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. -- View this message in context: http://postgis.17.n6.nabble.com/Problem-using-ST-MapAlgebraExpr-tp4514561p4515113.html Sent from the PostGIS - User mailing list archive at Nabble.com. _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
