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#1160: documentation clarification of behavior

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git-svn-id: http://svn.osgeo.org/postgis/trunk@7755 b70326c6-7e19-0410-871a-916f4a2858ee
This commit is contained in:
Regina Obe 2011-08-16 12:51:30 +00:00
parent 21bfcbf735
commit 88b2edb9c5
1 changed files with 14 additions and 2 deletions
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16
doc/reference_operator.xml
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@ -534,7 +534,7 @@ FROM
<refnamediv>
<refname>&#61;</refname>
<refpurpose>Returns <varname>TRUE</varname> if A's bounding box is the same as B's.</refpurpose>
<refpurpose>Returns <varname>TRUE</varname> if A's bounding box is the same as B's. Uses double precision bounding box.</refpurpose>
</refnamediv>
<refsynopsisdiv>
@ -596,6 +596,10 @@ FROM
<para>&curve_support;</para>
<para>&P_support;</para>
<para>Changed: 2.0.0 , the bounding box of geometries was changed to use double precision instead of float4 precision of
prior. The side effect of this is that in particular points in prior versions that were a little different may have returned
true in prior versions and false in 2.0+ since their float4 boxes would be the same but there float8 (double precision), would be
different.</para>
</refsection>
@ -627,7 +631,15 @@ GROUP BY column1;
st_astext
---------------------
LINESTRING(0 0,1 1)
(1 row)</programlisting>
(1 row)
-- In versions prior to 2.0, this used to return true --
SELECT ST_GeomFromText('POINT(1707296.37 4820536.77)') =
ST_GeomFromText('POINT(1707296.27 4820536.87)') As pt_intersect;
--pt_intersect --
f
</programlisting>
</refsection>
<refsection>