Is there a way to create contour map from a given shaded relief map?

closed as unclear what you're asking by neogeomat, ahmadhanb, BERA, Ian Turton May 30 '18 at 9:08

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    There could be a way but not reliably and certainly not without a great deal of effort, reverse engineering relief shade to elevation and thence to contours.. you might be better served downloading SRTM DEM and generating contours from that but don't expect a contour interval of less than 10 metres over 1 arcsecond and 30 metres over 3 arcsecond areas. – Michael Stimson May 30 '18 at 1:49
  • IF I have the SRTM DEM data, how can I extract the contour data? Can ArcGIS be used? – PaoGIS May 30 '18 at 2:59
  • With ArcGIS you will need 3d analyst or spatial analyst extension using the tool Contour (3d) resources.arcgis.com/en/help/main/10.2/index.html#//… or Contour (sa) resources.arcgis.com/en/help/main/10.2/index.html#//… if you don't have either spatial or 3d analyst you can use GDAL_Contour gdal.org/gdal_contour.html. The GDAL contours are a little more engineering than Esri contours; you can smooth the GDAL contours by resampling with GDALWarp with cubic to half the cell size. – Michael Stimson May 30 '18 at 3:13