Question about SDTS format
- To: mathgroup at smc.vnet.net
- Subject: [mg102882] Question about SDTS format
- From: "Elton Kurt TeKolste" <tekolste at fastmail.us>
- Date: Tue, 1 Sep 2009 03:52:49 -0400 (EDT)
- References: <200908311033.GAA06953@smc.vnet.net>
The files on the US Government website nationalatlas.gov (http://nationalatlas.gov/mld/statesp.html) claims to have files in SDTS format. In particular, I have downloaded and decompressed the files for the state data, but Mathematica cannot import them. For example, after downloading: In[519]:= Import["Z:\BIGSIGMAA\Data\STAPAPPC.DDF"] During evaluation of In[519]:= Import::fmterr: Cannot import data as SDTSDEM format. >> Out[519]= $Failed It will read the "Element" field: In[533]:= elements = Import["Z:\BIGSIGMAA\Data\STAPAPPC.DDF", "Elements"] Out[533]= {"Centering", "CentralScaleFactor", "CoordinateSystem", \ "CoordinateSystemInformation", "Data", "DataFormat", "Datum", \ "ElevationRange", "Graphics", "GridOrigin", "InverseFlattening", \ "LinearUnits", "Projection", "ProjectionName", "RasterSize", \ "ReferenceModel", "SemimajorAxis", "SemiminorAxis", "SpatialRange", \ "SpatialResolution", "StandardParallels"} But not any of the elements In[534]:= map = Import["Z:\BIGSIGMAA\Data\STAPAPPC.DDF", #] & /@ elements During evaluation of In[534]:= Import::fmterr: Cannot import data as SDTSDEM format. >> During evaluation of In[534]:= Import::fmterr: Cannot import data as SDTSDEM format. >> During evaluation of In[534]:= Import::fmterr: Cannot import data as SDTSDEM format. >> During evaluation of In[534]:= General::stop: Further output of Import::fmterr will be suppressed during this calculation. >> Out[534]= {$Failed, $Failed, $Failed, $Failed, $Failed, $Failed, \ $Failed, $Failed, $Failed, $Failed, $Failed, $Failed, $Failed, \ $Failed, $Failed, $Failed, $Failed, $Failed, $Failed, $Failed, \ $Failed} I can think of three possiblities: 1) I ammisusing Mathematica 2) Mathematica does not actually import SDTS files as advertised 3) The government did not publish this data in SDTS format despite the data suffix. Does anyone have any hints as to how to import SDTS data or information about the formats used by the government?' Regards, Kurt Tekolste