Geodesy and Geomatics

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Browsing Geodesy and Geomatics by Subject "Addis Ababa City"

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    Predicting Future Urban Land Surface Temperature from Spatio-Temporal Land Use Land Cover Dynamics: A Case of Addis Ababa City and Surroundings, Ethiopia.
    (Addis Ababa University, 2021-01) Wendwesen, Taddesse; Binyam, Tesfaw (PhD)
    Although several studies were conducted on modeling future land use land cover (LULC) change in Ethiopia, predicting future urban land surface temperature (LST) from LULC dynamics is less common. The objective of the study was to predict the future LST of Addis Ababa city and its surrounding area from LULC dynamics. Four Landsat (TM, ETM+, and OLI-TIRS) images were used to extract and map LST and LULC distribution for the years 1991, 2002, 2011, and 2020. The performances of several land cover indices (LCI) to predict LST were assessed. CA-Markov chain analysis was applied to predict the LULC and LCI of 2050. The regression analysis was applied to project the future LST from LCI. The finding of the study indicated that the NDBI was the top selected for the prediction of the future LST with the highest correlation(R = 0.72). LST was predicted from NDBI with a mean absolute percentage error(MAPE) of 9.4%. The LULC changes between 1991 and 2020 showed that the built-up area was increased by 38000 ha whilst the water bodies, agriculture, and vegetation areas were decreased by 172 ha, 26905 ha, and 10920 ha, respectively from 1991 to 2020. Between 2020 and 2050, the coverage of the built-up area was predicted to increase by 26013 ha while the area coverage of water bodies, agricultural land, and vegetation area was predicted to decrease by 16 ha, 19133 ha, and 6864 ha, respectively. Between 1991 and 2020, the area coverage of the lowest LST range (10 –20 ⁰C) was decreased by 14728 ha while the area covered by the highest LST range(34 – 45 ⁰C) was increased by 16051 ha. The predicted LST result from NDBI showed that the lowest category was predicted to decrease by 544ha while the highest category was predicted to increase by 3353 ha from 2020 to 2050. And hence it was concluded that the rise of LST will continue in the future due to the LULC changes and global climate warming unless properly mitigated.
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    Remote Sensing Based Microclimate Change Study in Clustered Industrial Areas of Addis Ababa City.
    (Addis Ababa University, 2018-10) Kemal, Husen; Degefie, Tibebe (PhD)
    Microclimatic warming is the major effect of industrial expansion in urban areas like Addis Ababa. Monitoring of microclimatic warming at local scale is very required to take proper decision. However, microclimatic warming with respect to recent industrial development in Addis Ababa city is not yet investigated. Thus, in this study multi temporal Landsat satellite images are used to evaluate the spatio-temporal trend of microclimate warming in urban areas of Addis Ababa. Thermal infrared and near infrared portion of the electromagnetic spectrum of Landsat satellite imageries are employed to compute land surface temperature which is used as a warming indicator of microclimatic warming. Landsat imageries which were taken up during 1985 G.C to 2018 G.C are considered in this study. Apart from satellite imageries, temperature data from ground station is obtained from National Meteorological Agency of Ethiopia. This data is used to evaluate against satellite derived land surface temperature. Result from this study shows that in general temperature in Addis Ababa has been increased in the last 33 years and this particularly exhibited in clustered industrial zones of the city whereby the rate of temperature increment is higher compared to the whole city. This clearly indicates that the association of industries expansion and temperature rise is directly associated. Based on this information, solutions are suggested to manage the effect of industrial expansion on local microclimatic warming.