[postgis-users] Problem using ST_MapAlgebraExpr

[DavidRA]

Hi, it's very simple, like any other normalization: we have some values (in
this case, the values of each cell of the input raster) and want to tranform
them into others between 0 and 1. The minimum value of the raster will be
transformed as 0, and the maximum as 1. And the formula used is (cellValue -
minValue)/(maxValue - minValue).

An example for a 2x2 raster:

-Input raster:

2 3
6 4

-Output raster:

0 0'25
1 0'5

I hope this is clear enough, else let me know and I'll try to be more
especific. Thanks.

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