Are scratch that thought. That's not right either. -----Original Message----- From: [EMAIL PROTECTED] on behalf of Obe, Regina Sent: Mon 11/24/2008 2:16 PM To: PostGIS Users Discussion Subject: RE: [postgis-users] Get concave hull from an array of longitudeinlatitude points Evidentally its this thing http://ubicomp.algoritmi.uminho.pt/local/concavehull.html
So I guess basically you take the boundary and you get rid of points that have points sitting to the right/left/top/or bottom of it and then you form a polygon from the remaining points. Well at least that is what it seems like to me visually. Just not quite sure how to program such a thing without writing yuck procedural code. Hope that helps, Regina -----Original Message----- From: [EMAIL PROTECTED] on behalf of Martin Davis Sent: Mon 11/24/2008 1:58 PM To: PostGIS Users Discussion Subject: Re: [postgis-users] Get concave hull from an array of longitude inlatitude points What's a concave hull? Ales Kecman wrote: > Hi! > > > I'm new to Postgis and would really like to get some help on getting a > concave hull from an array of points. > > For example: > > I have an array of points - longitude and latitude of buildings in > particular area in the city. I already managed to get a convex hull > polygon from this array of points, but this is not really helpful. > What I'm trying to get is some kind of concave hull polygon from an > array of points, which I would further like to use in Google Earth kml > file. > > Thanks. > ------------------------------------------------------------------------ > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > -- Martin Davis Senior Technical Architect Refractions Research, Inc. (250) 383-3022 _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users ----------------------------------------- The substance of this message, including any attachments, may be confidential, legally privileged and/or exempt from disclosure pursuant to Massachusetts law. It is intended solely for the addressee. If you received this in error, please contact the sender and delete the material from any computer.
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