Hi all,
Thanks for your suggestions,
What I really need is a polygon that have exactly the same geometric center
(centroid) of the original polygon. I don´t know If generalization algorithms
(like st_simplify) have this property. Same for st_segmentize. I need to make
some tests first.
strk,
The use case is precisely calculating the polygon´s centroid by averaging the
coordinates of all the points of the polygon. In order to perform this I think
I need to have equally spaced points. Note that I´m working on the ellipsoid so
st_centroid no good to me...and I don´t want to project coordinates.
Thanks
Luis Tavares
________________________________
From: Sandro Santilli <s...@keybit.net>
To: Luis Tavares <lmike...@yahoo.com>; PostGIS Users Discussion
<postgis-users@lists.osgeo.org>
Sent: Tuesday, March 12, 2013 8:50 AM
Subject: Re: [postgis-users] polygon with equally spaced points from an
existing polygon
On Mon, Mar 11, 2013 at 09:22:09PM -0700, Luis Tavares wrote:
> How do I create a polygon with equally spaced points from an existing polygon?
Looks like a two steps process:
1) drop vertices that are too close (st_simplify may help)
2) add vertices where missing (st_simplify)
> I know that more the curvature or concavity changes sign more points are
> needed. So one solution would be to calculate the minimum of all distances
> between two consecutive points in the original polygon and use that distance
> to build my polygon with equally spaced points. Is this correct? If so, How
> do I proceed from here? Any ready made solution?
Calculating the minimum of all distances between two consecutive
points could be a useful standalone function. Don't you also need
minimum distance between any two points ? I'm curious about the
use case for the "consecutive only" approach.
--strk;
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