Btw, on the cartoweb.org package, have you used this before?
On Dec 9, 10:56 pm, "Michael Geary" <[EMAIL PROTECTED]> wrote:
> Thanks for the tip, John - that sounds like a good one.
>
> Do you know if it takes care of the common border problem? That is, if you
> have a shapefile for, say, the 48 contiguous states, does it make sure that
> common borders follow the same path for each polygon? A while back I tried a
> standalone D-P algorithm written in Python, but it simplified each polygon
> independently from the rest, so common borders ended up with all sorts of
> gaps and overlaps. Not good at all.
>
> Here's a program that does claim to handle this correctly and also uses
> PostGIS. I haven't tried it out, though - no idea how it compares with the
> built-in D-P code that you mentioned:
>
> http://www.cartoweb.org/downloads/vertexsimplification/documentation....
>
> Also, for the OP,www.mapshaper.orgseems to be back up now. It's a nice way
> to do this interactively in just a few minutes, and it does handle common
> borders well.
>
> -Mike
>
> > From: maps.huge.info [Maps API Guru]
>
> > I would suggest loading Postgresql 8.3.5 and PostGIS 1.3.3 on
> > your system, load in the shapefile and use the built in D-P
> > functions to do the task. There's a new function just added
> > to 1.3.3 called "ST_SimplifyPreserveTopology" that prevents
> > splinters and invalid polygons being formed by the D-P
> > process. Very cool! It's free to use and runs under virtually
> > any OS. To import a shapefile, use the shp2pgsql function and
> > to create shapefile from the database use pgsql2shp.
>
> > -John Coryat
>
> >http://maps.huge.info
>
> >http://www.usnaviguide.com
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