From: Regina Obe <lr@pcorp.us>
Date: Fri, 11 Nov 2011 08:40:57 +0000 (+0000)
Subject: put comment about expression
X-Git-Tag: 2.0.0alpha1~724
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9a73c7265e25823b6a171c41eec024d5819d2a86;p=postgis

put comment about expression

git-svn-id: http://svn.osgeo.org/postgis/trunk@8136 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/doc/reference_raster.xml b/doc/reference_raster.xml
index f195bf8d8..d347467b4 100644
--- a/doc/reference_raster.xml
+++ b/doc/reference_raster.xml
@@ -5312,7 +5312,7 @@ WHERE rid=167;
 				<variablelist>
 					<varlistentry>
 						<term>expression</term>
-						<listitem><para>The algebraic expression involving the 2 rasters that will define the pixel value when pixels intersect</para></listitem>
+						<listitem><para>A PostgreSQL algebraic expression involving the 2 rasters and PostgreSQL defined functions/operators that will define the pixel value when pixels intersect. e.g. ((rast1 + rast2)/2.0)::integer</para></listitem>
 					</varlistentry>
 					<varlistentry>
 						<term>pixeltype</term>