idea how to use gps data to perform image rectification? Thanks for
any information on this subject!
Charles
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Hello all,
I have a quick question about digitizing vector using GRASS. Can a
pen tablet be used instead of a mouse when digitizing vectors?
Thanks for any input!
charles
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portion, cut and possibly use
v.patch to combine different map sections. Is there an easier way
this could be carried out?
Thanks for any techniques you have to offer.
Charles
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dvance,
charles
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Thanks Markus for the help and all who responded. I will try it.
ch
On Aug 30, 2008, at 12:26 AM, Markus Neteler wrote:
Charles,
On Sat, Aug 23, 2008 at 10:38 PM, charles <[EMAIL PROTECTED]>
wrote:
Hello all,
I have purchased to book, Open Source Grass, the third edition and
wan
It is also possible that the region was not set to the geographic
coordinates of the dem or slope map when performing the r.mapcalc.
r.slope.aspect is one of the few programs to default to extent and
resolution of the original map, not the current region.
Chuck Ehlschlaeger, Associate Professor of
r.mapcalc contains all the functionality to perform these types of analyses.
See "r.mapcalc: An Algebra for GIS and Image Processing," by Michael Shapiro
and Jim Westervelt, U.S. Army Construction Engineering Research Laboratory
(March/1991), whose link is located at the bottom of
http://grass.itc
How many rows and columns are in the input map? Also include the exact
command line statement you use to run the program.
Sincerely, chuck
Chuck Ehlschlaeger, Geospatial Science Consultant
PERTAN GROUP, http://pertan.com/
[EMAIL PROTECTED], 309-255-2727
http://chuck.ehlschlaeger.info/
-Orig
The important question is: "What is the purpose of the centerline?" Is the
centerline supposed to indicate which side of the SBDRs the land belongs on?
Or is the centerline supposed to divide the SBDRs watershed in half? Maybe
there are other purposes. If it is the first purpose, I recommend:
1) Ge
Dear Markus and other r.watershed enthusiasts,
I've thought of a way to make your faster version of r.watershed give
identical results as the older r.watershed. r.watershed.old uses a breadth
first search in section 2. r.watershed.fast is breadth first . The trick would be to slightly adjust DEM va
q is visible if the gradient from q-to-v is the
maximum of all point's gradients on the way to v from q), but that doesn't
seem to be the case for r.los. Is there a quick simple explanation of how it
works? It's not in the documentation...
thanks a lot!
Jul
s
projection file and the other doesn't
If anyone can shed any light on the process to do this with GRASS or any
other Open Source applications it would really be appreciated.
Regards,
Charles Deaton
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