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Therefore, the cartographer should know a great deal about the disciplines covered by the maps in order to satisfy the user's demand correctly. It requires knowledge, skills and experience to express the essential characteristics of spatial data in terms of a map. Geographers represent only one group of map user. Scientists, engineers, and social scientists etc, also see the map as a valuable way to organise and express ideas. As a result of this, cartographers have to be sensitive to the mapping needs of diverse fields (ROBINSON et al. 1995)