Mapping of Major Urban Green Spaces and Study the Accessibility Using Network Analysis in Addis Ababa City, Ethiopia
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Date
2023-06
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Addis Ababa University
Abstract
Cities in developing countries are growing rapidly. As a result of uncontrolled urban expansion and population growth urban green spaces are deteriorating at an alarming rate. The aim of this study is to assess the status of major urban green spaces and to study their accessibility using GIS based network analysis approach. OBIA (Object Based Image Analysis) classification algorithm is used to map and assess LULC (land-use and land-cover) of the study area. Remote sensing indices such as NDVI (Normalized Difference Vegetation index) and NDBI (Normalized Difference Built-up Index) have also been used to depict the vegetation cover and urban expansion rate which has direct influence on the deterioration of UGSs (urban green spaces). The accessibility analysis was carried out to study the spatial distribution and availability of public recreational parks existing in Addis Ababa city. Three accessibility indicator standards are used. The result shows that the accessibility of public parks are inadequate and their distribution are uneven. The central part of city has a little denser park concentration whereas, the eastern and southern part of the study area doesn’t have park facility except the Kality Park located in Akaki sub-city. The network analysis was computed based on residential area coverage and population number enjoying the park facilities. In addition, the current demand of public parks required by the population were assessed. Very low accessibility of parks are recorded for 300 and 800 meter service areas. The 300 m service area serves only 6 % of A.A residential area. Whereas, the 800m SA serves 34 % of the city residential area. Moreover, the population residing in Addis Ababa that enjoys public parks is 7 % for 300 m and 35 % for 800 m service areas. The 300 meter service area refers to 4 minute walking distance whereas the 800m refers to 4 minute walking distance. Therefore, urban residents are forced to walk more than 10 minutes in-order to enjoy park facilities. In addition to the international standards, national accessibility indicators recommended by AACC, is also included in this research. The AACC recommends city parks to be accessed within 10km radius and Sub-city parks in 5km radius. The study finding shows that 70% of residential area access sub-city parks. Moreover, the recorded value of residential area served by city parks is 87 % for all existing sub-cities. In addition, this study demonstrates 72 % of A.A resident’s reside with 5 km radius service area. While the population enjoying 10 km SA of City Park is 80 percent.
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Keywords
RS, GIS, LULC, NDVI, NDBI, UGS, Public Park, Accessibility