[GRASSLIST:2353] Problems with projection conversion of vector files

[Rich Shepard]

On Fri, 17 Aug 2001, anne-claire serres wrote:

> the map is displayed in the monitor but the region's coordinates (and so
> the vector map) are totally wrong (see region.jpg attached file).

> So, I search why and I find that when it creates the dig file (see
> location.jpg attached file), it creates North = 5 (and I don't know the
> unit) instead of 60 grades and south = -64 instead of 44 grades.
>
> I think I miss something, perhaps when the "v.support" is automatically runned ?

Anne-Claire,

  I do not think that v.support should be necessary after reprojecting an
existing GRASS vector map. That module will build topology after importing
from a different format. If it is run automatically, theoretically it should
make no difference -- particularly with the region's boundary.

  What units and values should define the area of your map? I have had to
hand-edit the WIND and DEFAULT_WIND files to get the coverage necessary for
the maps to be properly displayed.

  IIRC, you converted from geographic coordinates (lon/lat) to a projection,
correct? I had problems with r.proj recently and I wonder if similar
problems exist with v.proj. Others with better ideas than I need to step in
here and offer some help. I, too, am interested in the solution.

Rich

Dr. Richard B. Shepard, President

                       Applied Ecosystem Services, Inc. (TM)
            2404 SW 22nd Street | Troutdale, OR 97060-1247 | U.S.A.
 + 1 503-667-4517 (voice) | + 1 503-667-8863 (fax) | rshepard at appl-ecosys.com
                 Making environmentally-responsible mining happen.