[GRASSLIST:1191] Re: SDTS support on grass5

Malcolm Williamson malcolm at cast.uark.edu
Sun Nov 26 17:37:08 EST 2000

The BLM converter "sdts2dem.exe" works just fine on Windows machines; my
solution is to convert from SDTS to DEM under Windows, then copy the
files to my UNIX box. Look under ftp://ftp.blm.gov/pub/gis/sdts/dem/old/
for the zip file containing the executable. I'm not sure which version
is most robust. I have been using the output with GRASS 4.1, 4.3, and

	-Malcolm Williamson
	 CAST - University of Arkansas

Ivan Kautter wrote:
> List members,
> I have heard that grass5 supports the SDTS format yet I see little evidence
> of that on the maunal pages when it comes to raster formats data such as
> DEM.  While there seem to be commands for reading USGS data formats which
> may be compliant with the SDTS format, the conversion process to the GRASS
> compatible DEM is less than transparent.  I have seen various examples on
> how to convert SDTS to GRASS including SDTS utilies offered by the BLM which
> would not compile (there has been little concrete assistance offered by this
> listserv or any other on this issue) and the often quoted conversion process
> for 240K 7.5 min UGSS DEMs with 30 meter resolution involving m.read.USGS
> and conversion to ascii format and 90 degree rotations etc.  to GRASS (which
> I can no longer seem to locate) but not for 100K 7.5 min USGS DEMs with 10
> meter resolution as well as m.dem.extract which may or may not be present on
> GRASS 4.3 which I am running.
> Can anyone offer some concrete suggestions on how to deal with SDTS format
> data?  Should I just switch to grass5 and if so, what specifically is the
> support offered for this format on grass5?  Additionally, if grass5 is
> configured for floating point operations, does one need a CPU that supports
> those type of operations to run grass5.  I have a fairly standard Pentium
> III processor.  Is that sufficient?
> Sorry for the barage of questions but I have been trying for some weeks to
> resolve this issue and have found no suitable solutions offered anywhere.
> Please help and thank you for your time and efforts.
> Ivan
> _____________________________________________________________________________________
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