| MNDWI Algorithm Specification | |
The Modified Normalized Difference Water Index
algorithm was developed by Xu, 2006 and can enhance open water features while efficiently suppressing and even removing built-up land noise as well as vegetation and soil noise.
The greater enhancement of water in the MNDWI-image will result in more accurate extraction of open water features
as the built-up land, soil and vegetation all negative values and thus are notably suppressed and even removed.
The MNDWI results from the following equation:
MNDWI = (green_factor * green - mir_factor * middle_IR) / (green_factor * green + mir_factor * middle_IR)
Also the processor computes an additional flags band called 'mndwi_flags' with the following bit coding:
| Bit Position | Description |
|---|---|
| Bit 0 | The computed value for MNDWI is NAN or is Infinite |
| Bit 1 | The computed value for MNDWI is less than -1 (minus one) |
| Bit 2 | The computed value for MNDWI is greater than 1 (one) |