Re: Question about SDTS format
- To: mathgroup at smc.vnet.net
- Subject: [mg102897] Re: [mg102882] Question about SDTS format
- From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
- Date: Wed, 2 Sep 2009 03:59:14 -0400 (EDT)
- References: <200908311033.GAA06953@smc.vnet.net>
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
>
>