has been derived from the thermal band of Landsat TM/ETM+. To establish the relationship between LST and LC, GIS based spatial simulation has been conducted. The changing of LST is found to be directly correlated with LC transition. LST has shown to increase in areas with growing urban developments. In contrary, the amount of Vegetation (NDVI) is negatively correlated with LST. The trend of LST and LC transitions indicates that LST will be abruptly increased in near future. The urban LST maps, the analyses of thermalland cover relationships and the spatial simulated results thus obtained could be used as strategies for quality improvement of urban environment and a smart solution to the reduction of Urban Heat Island (UHI) effect. © Springer-Verlag Berlin Heidelberg 2013.