[GRASS-user] min_area of v.in.ogr for geographic degrees

# v.in.ogr help v.in.ogr [...] min_area Minimum size of area to be imported (square units) Smaller areas and islands are ignored. Should be greater than snap^2 default: 0.0001 [...] Question: is the default min_area parameter (=0.0001) safe when importing data that

[GRASS-user] Converting polygons to lines

I need to convert a road network in polygons to lines to do a network analysis. I converted polygons to line by using v.type.bl- converting boundaries to lines. Then instead of getting single lines, i'm getting border lines over the polygon that was there earlier (No polygon its now line data).

[GRASS-user] Grass and Postgre limitation (if any)

Hi I have short question. I'm prepraring to create huge dataset, where data for different regions will be stored in different mapset but with the same structure of data (names of files and so on). The number of planned mapset is about 200-230, with about 10 postgreeSQL tables in every

Re: [GRASS-user] Converting polygons to lines

Well, if roads are polygons it colud be a problem. if you don't need atributes of roads I sugest to convert polygons to raster, run r.thin, and convert raster to lines. But in that way you will lost road attributes. supunmali pisze: I need to convert a road network in polygons to lines to

Re: [GRASS-user] Converting polygons to lines

Is that mean it is not possible?? I need the attribute data to do network analysis (e.g. optimal path). Pls suggest a method. Well, if roads are polygons it colud be a problem. if you don't need atributes of roads I sugest to convert polygons to raster, run r.thin, and convert raster to

Re: [GRASS-user] agricultural land

2009/3/30 Martin Schweizer schweizermar...@students.unibe.ch: Hi I have a little question: I have a point-vector layer where the points represents cities. For each city I know the population and I have calculated the dimension of the agricultural land that has to be around these cities to

Re: [GRASS-user] azimuth of lines with v.to.db?

Maris, I have merged it into GRASS 7. Markus On Mon, Mar 30, 2009 at 3:30 PM, Maris Nartiss maris@gmail.com wrote: Yes. I have no space to checkout GRASS 7 and thus can't test those changes under GRASS 7. Still I hope to get my new Dell up and running after four months of trying to get

[GRASS-user] minor annoyance with sqlite db driver

I recently converted several of my mapsets over to the sqlite datebase driver. I noticed that when a long-running process (such as v.surf.rst) happens to write to a vector attribute table at the same time some other process tries to access and attribute table (d.vect ... where=...) the first

Re: [GRASS-user] patching images from different UTM zones (without shell script?)

Thanks- I had originally been having trouble trying to extend the regions beyond the end of the zone because when I used g.region with -p flag, the nesw borders were given for each zone specifically, and I understood it that there were overlapping borders between zones 16,17, and 18. When I