In Remote Sensing and Geographical Information Systems (GIS) Addis Ababa University, Addis Ababa, Ethiopia
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Date
2007-07
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Addis Ababa Universty
Abstract
The rapid urbanization and urban expansion in the developing world require a scientific
understanding of complex urban growth patterns and processes. This knowledge is highly crucial to
sustainable land management and urban development planning. Progress in modern Remote
Sensing and GIS techniques have opened up great opportunities, and significant success has already
been achieved in monitoring and managing fast urban growth.
This study focuses on mapping urban expansion and site suitability analysis for housing in Adama
city. It analyzes the cause and its direction of expansion. The basic data used are topographic map
(1:50,000), Aerial photographs of the city of (1965 and 1972), IKONOS image of the city (2004)
and GIS data layers like Road, railway, River, Population, Land use, slope and Soil. It has been
found that the built up area expansion of the city between 1965 and 1972 was 120 hectare which
was 48% expansion and the built up area expansion of the city between 1972 and 2004 was 704
hectare which was 290.3% expansion.
The road length of 1965 and 1972 was calculated out as 41.1 km and 72 km respectively .Hence the
road was increased by 30.9 km (54.8%) between 1965 and 1972. Moreover, the road length of 2004
was measured as 160.3km. The road network expansion of Adama city from 1972-2004 was
increased by 88.3km. This attempt has also been made to propose new sites for housing expansion
based on local and other countries criteria’s using seven parameters, Land use, population density,
road, railway, river, and slope. Using ArcGIS 9.1 of spatial analysis weighted overlay analysis have
been carried out by giving weights for each parameter using pair wise method and produce new
sites for housing . Once suitability for housing expansion has been completed sites were evaluated
with respect to the availability of utilities like electric, telecommunication and water supply
utilities, to support the proposed sites to be more comfortable and safe in terms of these basic
infrastructures.
The study strongly supports the usefulness of advanced technologies like Remote Sensing and GIS
for Urban expansion study and selection of best sites suitable for housing expansion based on
certain criteria.
Key Words: Urban Expansion, Remote sensing, Geographical Information System, Multi criteria
analysis (MCA) and Housing Site Selection
Description
Keywords
Urban Expansion, Remote sensing, Geographical Information System, Multi criteria analysis (MCA) and Housing Site Selection