| SWM Algorithm Specification | |
The SWM operator algorithm computes the Sentinel
Water Mask from a given product.
The SWM results from the following equation:
SWM = (B + G) / (N + S1)
, where:
The bands are:
- B is the Blue band
- G is the Green band
- N is the NIR band
- S1 is the SWIR 1 band
Also the processor computes an additional flags band called 'swm_flags' with the following bit coding:
| Bit Position | Description |
|---|---|
| Bit 0 | The computed value for SWM is NAN or is Infinite |
| Bit 1 | The computed value for SWM is less than -1 (minus one) |
| Bit 2 | The computed value for SWM is greater than 1 (one) |