[GRASS-user] i.points gps

idea how to use gps data to perform image rectification? Thanks for any information on this subject! Charles ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user

[GRASS-user] Pen tablet

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 ___ grass-user mailing list grass-user@lists.osgeo.org http

[GRASS-user] Techniques using v.digit.

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 ___ grass-user mailing list grass-user@lists.osgeo.org http

[GRASS-user] Extracting from 2D to 3D

dvance, charles ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user

Re: [GRASS-user] Extracting from 2D to 3D

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

RE: [GRASS-user] extract by attribute from a dem

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

RE: [GRASS-user] "Classic" morphometric feature analysis

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

RE: [GRASS-user] Use of r.watershed

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

RE: [GRASS-user] Water boundaries to stream network...

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

RE: [GRASS-user] r.watershed speed-up

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

[GRASS-user] r.los behavior and computation

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

[GRASS-user] Coordinate systems?

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 ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user