[postgis-users] DEM models

[Nicolas Ribot]

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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