Assessment of Urban Heat Island Using Remotely Sensed Imagery over Greater Cairo, Egypt

Abstract

The Urban Heat Island (UHI) results in significant and sometimes dramatic increases in air temperature differences between the urban environment and its surrounding areas. The heat island structure may extend from the ground to the top of roofs and canopy levels above ground. The Urban Heat Island effect is a leading factor in a long list of human health problems which are expected to increase with the rapid growth of urban populations and projected future climate change. Urban heat island studies can be conducted through either direct measurements of air temperature using automobile transects and weather station networks or through measuring surface temperature using airborne or satellite remote sensing. In this study, UHI was investigated over the Greater Cairo during both summer and winter seasons over two different dates. Landsat 7 ETM+ data were used and the mono-window algorithm was applied in the study. Results emphasis that both types of heat islands exist in the study area i.e. the surface and the atmospheric heat islands. Temperature differences ranged between 0.5°C to 3.5°C and these are much related to the existing land use/covers. It could be concluded that expansion of urban areas in Greater Cairo has led to increased thermal radiation of land surface on the highly populated areas.

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Abutaleb, K. , Ngie, A. , Darwish, A. , Ahmed, M. , Arafat, S. and Ahmed, F. (2015) Assessment of Urban Heat Island Using Remotely Sensed Imagery over Greater Cairo, Egypt. Advances in Remote Sensing, 4, 35-47. doi: 10.4236/ars.2015.41004.

Conflicts of Interest

The authors declare no conflicts of interest.

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