| NBAI Algorithm Specification | |
The NBAI operator algorithm computes the
Normalized Built-up Area
Index from a given product.
The NBAI results from the following equation:
NBAI = ((S2 - S1) / G) / ((S2 + S1) / G)
, where:
The bands are:
- G is the Green band
- S1 is the SWIR 1 band
- S2 is the SWIR 2 band
Also the processor computes an additional flags band called 'nbai_flags' with the following bit coding:
| Bit Position | Description |
|---|---|
| Bit 0 | The computed value for NBAI is NAN or is Infinite |
| Bit 1 | The computed value for NBAI is less than -1 (minus one) |
| Bit 2 | The computed value for NBAI is greater than 1 (one) |