[GRASS-user] Trouble with reprojecting a vector file

[Markus Metz]

On Fri, Dec 27, 2013 at 6:27 PM, Thomas Adams <tea3rd at gmail.com> wrote:
> All,
>
> I'm using GRASS 7.0 svn from a few weeks ago on Ubuntu 13.10 (not that I
> think either is an issue). I have imported a fairly large shapefile from
> here: http://www.nohrsc.noaa.gov/data/vector/master/rfc_us.tar.gz -- 3084
> KB. It imports just fine into a lat/long Location and displays just fine,
> but when I try to reproject the map into a LCC projection Location, I lose
> feature data for most of the 12 (large) polygons. These polygons are
> displayed (unfilled with any color) in my map, and when I query them I get
> no attribute info; the other polygons (about 4 out of the 12) are fine. I
> have tried the reprojection several times with identical results. This same
> result occured with GRASS 6.4.x as well.

This is a known problem which can be avoided by adding new vertices
with v.split. See also
http://trac.osgeo.org/grass/attachment/ticket/1918/dense_points_effect.png
for an illustration.

Markus M

>
> I have successfully reprojected other vector maps from my lat/long Location
> into my LCC Location without issues. It seems I have hit a memory problem??
> My computer has 8GB RAM.
>
> One thought is to import the vector map directly into my LCC Location; if
> memory serves there is a way to do this from the command line, but I can not
> remember how...
>
> Regards,
> Tom
>
>
>
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