Hey DannyD, I'm afraid I don't understand. Are you talking about __oriented__ bbox? Cheers, Rémi-C
2014-10-23 18:28 GMT+02:00 DannyD <daniel.m.dev...@gmail.com>: > Perhaps already answered, but I start with an empty envelope and use > 'expandToInclude' successively on each vertex. > On Oct 23, 2014 7:57 AM, "Håvard Tveite" <havard.tve...@nmbu.no> wrote: > >> Search for "Rotating calipers" + width >> >> Håvard >> >> On 2014-10-23 15:33, Rémi Cura wrote: >> >>> Hey list, >>> somebody has a good idea about how efficiently computing an approximate >>> oriented bbox for a polygon ? >>> >>> The simplest approaches I can think of are >>> - iteratively rotate the geom by few degrees, take the envelop. Keep >>> ration where envelope is min >>> - using Principal Components Analysis : extract points regularly >>> spaced on border of object, compute PCA . >>> >>> Thanks, >>> Cheers, >>> Rémi-C >>> >>> >>> _______________________________________________ >>> postgis-users mailing list >>> postgis-users@lists.osgeo.org >>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >>> >>> >> -- >> Håvard Tveite >> Department of Mathematical Sciences and Technology, NMBU >> Drøbakveien 31, POBox 5003, N-1432 Ås, NORWAY >> Phone: +47 64965483 Fax: +47 64965401 http://www.nmbu.no/imt/ >> _______________________________________________ >> postgis-users mailing list >> postgis-users@lists.osgeo.org >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> > > _______________________________________________ > postgis-users mailing list > postgis-users@lists.osgeo.org > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >
_______________________________________________ postgis-users mailing list postgis-users@lists.osgeo.org http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users