From: Sandro Santilli <strk@keybit.net>
Date: Fri, 10 Dec 2004 22:16:16 +0000 (+0000)
Subject: Added estimated_extent() doc.
X-Git-Tag: pgis_1_0_0RC1~167
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a37a8d910f4410fed7f930ac6210573f0f5a3460;p=postgis

Added estimated_extent() doc.


git-svn-id: http://svn.osgeo.org/postgis/trunk@1130 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/doc/postgis.xml b/doc/postgis.xml
index 625175e4f..8153822d7 100644
--- a/doc/postgis.xml
+++ b/doc/postgis.xml
@@ -3849,6 +3849,20 @@ FROM geometry_table;</literallayout>
           </listitem>
         </varlistentry>
 
+        <varlistentry>
+          <term>estimated_extent(schema, table, geocolumn)</term>
+
+          <listitem>
+            <para>
+	    Return the 'estimated' extent of the given spatial table.
+	    The estimated is taken from the geometry column's statistics
+	    gathered by running VACUUM ANALYZE, and is statistically 
+	    about 95% of 'real' extent.
+            </para>
+            <para>NOTE: This is only available with PostgreSQL >= 8.0.0</para>
+          </listitem>
+        </varlistentry>
+
         <varlistentry>
           <term>find_srid(varchar,varchar,varchar)</term>