[GRASS-user] v.patch drops boundary vector regions

[Daniel Victoria]

I had some similar problems and they were related to topology. I found
this in the v.patch man page:

NOTES
Any vectors that are duplicated among the maps being patched together
(e.g., border lines) will have to be edited or removed after v.patch
is run. Such editing can be done automatically using v.clean
(tool=snap,break,rmdupl).

Could that be it? It worked for me...

Daniel

On Thu, Feb 28, 2008 at 6:10 PM, J. Brian Adams <brian.adams at fandm.edu> wrote:
> I am experiencing an interesting problem with v.patch  I am trying to
>  patch together parcel maps from many (60) different townships into one
>  large county-wide parcel map.  When done, the county-wide vector map
>  drops many regions. It appears that the dropped regions are all very
>  large compared to most of the parcels and they overlap the boundaries
>  between townships.
>
>  If it is important, the parcels maps were imported from shapefiles.
>
>
>
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