Put a note that ST_LineMerge strips M dimension. Provide an example of Z-dimension...

Closes #3317

git-svn-id: http://svn.osgeo.org/postgis/trunk@16686 b70326c6-7e19-0410-871a-916f4a2858ee

diff --git a/doc/reference_editor.xml b/doc/reference_editor.xml
index 30da2972fc1893952b731bc02a2828c4e4e2a53a..6a6d0f749e3599d58ecff215470cef3a12a83162 100644 (file)
--- a/doc/reference_editor.xml
+++ b/doc/reference_editor.xml
@@ -805,6 +805,7 @@ GEOMETRYCOLLECTION(
 
                        <para>Availability: 1.1.0</para>
                        <note><para>requires GEOS &gt;= 2.1.0</para></note>
+                       <warning><para>Will strip the M dimension.</para></note>
                </refsection>
 
                <refsection>
@@ -827,6 +828,16 @@ ST_GeomFromText('MULTILINESTRING((-29 -27,-30 -29.7,-36 -31,-45 -33),(-45.2 -33.
 st_astext
 ----------------
 MULTILINESTRING((-45.2 -33.2,-46 -32),(-29 -27,-30 -29.7,-36 -31,-45 -33))
+
+-- example with Z dimension
+SELECT ST_AsText(ST_LineMerge(
+ST_GeomFromText('MULTILINESTRING((-29 -27 11,-30 -29.7 10,-36 -31 5,-45 -33 6), (-29 -27 12,-30 -29.7 5), (-45 -33 1,-46 -32 11))')
+               )
+);
+st_astext
+--------------------------------------------------------------------------------------------------
+LINESTRING Z (-30 -29.7 5,-29 -27 11,-30 -29.7 10,-36 -31 5,-45 -33 1,-46 -32 11)
+(1 row)
                        </programlisting>
                </refsection>
                <refsection>