[GRASS-user] Apply arbitrary edit to all coordinates in a vector

[Helmut Kudrnovsky]

Ken Mankoff wrote
> Dear GRASS list,
> 
> I'm working with data in a rotated pole projection. I'm able to convert
> any
> (lon,lat) pair from its "real" coordinates to its rotated pole coordinates
> by piping it through the following proj command:
> 
> invproj -f "%f" +proj=ob_tran +o_proj=latlon +o_lon_p=-200 +o_lat_p=18
> +lon_0=180 -m 57.295779506
> 
> In order to maintain the integrity of the data, I'd like to keep working
> in
> its native coordinates. Is there a way to take an arbitrary vector from
> GRASS and apply an arbitrary transformation to each element? v.edit has a
> move feature, but this is not what I want.
> 
> I think I can access all points and lines and boundaries with "v.out.ascii
> Z layer=-1 -c format=standard". But if I go this route I'll need to parse
> apart the output, pipe only the coordinates through the invproj command,
> and then re-assemble. I hope there is an easier way.
> 
> Thanks,


v.transform - Performs an affine transformation (shift, scale and rotate) on
vector map. 
https://grass.osgeo.org/grass74/manuals/v.transform.html

not sure it is what you're looking for.



-----
best regards
Helmut
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