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ST_SetValue

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git-svn-id: http://svn.osgeo.org/postgis/trunk@5754 b70326c6-7e19-0410-871a-916f4a2858ee
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Regina Obe 2010-07-27 18:22:42 +00:00
parent 88f836eed2
commit 3503b149fb
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77
doc/reference_wktraster.xml
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@ -1490,7 +1490,7 @@ WHERE rid = 2;
</sect1>
<sect1 id="Raster_Pixel_Accessors">
<title>Raster Pixel Accessors</title>
<title>Raster Pixel Accessors and Settors</title>
<refentry id="RT_ST_PixelAsPolygon">
<refnamediv>
@ -1748,6 +1748,81 @@ WHERE
<xref linkend="ST_Intersects" /></para>
</refsection>
</refentry>
<refentry id="RT_ST_SetValue">
<refnamediv>
<refname>ST_SetValue</refname>
<refpurpose>Sets the value of a given band in a given columnx, rowy pixel or at a pixel that intersects a particular geometric point. Band numbers start at 1 and assumed to be 1 if not specified.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis>
<funcprototype>
<funcdef>double precision <function>ST_SetValue</function></funcdef>
<paramdef><type>raster </type> <parameter>rast</parameter></paramdef>
<paramdef><type>geometry </type> <parameter>pt</parameter></paramdef>
<paramdef><type>double precision </type> <parameter>newvalue</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>double precision <function>ST_SEtValue</function></funcdef>
<paramdef><type>raster </type> <parameter>rast</parameter></paramdef>
<paramdef><type>integer </type> <parameter>bandnum</parameter></paramdef>
<paramdef><type>geometry </type> <parameter>pt</parameter></paramdef>
<paramdef><type>double precision </type> <parameter>newvalue</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>double precision <function>ST_SetValue</function></funcdef>
<paramdef><type>raster </type> <parameter>rast</parameter></paramdef>
<paramdef><type>integer </type> <parameter>columnx</parameter></paramdef>
<paramdef><type>integer </type> <parameter>rowy</parameter></paramdef>
<paramdef><type>double precision </type> <parameter>newvalue</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>double precision <function>ST_SetValue</function></funcdef>
<paramdef><type>raster </type> <parameter>rast</parameter></paramdef>
<paramdef><type>integer </type> <parameter>bandnum</parameter></paramdef>
<paramdef><type>integer </type> <parameter>columnx</parameter></paramdef>
<paramdef><type>integer </type> <parameter>rowy</parameter></paramdef>
<paramdef><type>double precision </type> <parameter>newvalue</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>Sets the specified pixel value to new value for the designed band given the row column location or a goemetric point location.
If no band is specified, then band 1 is assumed.
</para>
<note><para>Setting by geometry currently only works for points.</para></note>
</refsection>
<refsection>
<title>Examples</title>
<programlisting>
-- Geometry example
SELECT (foo.geomval).val, ST_AsText(ST_Union((foo.geomval).geom))
FROM (SELECT ST_DumpAsPolygons(
ST_SetValue(rast,1,
ST_Point(3427927.75, 5793243.95),
50)
) As geomval
FROM dummy_rast
where rid = 2) As foo
WHERE (foo.geomval).val &lt; 250
GROUP BY (foo.geomval).val;
val | st_astext
-----+-------------------------------------------------------------------
50 | POLYGON((3427927.75 5793244,3427927.75 5793243.95,3427927.8 579324 ...
249 | POLYGON((3427927.95 5793243.95,3427927.95 5793243.85,3427928 57932 ...
</programlisting>
</refsection>
<refsection>
<title>See Also</title>
<para><xref linkend="RT_ST_Value" />, <xref linkend="RT_ST_DumpAsPolygons" /></para>
</refsection>
</refentry>
</sect1>
<sect1 id="Raster_Editors">