# 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: arvi
name: Atmospherically Resistant Vegetation Index
short_name: ARVI
formula: (N - (R - gamma * (R - B))) / (N + (R - gamma * (R - B)))
bands:
- N
- R
- B
constants:
- gamma
domain: vegetation
theme: vegetation
concepts:
- fapar
- leaf-area-index
rank: 16
display:
  colormap: rdylgn
  range:
  - -0.2
  - 1.0
pedagogy:
  description: 'Atmospherically Resistant Vegetation Index (Kaufman & Tanre 1992).

    Uses the blue band to correct the red-band term for aerosol scattering,

    producing a vegetation signal that is more robust in hazy or

    aerosol-rich atmospheres than NDVI.

    '
  use_cases:
  - Vegetation monitoring under tropical biomass-burning smoke
  - Long-term phenology in regions where atmospheric correction is unreliable
  - Lighter-weight alternative to EVI when soil-adjustment is not needed
  limitations:
  - Requires a blue band — not computable on RGB-NIR drone sensors or Planet-Dove classic
  - Aerosol correction term gamma is empirical (commonly 1.0); sensor-specific re-tuning may help
  - Still saturates at high LAI like NDVI
  interpretation:
    high: Dense, atmospherically-resilient vegetation signal
    mid: Mixed cover
    low: Sparse vegetation
    negative: Water, cloud
  authoritative_sources:
  - label: Kaufman & Tanre 1992
    url: https://doi.org/10.1109/36.134076
  - label: NV5 ENVI — Broadband Greenness
    url: https://www.nv5geospatialsoftware.com/docs/BroadbandGreenness.html
  - label: Index Database · ARVI
    url: https://www.indexdatabase.de/db/i-single.php?id=2
references:
- url: https://doi.org/10.1109/36.134076
date_of_addition: '2021-05-11'
contributor: https://github.com/davemlz
platforms:
- Sentinel-2
- Landsat-OLI
- Landsat-TM
- Landsat-ETM+
- MODIS
- Planet-Fusion
source:
  authority: awesome-spectral-indices
  commit_sha: 7f28d3fe68af1287f7449faf0685659e73197212
  upstream_id: ARVI
match_tags:
- atmospherically
- b
- index
- n
- r
- resistant
- vegetation
status: stable