Abba City Case Study

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CHAPTER FOUR 4. Results and Discussion 4.1 Change Detection Land-use/cover maps were produced for the year 1984, 1995, 2006, and 2016 (Fig 4.1). These maps show built-up area with purple color shows built-up area, the light yellow is agricultural area, the light red color is barren land/open space, the green color shows green areas and finally the water body is represented in blue color. The change in areal coverage for each category from 1984 to 2016 is clearly visible on the maps. At the beginning in 1984, Addis Ababa city occupied only small area at the center of the study area and surrounding Oromia towns were almost non-existent. The result also shows that there was no much change in years between 1984 and 1995 but the city began…show more content…
The map shows that the expansion of the city from 1984–2006 for about 20 years indicated in yellow and green colors is smaller than the expansion of the city from 2006 –2016 in the past 10 years. The expansion of built-up area in 2016 is very special in that it covered the study area wall to wall and increased by a large amount of land which indicates rapid and unprecedented urban growth of the city consuming the surrounding non-built-up areas. This type of urban growth is a typical urban sprawl increasing in all direction. Fig 4.1 Land-use types of Addis Ababa city and surrounding towns from 1984–2016. Fig 4.2 Overlaid built-up area of Addis Ababa city and surrounding towns from 1984–2016. In addition to representing the change in maps, the total area (ha) covered by each category and its percentage in the landscape was also calculated in FRAGSTATS to quantify the amount of change (Table 4.1). FRAGSTATS calculates the total area of each category as Class Area (CA) in hectares and the percentage as Percentage of Landscape (PLAND) for each year. These are the two major spatial metrics that measure spatial composition of a categorical map at landscape level. Table 4.1, Total amount of land in hectares for each category from 1984–2016. Land-use 1984 1995 2006 2016 Area % Area % Area % Area % Built-up A. 12,218
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