trying to Import USGS-resident DEM data
- To: mathgroup at smc.vnet.net
- Subject: [mg83366] trying to Import USGS-resident DEM data
- From: congruentialuminaire at yahoo.com
- Date: Sun, 18 Nov 2007 04:52:45 -0500 (EST)
Hello Mathematica UG: I am trying to Import and ReliefPlot the DEM data resident on the USGS site using the following statment: Import["http://bard.wr.usgs.gov/bard/dem/dems24k/sfbay_10meter/ gzip_dems/sf_north.dem.gz", "ColorFunction" -> "DarkTerrain", "DownsamplingFactor" -> 4] This command only dumps out large numbers of points (i.e. no plot). I attended the V6 Import/Export session taught by Wolfram where the following command was demonstrated and works on my system: Import["ExampleData/hailey.dem.gz", "ColorFunction" -> "DarkTerrain", "DownsamplingFactor" -> 4] Other parameters we learned in the class apparently work (such as "Elements" and "Data"). I did notice that "SpatialRange" emits this error message: Import::noelem: The Import element "SpatialRange" is not present when importing as Text. Has anyone else had any experience trying to accomplish this type of Import? Can this command be made to work? TIA. Regards..Roger W.