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ST_SetValue

ST_SetValue
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Name

ST_SetValue — Returns modified raster resulting from setting the value of a given band in a given columnx, rowy pixel or the pixels that intersect a particular geometry. Band numbers start at 1 and assumed to be 1 if not specified.

Synopsis

raster ST_SetValue ( raster rast , integer bandnum , geometry geom , double precision newvalue ) ;

raster ST_SetValue ( raster rast , geometry geom , double precision newvalue ) ;

raster ST_SetValue ( raster rast , integer bandnum , integer columnx , integer rowy , double precision newvalue ) ;

raster ST_SetValue ( raster rast , integer columnx , integer rowy , double precision newvalue ) ;

Description

Returns modified raster resulting from setting the specified pixels' values to new value for the designed band given the raster's row and column or a geometry. If no band is specified, then band 1 is assumed.

Enhanced: 2.1.0 Geometry variant of ST_SetValue() now supports any geometry type, not just point. The geometry variant is a wrapper around the geomval[] variant of ST_SetValues()

Examples 

				-- 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 < 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 ...

				
-- Store the changed raster --
	UPDATE dummy_rast SET rast = ST_SetValue(rast,1, ST_Point(3427927.75, 5793243.95),100)
		WHERE rid = 2   ;

See Also

ST_Value , ST_DumpAsPolygons

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