Revision of Built-up Areas in a Gis Using Satellite Imagery and Gis Data
نویسنده
چکیده
In general, built-up areas or populated places are significantly changing within the revision interval of a GIS (Geographic Information System) or map. In this paper we present a method by means of which built-up areas are extracted from panchromatic satellite images of SPOT and IRS-1C and which makes use of the available information about built-up areas in the GIS. The method has been developed for small-scale maps or GIS where built-up areas are represented by their outline stored as a closed polygon. The texture of built-up areas in satellite images is characterized by a high spatial density of very short linear features. This density is used to classify built-up and non-built-up areas. The decision is made by a threshold estimated from training sites which are derived from the built-up areas stored in the GIS. The suitability of the method is demonstrated using SPOT and IRS-1C data as examples.
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