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My purpose: getting out area between elevation contours (like b/w 600m and 700m). The contours could either be elevation ones or the basement contours. I got elevation contours using spatial analyst tool on DEM in ArcMap but they are in the form of polyline and highly dense. I need it for entire Maharashtra, India. Also "seismotectonic atlas of India" don't have basement contours of Deccan region.

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Try this tool box. It has a tool that allows you to create filled contours, from which you can easily work out areas.

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