Dear Community:

I would like to cut a polygons, according to their elevation, into two parts
(upper and lower parts). The polygon might be convex or concave, and the
elevation to cut might vary for each polygon. The contour line has an
interval of 5m, and the cutting elevation is integer, which means I might
need to generate a contour layer with much condensed lines, e.g, 1m
interval. Any idea on how to do it, better in R, or in ArcGIS?

Thanks in advance~

Marco

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Ph.D candidate,
Chinese Ecological Research Network,
Institute of Geographical Sciences and Natural Resources Research,
 Chinese Academy of Sciences,
100101, Beijing
Tel: (86)-10-6488 9809

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