[GRASS-user] Intersections on World Map

[Martin Bley]

Hi,

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. 
Then I draw a line using v.in.ascii representing a latitude
e.g.

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. 

Regards,
Martin 

-- 
Martin Bley 
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