The Sentinel-3 OLCI Normalized Difference Bare ice Index (NDBI) was developed by Kokhanovsky et al. (2020) to differentiate snow-covered surfaces from bare ice. NDBI used two bands: one in the Blue (Band 2, 412.5 nm) and one in the NIR (Band 21, 1020 nm).
Formula: (Band 02 - Band 21) / (Band 02 + Band 21)
The surface types corresponding to NDBI values are shown in the table below. The thresholds may be modified depending on local conditions.
|0.5–0.8||Dark ice (melting)|