more description on reclass expressions

git-svn-id: http://svn.osgeo.org/postgis/trunk@7356 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/reference_raster.xml b/doc/reference_raster.xml
index 85deefabc55e15f7868c0d4bb8bb9e3300b35285..022cae0bd70814de5f75d69f23a5fff554cdcbbe 100644 (file)
--- a/doc/reference_raster.xml
+++ b/doc/reference_raster.xml
@@ -378,7 +378,17 @@ VALUES (1,
                            </varlistentry>
                            <varlistentry>
                                <term><parameter>reclassexpr </parameter><type>text</type></term>
-                               <listitem><para>range expression consisting of comma delimited range:map_range mappings. : to define mapping that defines how to map old band values to new band values. ( means &gt;, ) means less than, ] &lt; or equal, [ means &gt; or equal</para></listitem>
+                               <listitem><para>range expression consisting of comma delimited range:map_range mappings. : to define mapping that defines how to map old band values to new band values. ( means &gt;, ) means less than, ] &lt; or equal, [ means &gt; or equal</para>
+                                   <para><programlisting>1. [a-b] = a &lt;= x &lt;= b
+
+2. (a-b] = a &lt; x &lt;= b
+
+3. [a-b) = a &lt;= x &lt; b
+
+4. (a-b) = a &lt; x &lt; b</programlisting></para>
+<para>( notation is optional so a-b means the same as (a-b)</para>
+                               </listitem>
+                               
                            </varlistentry>
                            <varlistentry>
                                <term><parameter>pixeltype </parameter><type>text</type></term>
@@ -4835,8 +4845,9 @@ POLYGON((3427928 5793243.85,3427928 5793243.8,3427928 5793243.75,3427927.85 5793
                        <refsection>
                                <title>Description</title>
                                
-                               <para>Creates a new raster formed by applying a valid PostgreSQL algebraic operation defined by the <varname>expression</varname> on the input raster (<varname>rast</varname>). If no <varname>band</varname> is specified
-        band 1 is assumed.  The new raster will have the same georeference, width, and height as the original raster.  Bands not designated will come back unchanged.</para>
+                               <para>Creates a new raster formed by applying a valid PostgreSQL algebraic operation defined by the <varname>reclassexpr</varname> on the input raster (<varname>rast</varname>). If no <varname>band</varname> is specified
+        band 1 is assumed.  The new raster will have the same georeference, width, and height as the original raster.  Bands not designated will come back unchanged.
+        Refer to <xref linkend="reclassarg" /> for description of valid reclassification expressions.</para>
         
                  <para>The bands of the new raster will have pixel type of <varname>pixeltype</varname>.  If <varname>reclassargset</varname> is passed in then each reclassarg defines behavior of each band generated.</para>