I am attempting to complete a NDVI calculation using two bands (3 and 4) from
a Multiband Raster stored as a Table (nclraster1).
>From a previous question asked I am basing my calculation on:
SELECT
ST_MapAlgebra(ST_MapAlgebra(a.rast, 4, b.rast, 3, "rast - b.rast",
"8BUI"),
ST_MapAlgebra(a.rast, 4, b.rast, 3, "a.rast + b.rast2", "8BUI"), "a.rast /
b.rast", "8BUI")
FROM
nclraster1 a, nclraster1 b;
This does not work for me, returning the column a.rast does not exist.
Any pointers on where I'm going wrong much appreciated.
James
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