Re: [GRASS-user] Questions about datum management

On Fri, 24 Oct 2008, Corrado wrote: Dear friends, a few questions on some things I do not understand well about datum: 1) what is a datum tranformation parameter? An extra calculation is needed when re-projecting maps and data between two different co-ordinate systems (in addition to the re

[GRASS-user] calculating surface

Hello Users group Have two vector-maps with areas map-A and map-B Is there a grass-module to calculate the total surface (m2 or ha by category) of the areas of the map-B witch are inside the area(s) of the map-A. Thanks Joop Goedbloed ___ grass-us

[GRASS-user] settings nulls with r.mapcalc

Hi, Are the following calls doing the same in terms of which cells get assigned the null value? $ r.mapcalc "new_raster = if(raster == 0 || raster == 253, null(), raster)" $ r.null map=raster setnull=0,253 Thanks, -- Seb ___ grass-user mailing list

[GRASS-user] Building digital terrain model from shapefile

Dear All, I imported a shapefile on GRASS, which have one collumn with the ELEVATION. How can I generate a Digital Terrain Model using this vector map, and using ELEVATION fields as attribute? Best wishes, miltinho astronauta brazil ___ grass-user maili

Re: [GRASS-user] Building digital terrain model from shapefile

On Monday 27 October 2008, Milton Cezar Ribeiro wrote: > Dear All, > I imported a shapefile on GRASS, which have one collumn with the ELEVATION. > How can I generate a Digital Terrain Model using this vector map, and using > ELEVATION fields as attribute? > > Best wishes, > > miltinho astronauta >

Re: [GRASS-user] calculating surface

On Mon, Oct 27, 2008 at 9:50 AM, Joop Goedbloed <[EMAIL PROTECTED]> wrote: > Hello Users group > > Have two vector-maps with areas map-A and map-B > > Is there a grass-module to calculate the total surface (m2 or ha by > category) > of the areas of the map-B witch are inside the area(s) of the map-

[GRASS-user] Re: grass-user Digest, Vol 30, Issue 61

> > Hello Users group > > Have two vector-maps with areas map-A and map-B > > Is there a grass-module to calculate the total surface (m2 or ha by > category) > of the areas of the map-B witch are inside the area(s) of the map-A. > > Thanks > > Joop Goedbloed > Joop, Combine the two maps using

Re: [GRASS-user] Wrong projection info after importing Geotif

Markus, I made the mapset using the QGIS plugin Grass /New mapset. I'm not sure if I made something wrong or it was a problem of the plugin(I'll clarify this), but the fact is that I ended up with this (wrong) region: ~$ g.region -p GRASS_INFO_ERROR(9537,1): region for current mapset is invalid

Re: [GRASS-user] Wrong projection info after importing Geotif

Agus, On Mon, Oct 27, 2008 at 10:17 PM, Agustin Lobo <[EMAIL PROTECTED]> wrote: > Markus, > > I made the mapset using the QGIS plugin Grass /New mapset. > I'm not sure if I made something wrong or it was a problem of > the plugin(I'll clarify this), but the fact is that I ended up with > this (wr

Re: [GRASS-user] i.pca vs. r.covar/m.eigensystem/r.mapcalc

My apologies for BUMPing :-) On Sun, 2008-10-12 at 00:20 +0200, Nikos Alexandris wrote: > I wanted to check/verify some i.pca results so I calculated 2 principal > components using r.covar, m.eigensystem and r.mapcalc. The results are > not the same with i.pca's output. > > (Maybe this post http:

[GRASS-user] Call for Papers - AAG 2009

--Please Pass On-- Call for Papers - "Free and Open Source Software for geographers" The deadline to submit papers for the Association of American Geographers(AAG) annual conference has been extended until Nov. 13, 2008. There will be organized sessions on "Free and Open Source Software", sponsor