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2 => [ -- raster 2
[pixval, pixval, pixval],
-- row of raster 2
[pixval, pixval, pixval],
[pixval, pixval, pixval]
],
...
N => [ -- raster N
[pixval, pixval, pixval],
-- row of raster
[pixval, pixval, pixval],
[pixval, pixval, pixval]
]
];
pos := ARRAY[
0 => [x-coordinate,
y-coordinate], -- center pixel o
f output raster
1 => [x-coordinate,
y-coordinate], -- center pixel o
f raster 1
2 => [x-coordinate,
y-coordinate], -- center pixel o
f raster 2
...
N => [x-coordinate,
y-coordinate], -- center pixel o
f raster N
];
userargs := ARRAY[
'arg1',
'arg2',
...
'argN'
];
• All
ST_MapAlgebra()
callback functions must return a double-precision
value.
