[postgis-users] How to generalize or simplify a Polygon

[Chris Faulkner]

Good luck with your search for an implementation of a line generalization. I
am using Java Topology Suite (http://www.vividsolutions.com/jts/jtshome.htm)
with postgis and was hoping that they would offer something similar.
Unfortunately, it doesn't.

I would have thought that your expectation that the resulting polygon should
cover at least as much area as the original is unrealistic. It you
generalise a line around a polygon, you change it's shape and if you change
shape, you change area. Full stop.

Chris



-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net]On Behalf Of Matt
Lynch
Sent: 28 August 2003 16:45
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] How to generalize or simplify a Polygon


Hi,

I have an application where I will be accepting a shape file (polygon)
to define a region of permitted access for a user which will be imported
to postgis.  That shape file has the potential to have many points if
the region defined has a border like a river or lake.  Are there any
functions or tools available that would take a polygon shape and reduce
or generalize the number of points in the polygon?  The resulting
polygon must cover at least as much area as the original.

Thanks,

Matt

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