I have performed radiometric calibration and lee speckle filtering on a Sentinel-1 SAR data. Now i want to use Band Math with a threshold value of 2.18 Γ 10β2 ππ΅ mask the water surface in order to distinguish from the non-water surface. How should i solve the problem?
@marpet @ABraun @Ciaran_Evans @kedziorm
first you right-click on the Sigma0 product and select βlinear to/from dBβ
the output product is the log-scaled raster.
You can then apply the threshold in the band maths by simply using a condition
Sigma0db > x
where x is your value. But according to your example, 2.18 Γ 10β2 is 0.0218. Are you sure this does not refer to the linear-scaled data?