Re: Question about SDTS format
- To: mathgroup at smc.vnet.net
- Subject: [mg102920] Re: [mg102882] Question about SDTS format
- From: "Elton Kurt TeKolste" <tekolste at fastmail.us>
- Date: Wed, 2 Sep 2009 04:03:21 -0400 (EDT)
- References: <200908311033.GAA06953@smc.vnet.net>
Patrick
Thank you. Worked like a charm -- except that I had to unravel the
contents and figure out how to use the data for an overlay from the
formatting.
Are there SDTS tools available for Mathematica that you know of?
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