[Gdal-dev] share the common edge of nearby polygon?

[Christoph Spoerri]

What you are looking for is a vector format with topology. The one format I 
know of is the ArcINFO/coverage format. Yet, when using the OGR the topology 
information is lost, since it does not expose the topology of the underlaying 
data. But, Frank W. may have more info on this.

You may want to look at the GEOS library, which has some support for topology 
(http://geos.refractions.net/).

Christoph

On Sunday 25 January 2004 04:29 am, Fu Chen wrote:
> Hi!
>
> I try to use Douglas-Peucker approximation algorithm to simplify the
> polygon in the GIS datasets. But it won't be useful on the common shp
> file for by ogr it get the points of the whole polygon. I can't know
> where is the common edge of nearby polygon. If use DP algorithm on every
> polygon itself, the common edge will not fit together.I need to put DP
> algorithm on the common edge seperately.
>
> So I hope the dataset of GIS should have the information of the common
> edge, and the polygon built by refering to common edges. This will save
> the store space (will not store the same point twice) and be easy to
> simply the line.
>
> any GIS format take this design? Any software to translate shp file to
> that format?
>
> Thank you!
>
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