[GRASS-user] Creating vector lines from vector or raster points

[Nikos Alexandris]

Lee Eddington wrote:
> I'd like to create vector lines from vector or raster point data.  I have
> rasters of x and y wind components and have used r.mapcalc to compute the x
> and y values of the original raster grid points and the x and y values for
> displacements points due to the wind speed and direction.  I'd like to take
> these x and y location values in these rasters and create vector lines that
> connect the original x,y grid points to the displacement points.  I can
> create vector points with these values at the gird points using r.to.vect,
> but not sure how to create new vector lines with the info.

Does the m.cogo module help? See:

http://grass.osgeo.org/grass64/manuals/m.cogo.html  OR  
http://grass.osgeo.org/grass70/manuals/m.cogo.html
 
Nikos