It's on my todo. well first step of my todo anyway. http://trac.osgeo.org/postgis/ticket/1332
Brent -- thinking of your idea Have you tried using ST_LongestLine? http://www.postgis.org/documentation/manual-svn/ST_LongestLine.html I'm hoping to get back to this ticket soon but tied up with other things. Thanks, Regina http://www.postgis.us > -----Original Message----- > From: postgis-users-boun...@postgis.refractions.net > [mailto:postgis-users-boun...@postgis.refractions.net] On > Behalf Of Brent Fraser > Sent: Monday, June 18, 2012 12:37 PM > To: PostGIS Users Discussion > Subject: Re: [postgis-users] Minimum Bounding Rectangle > > Madison, > > I went looking a few months ago, but could find nothing. > I wrote some PHP to: > 1. Find the length of the polygon (vertices farthest apart) > 2. Find the width (based on vertices farthest from length line) > 3. Build bounding box using length (with angle of the the length > line) and the width > > I'm still pondering the result when the input polygon is a square... > > But there should really be something like a > "ST_ExtentRotated" or "ST_RotatedBBox" function in PostGIS. > > Best Regards, > Brent Fraser > > On 6/15/2012 2:03 PM, Madison Shaw wrote: > > Hi, > > > > I was wondering if any one could possibly offer some advice. > > > > I am wanting to calculate the area for a minimum bounding rectangle > > for individual polygon features. I know I can use st_envelope or > > st_extent along with st_area but this doesn't quite give me the > > results I am after. > > > > For example if the polygon was already a rectangle but was > orientated > > on an angle the bounding box area is much larger than the > area of the > > original rectangle, whereas I would like it to be the same > value. I > > suppose what I am after is a convex hull but as a > rectangle. Is this > > possible? > > > > Any help is greatly appreciated. > > > > Cheers > > > > Madison > > _______________________________________________ > > 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
