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USGS Contour Service RPC API - SDKs

The USGS Contour Web Service creates a vector shapefile of contours for the desired area, which the user inputs in terms of latitude and longitude. If desired, the user may also choose the contour interval and units and a name for the resulting shapefile. The generated files are packaged in one zipfile and placed on the USGS webserver where they are publicly available. This service returns a URL that can be used to obtain the finished file.
USGS Contour Service