SDTS file conversion

[Eric Mitchell]

I have no problem converting SDTS format USGS dem and dlg data
under linux.  I don't use the sdts2dem program, though. I use 
sdts2arc, and import that data into grass via r.in.ascii.
Details on how this may be accomplished can be found at:
http://www.baylor.edu/~grass/faq/importing_usgs_7_5min.html

This page includes the patches required for proper operation 
on case-sensitive filesystems, and a sample Makefile for the
sdtsutils package.

Now that I take a closer look at your compile line, it looks 
like you're using that makefile, and have a typo in the rule.
The line should read:
	gcc -o $@ $@.c -Wl,/usr/local/lib/libfips123.a
Note the space between the $@'s.

Try changing that, and letting me know how it goes.

Skip wrote:
> 
> I am having some difficulty converting sdts files to a format GRASS can use. I about every document/e-mail//help file I can find on converting sdts files but have run into a few snags. So far the only workable solution I have found is converting the files using sdts2dxf.exe within winNT. I tried using sdsts2dlg.exe in combination with dlgbld.exe and dosmsf.exe but dlgbld bombs. Sdts2dlg seems to work fine. I could stick with using sdts2dxf but I've run into problems with importing some converted files into GRASS. Oh, I also tried Microdem in winNT but it also bombs.
> 
> I'd really like to be able to convert the files within linux. I had hoped to get the DEM data conversion working properly but I can't get the sdts utils to compile. I read the document discussing how to import USGS 7.5min DEM data into GRASS. I downloaded the proper files and followed the procedures for compiling the files. The fips library files compile without a problem; however, when I try to compilie the sdts utilities I get the following error message:
> 
> gcc -o demoutdemout.c -Wl,/usr/local/lib/libfips123.a
> /usr/lib/crt1.o(.text+0x18): undefined reference to `main'
> collect2: ld returned 1 exit status
> make: *** [demout] Error 1
> 
> Is there a trick to getting these utilities to compile? What other options are available in linux  to convert sdts files into a format GRASS can use?
> 
> This seems to be an ongoing problem with very limited documentation on the GRASS website.
> 
> Skip
> 
> =================================
> Skip Haak
> Natural Resource Solutions
> 950 Lloyd Center, Suite 48
> Portland, OR 97232
> Office: (503) 460-3198
> Mobile: (503) 998-3267
> Facsimile: (503) 460-3230
> E-mail: shaak at teleport.com

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+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
| Eric B. Mitchell         mailto:emitchell at altaira.com |
| tel: (301) 809 - 3534    Altair Aerospace Corporation |
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