Hi, Doen't the st_hausdorffDistance function compare shapes of geometries ?
Nicolas On 9 May 2012 19:36, <nicklas.a...@jordogskog.no> wrote: > Another aproach could be to compare angles in each vertex "corner". If all > angles are the same in some sort of tolerance the shape should be the same. > > > Jusr a thought > > > /Nicklas > > -- > > Sendt fra min Nokia N9 > > > 09.05.12 18:41 skrev Bob Pawley: > > Hi Sandro > > Absolutely, if it's something people want. > > I developed the first part a few months ago, just as something to do . I > compare relative distance of points(intersections) of the object, overriding > the actual distances(size) and ignoring any spatial reference (placement). > > The result is an array set of numbers that should match if the two objects > are the same. > > This system can be easily scaled to improve resolution. At the moment I use > a resolution of 100 points. > > I still need to develop a method of analyzing the arrays ( and perhaps, > giving a percent evaluation of sameness) for which I have some ideas. > > I will probably need some help in making it an actual Postgis function if > that is what you have in mind. > > Bob > > > -----Original Message----- > From: Sandro Santilli > Sent: Wednesday, May 09, 2012 9:13 AM > To: PostGIS Users Discussion > Subject: Re: [postgis-users] Same, similar et al > > On Wed, May 09, 2012 at 09:06:15AM -0700, Bob Pawley wrote: >> Hi Steve >> >> FYI - I'm not involved in the geography side of Postgis, I'm >> developing an application to analyze engineering drawings. So, same >> in shape even if the shapes are spatially diverse is what I was >> looking for. >> >> However, since this function doesn't exist I will need to develop >> something. > > Will you share it ? > > --strk; > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
