Low-cost map overlay analysis using computer-aided design

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Abstract
There are two approaches to the development of a mapping and planning software system for use in the regional planning offices of the developing countries: (1) a turnkey system approach which uses a single integrated package for data entry, file management, analysis, and graphics; and (2) the linked system approach which uses a loosely integrated framework built around existing data-base and graphics packages. The paper gives a progress report on a project first developed for decentralized regional planning in Asia that uses the linked systems approach by combining commonly available packages in data-base management and computer-aided design (CAD) through a set of linker programs. An exercise in map overlay analysis is described which uses land-use patterns in southern Sri Lanka. The principal reason for adopting this approach is the logic of appropriate technology. It uses the informal infrastructure that already exists in the Asian cities in the use of computer software to develop planning tools that can be locally supported and extended by the users.

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