On Wednesday 05 March 2008, G. Allegri wrote:
What's wrong with v.out.ascii? Couldn't you export and then remove
duplicate points by checking the coordinates? To avoid checking both X and
Y, these could be summed, so a single check would be enough.
giovanni
I guess v.out.ascii | v.in.ascii isn't so bad afterall. I was hoping for a
more general approach that didn't involve the loss of the associated
attribute table. In this case, I only need a simple ID, so the final
incantation looked something like:
v.to.points -v -i in=blocks_1 out=b1p dmax=75 --o
v.to.points -v -i in=blocks_2 out=b2p dmax=75 --o
# patch them together:
v.patch in=b1p,b2p out=vp --o
v.build vp
# remove duplicate points
# new file does not have an attribute table
v.out.ascii vp | sort -g | uniq | v.in.ascii -t out=veg_points
# add attribute table:
v.db.addtable veg_points
# cleanup
g.remove vect=b1p,b2p,vp
# export to shapefile:
v.out.ogr -e in=veg_points type=point dsn=veg_points.shp
And this got the job done. I wonder how hard it would be to add a similar
functionality to v.edit-- which would preserve the attribute table.
Cheers,
Dylan
2008/3/5, Dylan Beaudette <dylan.beaudette@gmail.com>:
> Hi,
>
> I have some "squares" which are stored as polygons. When converting these
> to
> points (v.to.points) I am left with the 5 points (first and last point
> are duplicated) that define the corners of the "square".
>
> Is there a vector module (v.edit / v.clean) that could remove duplicate
> points? I would like to replace the manual operation with v.digit with
> something that can be scripted. Note that there are multiple "squares",
> so a
> simple v.out.ascii | head -4 | v.in.ascii would be a little awkward.
>
> Ideas?
>
> --
> Dylan Beaudette
> Soil Resource Laboratory
> http://casoilresource.lawr.ucdavis.edu/
> University of California at Davis
> 530.754.7341
> _______________________________________________
> grass-user mailing list
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--
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341
