[GRASS-user] strange result of v.overlay in 6.4

[ivan marchesini]

Dear Grass users,
I have verified this strange behaviour:

I have two layers:

A has 50 areas "grouped" in a single isle
B has 30 small areas that in part overlap with the boundaries of the A
isle

I have created a new layer C from A and B:  A not B = C

Then C was edited by hands (by others using proprietary software)

I finally performed a new cut between C and B:   C not B = D

the layer D was correctly created where C was overlapping B (due to the
hands editing) but where the boundary of C was maintained (not edited,
hence perfectly corresponding to the B boundary) the layer D lost the
boundary.

anyone has got a similar problem?

many thanks 

Ivan






-- 
Ti prego di cercare di non inviarmi files .dwg, .doc, .xls, .ppt.
Preferisco formati liberi.
Please try to avoid to send me .dwg, .doc, .xls, .ppt files.
I prefer free formats.
http://it.wikipedia.org/wiki/Formato_aperto
http://en.wikipedia.org/wiki/Open_format

Ivan Marchesini
Perugia (Italy)
Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it
e-mail: ivan.marchesini at irpi.cnr.it
        ivan.marchesini at gmail.com
fax (mailfax): +39 1782092534
jabber: geoivan73 at jabber.org
skype: geoivan73
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: This is a digitally signed message part
Url : http://lists.osgeo.org/pipermail/grass-user/attachments/20110704/e99a0c69/attachment.bin