[postgis-users] DEM models

[Ed Linde]

I have no idea how to use GDAL to load in the SDTS .DDF files. Are you
saying I
have to write C/C++ code to do this or are you suggesting a way I could
import
this into postgis and get the raw co-ordinates?

On Fri, Sep 7, 2012 at 10:08 AM, Nicolas Ribot <nicolas.ribot at gmail.com>wrote:

> Hi,
>
> GDAL seems to handle the format:
> http://www.gdal.org/frmt_various.html#SDTS.
> (format specs: http://mcmcweb.er.usgs.gov/sdts/sdtsfaq.html)
>
> So it could be converted into a postgis raster, or processed directly
> with GDAL/OGR.
>
> Nicolas
>
> On 7 September 2012 09:53, Ed Linde <edolinde at gmail.com> wrote:
> > Hi All,
> > I just downloaded a DEM file from geocomm.com, and its in a format that
> I do
> > not understand, I want to do a Delaunay triangulation on it to generate a
> > TIN.
> > I was wondering if someone here knows how I can go about getting the raw
> > x,y,z co-ordinates so I can go about triangulating this dataset? I know
> many
> > of
> > you might work with DEM and Raster datasets, so I thought I would ask
> here.
> > Some details below about the dataset that came in the .TXT file with it.
> It
> > was a ".DEM.SDTS.TAR.GZ" file which I untarred and it created a whole
> bunch
> > of
> > .DDF files. Any idea what I can do with these?
> >
> > Thanks,
> > Ed
> >
> > ITEM_TYPE: SDTS DEM - 7.5X7.5 GRID
> > CELL_NAME: Bearhead Mountain
> > STATE: WA
> > MRC_CODE: 47121-A7
> > BEST_AVAILABLE: T
> > SALEABLE: T
> > DATA_LEVEL: 2
> > X_RESOLUTION: 30
> > Y_RESOLUTION: 30
> > XY_UNITS: Meter
> > Z_RESOLUTION: 1.000
> > Z_UNITS: Meter
> > ORIG_LOAD_DATE: 13-SEP-01
> > CREATE_DATE: 13-SEP-01
> > PUBLICATION_DATE: 17-SEP-01
> > SOURCE_DATE: 1979
> > INSP_REV_DATE: 1997
> > INSP_REV_NAME: Inspection
> > HORIZONTAL_DATUM: North American Datum of 1927
> > PROJECTION: Transverse Mercator
> > ZONE: 10
> > VERTICAL_DATUM: NGVD 1929
> > DIGITAL_FORMAT_SPEC: DEM SDTS (Part 5: Raster Profile and Extensions
> (RPE))
> > STANDARDS_NAME: Standards for Digital Elevation Models 1995 Header with
> > Pre-1995 Content
> > PROCESS_STEP: DLG/Hypsography LINETRACE, LT4X Complex Linear
> > MIN_ELEVATION: 444
> > MAX_ELEVATION: 1859
> > SUSPECT_VOID: 0
> > PERCENT_VOID: 0
> > LARGE_CONTOUR_INT:
> > SMALL_CONTOUR_INT: 40
> > CONTOUR_UNITS: Foot
> > RMSE: 1
> > SAMPLE_SIZE: 30
> > NORTH_LATITUDE: 47.125000
> > SOUTH_LATITUDE: 47.000000
> > WEST_LONGITUDE: -121.875000
> > EAST_LONGITUDE: -121.750000
> >
> >
> >
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> >
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