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41. SATELLITE DERIVED ESTIMATE OF LAND SURFACE TEMPERATURE AND THERMAL RADIATION HUMAN HEALTHIMPLICATIONS FOR AKURE, ONDO STATE, NIGERIA. by A.O. Oluwadare, E.J. Oluwadare, and S. Fagbemi Volume 50 (March, 2019 Issue)
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SATELLITE DERIVED ESTIMATE OF LAND SURFACE TEMPERATURE AND THERMAL RADIATION: HUMAN HEALTH IMPLICATIONS FOR AKURE, ONDO STATE, NIGERIA.

A.O. Oluwadare1, E.J. Oluwadare2, and S. Fagbemi3

EJIT Energy, Akure, Ondo State, Nigeria.

Department of Physics, AjayiCrowther University Oyo, Oyo State, Nigeria.

Public Health Department, Ministry of Health, Akure, Ondo State, Nigeria.

Abstract

The spatial distribution of land surface temperature (LST) and thermal radiation, estimated from remote sensing data, had been used to study the effect of urban heat island on human health. Increase in LST and thermal radiation had been known to have serious health implications on human. Therefore the constant evaluation and adequate information on the extent of the change in LST and thermal radiation from remote sensing data for a given region is crucial for public health and environmental epidemiology as it assist both emergency response planners and public health specialists in identifying areas that are most at risk and using these scientific findings to improve the health of the populations living within the affected areas. 

Remote sensed data obtained from Landsat Thematic Mapper (LANDSAT 7) image of2002as well as the Operational Land Imager and Thermal Infrared Sensor (LANDSAT 8)images of 2014 and 2018 were used to estimate the spatial distribution of Land surface temperature and thermal radiation of Akure, Ondo State, Nigeria. Fast growing urbanization and alteration of the vegetation cover and other natural surfaces of Akure contributed to increased land surface temperature and surface thermal radiation. It was also noticeable that the areas with higher surface temperature corresponded with areas that had low vegetation cover. Also, areas with lower surface temperature correspond with areas that have high vegetation. The average LST of the built-up area for the years considered are 30.5° C, 33.2° C and 33.8° C for year 2002, 2014 and 2018 respectively, having percentage increase of 9% (2002 – 2014) and 11% (2002 -2018). It was also observed that the spatial distribution of the thermal radiation followed the same pattern with that of the spatial distribution of land surface temperature. Regions with higher land surface temperature emitted more thermal radiation than the regions with lower land surface temperature. It was observed in the study that development in the urban area contributed to the increased of land surface temperature in the study area by 3.3°C within the years considered.  The study shows the usefulness of remote sensing data and GIS approach in evaluating LST and thermal radiation in the rapidly developing region, Akure, Ondo State from the year 2002 to 2018. 

Keywords: Land surface temperature, thermal radiation, LANDSAT.

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