#3499, Clarify distance units in docs for ST_ClusterWithin

git-svn-id: http://svn.osgeo.org/postgis/trunk@15617 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/reference_measure.xml b/doc/reference_measure.xml
index 0a4cb0ebe5b0f27114b8f559564556c774034cc9..bf855a1588bfff0df307a176f6201edcabc91b06 100644 (file)
--- a/doc/reference_measure.xml
+++ b/doc/reference_measure.xml
@@ -1100,7 +1100,7 @@ SELECT ST_AsText(
                  <itemizedlist>
               <listitem>
                   <para>
-                      A "core" geometry, that is within <varname>eps</varname> distance of at least <varname>minpoints</varname> input geometries (including itself) or
+                      A "core" geometry, that is within <varname>eps</varname> distance (Cartesian) of at least <varname>minpoints</varname> input geometries (including itself) or
                   </para>
                          </listitem>
                          <listitem>
@@ -1392,7 +1392,7 @@ FROM parcels;
       <refsection>
         <title>Description</title>
 
-        <para>ST_ClusterWithin is an aggregate function that returns an array of GeometryCollections, where each GeometryCollection represents a set of geometries separated by no more than the specified distance.</para>
+        <para>ST_ClusterWithin is an aggregate function that returns an array of GeometryCollections, where each GeometryCollection represents a set of geometries separated by no more than the specified distance.  (Distances are Cartesian distances in the units of the SRID.)</para>
 
         <para>Availability: 2.2.0 - requires GEOS</para>
       </refsection>