[GRASS-user] Import, project

[Micha Silver]

On 06/17/2010 08:59 PM, stn wrote:
> Hi,
>
> I am new to grass and don't really know where to start.
With the man pages ;-)
>
> Please give me some hints on
>
> 1) how to import+project a vector-shapefile  (containing one layer of 
> non-overlapping administrative regions) with unknown 
> projection+coordinate-system into a database with latitude/longitude
If you don't know the projection of the source layer, you're pretty much 
out of luck. There's no way GRASS (or any GIS for that matter) can use 
geographic data without knowing its CRS.
No *.prj attached to the shapefile?? Does it overlap correctly with 
other layers of known CRS??
>
> 2) how to import+project a e00-rasterfile into the same database 
> (containing rasterpoints 1kmx1km, each with one scalar property)
I'm not sure about e00 raster. I think you have to import as a vector 
then convert to raster, so:
v.in.e00
then use one of the interpolation modules (i.e. v.surf.rst)
Another way might be to use ogr2ogr to convert the e00 file to an ascii 
grid, then import that as a raster.
>
> 3) how to export an ascii/excel/csv-list of every raster-point with a) 
> the corresponding scalar and b) the administrative region and c) the 
> coordinates lat/long of the raster-point
>
r.out.xyz does that

> I could not import because the files be imported have a different 
> coordinate system and import was refused because of that.
>
> I tried to google for a commandline/gui-program that reprojects, found 
> a few like shpproj, g.proj, m.proj, none of which seem to have 
> anything to do with reprojecting a shape-file.
>
If you do find the correct projection of the original shapefile, then 
you'll need to create two GRASS locations: one defined by the projection 
of the shapefile, and the second defined by Lon/Lat WGS84 . Then you
* import the shapefile into the Location that matches its projection
* switch to the target (WGS84) Location
* and from there, you run v.proj to reproject into the target projection.
> I use grass 6.4 on windows (linux is fine too) and have already 
> created a workspace fitted for germany with lat/long-coordinates in an 
> appropriate resolution.
>
Keep us posted on your progress.
> Thanks
> stn
>
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-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://surfaces.co.il


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