| From: | Paul Matthews <plm(at)netspace(dot)net(dot)au> |
|---|---|
| To: | marcin mank <marcin(dot)mank(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Fixing geometic calculation |
| Date: | 2009-08-09 05:32:29 |
| Message-ID: | 4A7E5F6D.1090702@netspace.net.au |
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| Lists: | pgsql-hackers |
marcin mank wrote:
> You are correct, I think, though this does not solve the division problem:
>
As a first goal I'm just attempting to reduce the EPSILON from 1.0E-6
down to 1.0E-015 (give or take). The current regression test suite works
fine down to 1.0E-09. At 1.0E-10 errors appear, not in the geometry
sections, but in the select_view test of all things. This is most likely
due to postgresql now giving the more correct (hence different) answers.
A real test suite is needed for this. Setting up PostGIS + MySQL +
OtherCommerical for comparison purposes. The other problem is many of
the basic geometric operators in postgres, such a left of, above, etc,
are so incorrectly implemented, they are not even wrong.
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