From: dblasby at openplans.org <dblasby@openplans.org>
Subject: [postgis-users] (no subject)
Date: Mon, 18 Jul 2005 13:35:51 -0400
Message-ID: <1121708151.42dbe877e36eb@webmail.limegroup.com> (raw)
>This sounds like floating point comparisons failing because
>> of numerical
>> rounding issues.
>
>Highly unlikely - JTS/GEOS is very robust wrt predicates.
I think he means the 2 geometries arent actually identical - the points
maybe "10-7 off". These differences would be hidden by converting to
WKT (since it doesnt show all 64bits of precision).
Try something like this:
SELECT encode( asBinary( geometry1 ) , 'hex'),
encode( asBinary( geometry2 ) , 'hex')
FROM ... ;
And see if the two are actually equal.
dave
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Subject: Re: [postgis-users] (no subject)
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