ST_SetBandNoDataValue
Name
ST_SetBandNoDataValue — Sets the value for the given band that represents no data. Band 1 is assumed if no band is specified. To mark a band as having no nodata value, set the nodata value = NULL.
Synopsis
raster
ST_SetBandNoDataValue
(
raster
rast
, double precision
nodatavalue
)
;
raster
ST_SetBandNoDataValue
(
raster
rast
, integer
band
, double precision
nodatavalue
, boolean
forcechecking=false
)
;
Description
Sets the value that represents no data for the band. Band 1 is assumed if not specified. This will affect results from ST_Polygon , ST_DumpAsPolygons , and the ST_PixelAs...() functions.
Examples
-- change just first band no data value
UPDATE dummy_rast
SET rast = ST_SetBandNoDataValue(rast,1, 254)
WHERE rid = 2;
-- change no data band value of bands 1,2,3
UPDATE dummy_rast
SET rast =
ST_SetBandNoDataValue(
ST_SetBandNoDataValue(
ST_SetBandNoDataValue(
rast,1, 254)
,2,99),
3,108)
WHERE rid = 2;
-- wipe out the nodata value this will ensure all pixels are considered for all processing functions
UPDATE dummy_rast
SET rast = ST_SetBandNoDataValue(rast,1, NULL)
WHERE rid = 2;