[postgis-users] NDVI Calculation from two bands within one Raster

JamesH james.holmes at newcastle.ac.uk
Mon Apr 2 06:03:54 PDT 2012

Have upgraded to Beta4,
new error message returning for 
'SELECT ST_MapAlgebraExpr(a.rast, 4, b.rast, 3, '(rast1 - rast2) /(rast1 +
rast2)::float') FROM nclraster1 a, nclraster1 b;'

As  column "rast1" does not exist. 
With the previous PostGIS raster version, this has not returned before.
Any advice?


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