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.
raster ST_SetBandNoDataValue(
raster rast, double precision nodatavalue)
;
raster ST_SetBandNoDataValue(
raster rast, integer band, double precision nodatavalue, boolean forcechecking=false)
;
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.
-- 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;