Hello,
I have Landsat 9 images processed with acolite, and I want to normalize the parameters turbidity, chla and temperature in the range of 0-1 to develop an index. How can I normalize the parameters using snap?
You can do it using the band math and the common normalisation equation.
n_i={x_i − min(x) \over max(x)−min(x)}
But it is difficult to get the min and max value. Maybe you know them. But you can also get the min and max from the actual value range from the band.
To do this you need to have the EOMasters Toolbox Basic (unfortunately the links on the overview page do not work at the moment. Will be fixed soon) installed. It provides several exntensions for the Band Maths. You find the toolbox via the plugin manager.
Assuming the band name is turbidity, the equation would be
(turbidity - stx(turbidity, "min")) / (stx(turbidity, "max") - stx(turbidity, "min"))
Preferred are absolute min/max values which do not depend on the value range of the actual scene. This makes the normalised values comparabale with other scenes.
Marco from EOMasters - Mastering Earth Observation