# Generated by scripts/sync_indices.py from Awesome Spectral Indices (MIT).
# DO NOT EDIT BY HAND. Edit overlays (_asi_*.yaml, _folia_*.yaml) and re-run.
# Spec: docs/spec/SPECTRAL_INDICES.md
slug: bais2
name: Burned Area Index for Sentinel 2
short_name: BAIS2
formula: (1.0 - ((RE2 * RE3 * N2) / R) ** 0.5) * (((S2 - N2)/(S2 + N2) ** 0.5) + 1.0)
bands:
- RE2
- RE3
- N2
- R
- S2
domain: burn
theme: hazards
concepts:
- fire
rank: 14
display:
  colormap: hot
  range:
  - -1.0
  - 5.0
  reverse: true
pedagogy:
  description: 'Burned Area Index for Sentinel-2 (Filipponi 2018). A Sentinel-2-native

    reformulation of BAI that exploits the red-edge bands (RE2, RE3) and

    a SWIR2 normalization to discriminate burn scars on S2 specifically.

    Default operational S2 burn index in many EU pipelines.

    '
  use_cases:
  - Sentinel-2 burn-scar mapping post-event over Mediterranean and boreal landscapes
  - Forest-fire emergency response when only S2 is available
  - Multi-temporal burn-severity tracking on the 5-day S2 revisit cadence
  limitations:
  - Sentinel-2 only — requires red-edge bands not available on Landsat or MODIS
  - Sensitive to smoke and aerosol haze in early post-fire scenes
  - Empirical formulation; values are not directly comparable to NBR or BAI
  interpretation:
    high: Recent severe burn scar
    mid: Lower severity or partial burn
    low: Unburned vegetation or other cover
  authoritative_sources:
  - label: Filipponi 2018
    url: https://doi.org/10.3390/ecrs-2-05177
  - label: NV5 ENVI — Burn Indices
    url: https://www.nv5geospatialsoftware.com/docs/BurnIndices.html
  - label: Index Database · BAIS2
    url: https://www.indexdatabase.de/db/i-single.php?id=596
references:
- url: https://doi.org/10.3390/ecrs-2-05177
date_of_addition: '2021-04-07'
contributor: https://github.com/davemlz
platforms:
- Sentinel-2
source:
  authority: awesome-spectral-indices
  commit_sha: 7f28d3fe68af1287f7449faf0685659e73197212
  upstream_id: BAIS2
match_tags:
- area
- burn
- burned
- for
- index
- n2
- r
- re2
- re3
- s2
- sentinel
status: stable