Urban Land Use Land Cover Change and its Effects on Land Surface Temperature: the Case of Yeka, Bole and Akaki-Kality Sub Cities
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Date
2018-06-05
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Addis Ababa University
Abstract
This research is about the impact of urban land use land cover change on land surface temperature in Yeka, Bole and Akaki-kality Sub-City of Addis Ababa. The study examined the change of land use land cover in the past 20 years and analyzes its effect on the land surface temperature in the years 1998, 2010 and 2017 by applying remote sensing and GIS technologies. The LULC map of the study years was developed using Landsat image using support vector machine algorithm of supervised classification through ENVI 5.3 software and the land surface temperature was retrieved using the thermal band of Landsat image which was band 6 and band 10 for landsat 5 and 8 respectively. The study also examined different residential areas urban morphology types of land surface temperature. The UMT are condominium, villa and mud house. These UMT are extracted by digitizing from the Google earth explorer and converting into shape file using Arc GIS 10.3 software and the land surface temperature of each urban morphology type polygon were computed in zonal statistics using LST map of the study area. The result indicated that the study area is under extensive land use land cover change in the past two decades and showed that the land cover class of farm land /bare land declined by 34.20% whereas built-up increased by 28.70% respectively. Even if the vegetation is the smallest portion of the study area it shows a slight increment by 5.50%. The mean land surface temperature of the study area showed an increment from the period of 1998 to 2017 by 2.200C and among the land use land cover categories the built-up LST showed an increasing trend. The residential urban morphology types have a significant mean LST difference and the mean NDVI value of the UMT were-0.0726 (condominium),-0.0186 (villa) and -0.0388 (mud house) respectively. Average mean land surface temperature of the condominium has the highest than the other UMT because of its lowest NDVI value. Therefore, future expansion or urbanization without proper urban planning or management and considering environmental perspective, it will accelerate the modification of local climate and development of UHI. Therefore, any development activities should take in to account the future environmental condition of the area in order to make the environment suitable for living.
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Keywords
Land Use Land Cover, Urbanization, Land Surface Temperature, Gis, Remote Sensing, Urban Morphology Type