Re: [GRASS-user] Re: r.watershed: pretty flat areas

Markus Metz pisze: On Wed, May 12, 2010 at 9:00 PM, Hamish hamis...@yahoo.com wrote: before after screenshots welcome :) before: http://sites.google.com/site/markusmetzgiswork/accumulation_regular.png after: http://sites.google.com/site/markusmetzgiswork/accumulation_beautified.png

Re: [GRASS-user] Re: r.watershed: pretty flat areas

Nice! Many thanks Markus. Annalisa 2010/5/13 Jarosław Jasiewicz jar...@amu.edu.pl Markus Metz pisze: On Wed, May 12, 2010 at 9:00 PM, Hamish hamis...@yahoo.com wrote: before after screenshots welcome :) before: http://sites.google.com/site/markusmetzgiswork/accumulation_regular.png

[GRASS-user] dems from coordinate lists

Hi, I've obtained DEMs in text files with columns X, Y and Z at 25m spacing. The first three entries in the text file are: - X,Y,Z 99550,2.9883e+06,1473.47 99550,2.98828e+06,1473.57 99550,2.98825e+06,1473.63 - To me it seems the easiest way to import these is the following: 1.

Re: [GRASS-user] dems from coordinate lists

You want the points to represent cell centers so you need to expand your region 1/2 pixel in all four directions. Also look at using r.in.xyz, it works directly on this type of data. Jamie On Thu, May 13, 2010 at 7:26 AM, Hanlie Pretorius hanlie.pretor...@gmail.com wrote: Hi, I've obtained

[GRASS-user] Re: dems from coordinate lists

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[GRASS-user] Re: dems from coordinate lists

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Re: [GRASS-user] dems from coordinate lists

If I follow correctly, instead of v.to.rast, you need to interpolate a raster DEM from the points. v.surf.rst produces nice results, but there are other interpolation modules as well in the raster category. Best regards, Mark On May 13, 2010, at 10:26 AM, Hanlie Pretorius

Re: [GRASS-user] dems from coordinate lists

MS wrote: If I follow correctly, instead of v.to.rast, you need to interpolate a raster DEM from the points. v.surf.rst produces nice results, but there are other interpolation modules as well in the raster category. That's the method I use also. I start with: v.in.ascii -z in=ascii_file

[GRASS-user] help(r.walk and r.cost and ogr)

hello all, I'm developing a pywps geoprocess in calculating accessibility, I saw a command called r.walk and r.cost not how viable is to use my project as: composite, I would like to share their experiences with these commands, downside is that the input data are vector network ogr I recommend to

[GRASS-user] Copying from a mapset in another data directory

I have some rasters in a grass data directory on a different mounted drive in unix that i want to copy into a different data directory + mapset -- i can't seem to figure out how to do this with g.copy, which AFAIK only copies from mapsets within a given data directory. Thoughts? --j

[GRASS-user] Latitude/Longitude vs UTM

Hi Folks, I have been playing with the seamless maps from the USGS. Specifically, my question is on the effect of Latitude/Longitude vs UTM with respect to hydrology modules such as r.watershed and r.topidx. I was trying to generate watershed maps with r.watershed. I've done this before for