Database Reference
In-Depth Information
thesameorappropriateattributes.Thestandardconstraintscomprisethefollowing
rules:
•
Width and height
: This rule states that all the rasters must have the same
width and height
•
Scale X and Y
:Thisrulestatesthatalltherastersmusthavethesamescale
X and Y
•
SRID
: This rule states that all rasters must have the same SRID
•
Same alignment
:Thisrulestatesthatallrastersmustbealignedtoonean-
other
•
Maximum extent
:Thisrulestatesthatallrastersmustbewithinthetable's
maximum extent
•
Number of bands
:Thisrulestatesthatallrastersmusthavethesamenum-
ber of bands
•
NODATA values
: This rule states that all raster bands at a specific index
must have the same NODATA value
•
Out-db
:Thisrulestatesthatallrasterbandsataspecificindexmustbe
in-
db
or
out-db
, not both
•
Pixel type
:Thisrulestatesthatallrasterbandsataspecificindexmustbe
of the same pixel type
The error message indicates that we violated the
out-db
constraint. But we can't
accepttheerrormessageasisbecausewearenotdoinganythingrelatedto
out-
db
.Allwearedoingisaddingasecondbandtotheraster.Addingthesecondband
violatesthe
out-db
constraintbecausetheconstraintispreparedonlyforoneband
in the raster, not a raster with two bands.
Wewillhavetodroptheconstraints,makeourchanges,andreapplytheconstraints.
SELECT DropRasterConstraints('prism',
'rast'::name);
UPDATE prism SET
rast = ST_AddBand(
rast,
ST_MapAlgebra(rast, 1, '32BF',
'[rast] / 100.', -9
999),
1
