<refsection>
<title>Description</title>
<para>Returns the centroid (point geometry) of the area represented by a pixel.</para>
+ <para>Availability: 2.1.0</para>
</refsection>
<refsection>
The 2-D array output can be passed along to any of the raster processing builtin functions, e.g. ST_Min4ma, ST_Sum4ma, ST_Mean4ma.
</para>
</note>
+ <para>Availability: 2.1.0</para>
</refsection>
<refsection>
<para>
Variant 4 is the same as Variant 3 with the exception that it assumes that the first band's pixels of <varname>rast</varname> will be set.
</para>
+ <para>Availability: 2.1.0</para>
</refsection>