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Re: Question about SDTS format

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102926] Re: [mg102882] Question about SDTS format
  • From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
  • Date: Wed, 2 Sep 2009 04:04:26 -0400 (EDT)
  • References: <200908311033.GAA06953@smc.vnet.net>

Hi,


> Are there SDTS tools available for Mathematica that you know of?

Sorry, I don't know. I just checked your approach and recognized you
unpack the files but I never used the stuff by myself.

Cheers
Patrick


> Kurt
> 
> 
> On Tue, 01 Sep 2009 14:03 +0200, "Patrick Scheibe"
> <pscheibe at trm.uni-leipzig.de> wrote:
> > Hi,
> > 
> > don't unpack the tar.gz files. Just do something like
> > 
> > Import["blub.tar.gz", {"SDTS", "Graphics"}]
> > 
> > Cheers
> > Patrick
> > 
> > On Tue, 2009-09-01 at 03:52 -0400, Elton Kurt TeKolste wrote:
> > > 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
> > > 
> > > 
> > 
> Regards,
> Kurt Tekolste
> 



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