JP de Miranda wrote:
Mark,
I do believe that box2d returns a polygon with 5 points.
Here is an example
My starting polygon
POLYGON((-81.507568359375 42.7631458668949,-81.4141845703125
43.6023850422415,-81.32080078125 44.441624217588,-79.6893310546875
44.6526402614971,-78.057861328125 44.8636563054061,-77.047119140625
44.3015041922804,-76.036376953125 43.7393520791547,-76.7889404296875
43.0448886007946,-77.54150390625 42.3504251224346,-78.310546875
42.3260577253395,-79.07958984375 42.3016903282445,-80.2935791015625
42.5324180975697,-81.507568359375 42.7631458668949))
Results of box2d
POLYGON((-81.507568359375 42.3016891479492,-81.507568359375
44.8636589050293,-76.036376953125 44.8636589050293,-76.036376953125
42.3016891479492,-81.507568359375 42.3016891479492))
I think you will need to give more information about your query. I get
this result:
postgis=# select 'POLYGON((-81.507568359375
42.7631458668949,-81.4141845703125 43.6023850422415,-81.32080078125
44.441624217588,-79.6893310546875 44.6526402614971,-78.057861328125
44.8636563054061,-77.047119140625 44.3015041922804,-76.036376953125
43.7393520791547,-76.7889404296875 43.0448886007946,-77.54150390625
42.3504251224346,-78.310546875 42.3260577253395,-79.07958984375
42.3016903282445,-80.2935791015625 42.5324180975697,-81.507568359375
42.7631458668949))'::geometry::box2d;
box2d
--------------------------------------------------------------------------
BOX(-81.507568359375 42.3016891479492,-76.036376953125 44.8636589050293)
(1 row)
ATB,
Mark.
--
Mark Cave-Ayland
Sirius Corporation - The Open Source Experts
http://www.siriusit.co.uk
T: +44 870 608 0063
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