[GRASS-dev] Re: [GRASS-user] Intersections on World Map

[Maciej Sieczka]

Martin Bley wrote:

> I still get stucked on an issue using v.overlay. I 
> imported a shapefile with the world continents (the one 
> from ESRI). Projection is Lat-Long.
>
> VERTI L 2 1 -180 -80 180 -80 1 1
> 
> Now I use the following command to merge the intersection
> between the latitude (80 South) and the areas in the
> world continents vector.
> 
> v.overlay ainput=$vector atype=line alayer=1 binput=World
>  btype=area \ blayer=1 output=$out operator=and
> 
> Works pretty well so far, until I reach latitude South
> 75+. Intersections doesn't match continents anymore
> (please see attached PNG file).
> 
> I would appreciate any hint.

Hi

There is a known bug/feature in v.overlay in lat/long
locations [1]. I can't say if it has the same background as
your issue. It might. Letting you know just in case.

http://wald.intevation.org/tracker/?func=detail&atid=204&aid=452&group_id=21

Maciek