Grass 5.0b7 + NVIS2.2 = WOW!

GRASS GRASS user
1

I finally got NVIZ running on my machine here, and I
just wanted to say, WOW! You all have done a lot of
excellent work in getting grass together, and NVIZ is
a great visualization tool. I'd consider myself a
"recreational" grass user, primarily plotting handheld
GPS data against topo maps just to see where the trails
go. I just plotted a trail (highway 160 in Colorado,
actually) using nviz, and my jaw just dropped. Thanks
to all those who have helped to get this together.

I have a question, though. For raster format elevation
data, I'm working off of 7.5min USGS dems. Is there an
easy way to merge neighboring raster maps without losing
too much resolution? I've tried using the CELL driver,
but the resulting raster data loses a lot of the contour
of the original data. Is there a better method available?

P.S. I'll take beta7 for another spin on the SGI when I
get the chance.

-- ebm
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
| Eric B. Mitchell mailto:emitchell@altaira.com |
| tel: (301) 809 - 3534 Altair Aerospace Corporation |
| tel: (800) 7 - ALTAIR 4201 Northview Dr. Suite 410 |
| fax: (301) 805 - 8122 Bowie, MD 20716 |
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
              ,___
          /"\ / o=\ /"""---===/
         / \_/ \__/ ---===/
         | //\ || /""TT""/ //\ || ||""\
         | // \ || || // \ || ||__/
         | //--==\ |L--/ || //--==\ || || "=,
          \ ---===/
           \____---===/

2

Eric,
Set your region to encompass both quadrangles (g.region). Then, run
r.patch to patch the two DEMs together (r.patch in=dem1,dem2
out=newdem). The color table will be lifted from the first map patched.
You may have a very slight gap between the DEMs; we'll cross that bridge
later if you have that problem :slight_smile:

Best regards,
  -Malcolm

Malcolm D. Williamson malcolm@cast.uark.edu
Center for Advanced Spatial Technologies Voice: 501-575-2734
12 Ozark Hall Fax: 501-575-5218
University of Arkansas, Fayetteville AR 72701
http://www.cast.uark.edu/

Eric Mitchell wrote:

(lines deleted)

I have a question, though. For raster format elevation
data, I'm working off of 7.5min USGS dems. Is there an
easy way to merge neighboring raster maps without losing
too much resolution? I've tried using the CELL driver,
but the resulting raster data loses a lot of the contour
of the original data. Is there a better method available?

P.S. I'll take beta7 for another spin on the SGI when I
get the chance.

-- ebm
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
| Eric B. Mitchell mailto:emitchell@altaira.com |
| tel: (301) 809 - 3534 Altair Aerospace Corporation |
| tel: (800) 7 - ALTAIR 4201 Northview Dr. Suite 410 |
| fax: (301) 805 - 8122 Bowie, MD 20716 |
+=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=+
              ,___
          /"\ / o=\ /"""---===/
         / \_/ \__/ ---===/
         | //\ || /""TT""/ //\ || ||""\
         | // \ || || // \ || ||__/
         | //--==\ |L--/ || //--==\ || || "=,
          \ ---===/
           \____---===/