Re: [GRASS-user] libgrass_gis.6.3.0.dll

Chris Heys wrote: I recently downloaded the Windows version of 6.3.0, to run under XP, and it looks like it will be useful to me. But I keep seeing an error which says that file   libgrass_gis.6.3.0.dll   cannot be found. This happens if I navigate to   C:\GRASS\bin   and type, for

Re: [GRASS-user] grass topography and postgis

Topological datas are intrinsically topological: it's not about rules (that you can control with geometrical operators) but the geometrical structures. In topological geodatas, for example, two adjacent polygons share a common, single, boundary, while in Simple Feature model two polygons have

[GRASS-user] speeding up context evaluation...

Hi list, for a validation exercise I need to extract the class values around certain pixel location. I have a map with all the locations (numbered) and a map with the validation map. The code you find below is the one I came up with to get this information (only output to terminal for the

[GRASS-user] raster and vector shift

Hi, I'm working on some rasters derived from spot images. When I utilise the command r.to.vect it's work, but I've some trouble about the display of the rasters. Sometimes the raster and vector match correctly: http://i35.tinypic.com/2ed3vy8.png Sometimes there are some problems:

Re: [GRASS-user] grass topography and postgis

The simple answer is that Postgis and Shapefiles etc store data per record, all the information for a polygon is stored in a geometry which defines it's points and if several points then a line or a polygon. This system allows for overlap and duplication as each object is independent. GRASS, Arc

[GRASS-user] libgrass_gis.6.3.0.dll

Dear Grass Experts   I recently downloaded the Windows version of 6.3.0, to run under XP, and it looks like it will be useful to me. But I keep seeing an error which says that file   libgrass_gis.6.3.0.dll   cannot be found. This happens if I navigate to   C:\GRASS\bin   and type, for example,  

Re: [GRASS-user] grass topography and postgis

Hi Markus, I possibly don't have a full understanding of what topology is. I thought it was more or less the geometry, with a few rules relating different objects to each other. Attributes are things like place names or a value at a location, within a boundary etc. As postgis allows the storage of

Re: [GRASS-user] libgrass_gis.6.3.0.dll

Hi Christopher, I recently downloaded the Windows version of 6.3.0, to run under XP, and it looks like it will be useful to me. But I keep seeing an error which says that file libgrass_gis.6.3.0.dll cannot be found. This happens if I navigate to C:\GRASS\bin and type, for example, g.version

Re: [GRASS-user] grass topography and postgis

On Tue, Dec 2, 2008 at 11:12 AM, Matt B [EMAIL PROTECTED] wrote: Hi Markus, I possibly don't have a full understanding of what topology is. I thought it was more or less the geometry, with a few rules relating different objects to each other. Inofficial definition, without reflecting too much

Re: [GRASS-user] grass topography and postgis

Matt, On Tue, Dec 2, 2008 at 4:31 AM, Matt B [EMAIL PROTECTED] wrote: Hi Group, I'd like to set up grass to edit / work with data in a postgis database. So far I've figured out (and been informed, thanks Richard) that grass stores the topologoly data in it's own database and the external

Re: [GRASS-user] speeding up context evaluation...

Sorry, I was not reading carefully Your code snippet, but can't You just use mapcalc's ability to access neighborhood pixel values (see THE NEIGHBORHOOD MODIFIER in help page). Like output=if(location[-1,-1],validation,null()) || etc... It may eliminate need to create buffer, mask etc. still if it

Re: [GRASS-user] speeding up context evaluation...

Hufkens Koen wrote: for a validation exercise I need to extract the class values around certain pixel location. I have a map with all the locations (numbered) and a map with the validation map. The code you find below is the one I came up with to get this information (only output to

Re: [GRASS-user] grass topography and postgis

I think there is some confusion here: The main Postgis functionality is in line with the OGC SFS model, which is inherently NOT topological. This means that under Postgis as it currently stands, GRASS topological geometries cannot be stored. It does not mean that using Postgis, topological

Re: [GRASS-user] Elevation profi le from intersecting shapefiles‏

Micha, I followed your instructions with the following results: Import data from 2 shapefiles, Contour (layer 1)and Track (layer 2): (no problems reported) v.in.ogr dsn=/home/george/GRASSDATA/ output=testvectmap min_area=0.0001 snap=-1 Display vector map: (no problems, map displayes

Re: [GRASS-user] Elevation profi le from intersecting shapefiles‏

Dylan, using v.surf.rst gives me Segmentation fault, using: v.surf.rst [EMAIL PROTECTED] layer=1 zcolumn=ELEVATION elev=kahu-surf-rast tension=40. segmax=40 npmin=300 dmin=168.547850 dmax=842.739250 zmult=1.0 --overwrite I am on GRASS 6.3, Ubuntu 8.04, AMD64 Any suggestions please? Maris, I