# 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: cig
name: Chlorophyll Index Green
short_name: CIG
formula: (N / G) - 1.0
bands:
- N
- G
domain: vegetation
theme: vegetation
concepts:
- leaf-area-index
rank: 22
display:
  colormap: rdylgn
  range:
  - 0.0
  - 10.0
pedagogy:
  description: 'Chlorophyll Index Green (Gitelson 2003). Uses the NIR-to-green

    reflectance ratio minus one to provide a near-linear estimator of

    leaf chlorophyll content. ESRI Living Atlas calls this "CI Green".

    '
  use_cases:
  - Leaf-chlorophyll content estimation in maize and other broadleaf crops
  - Nitrogen-status monitoring complementary to GNDVI in precision agriculture
  - Forest canopy chlorophyll mapping at moderate resolution
  limitations:
  - Less effective in low-LAI regimes where soil dominates green-band reflectance
  - Sensitive to angular effects between scenes — best used within a single date or BRDF-corrected
  - Often confused with the more familiar GCI (same index, name inverted)
  interpretation:
    high: High canopy chlorophyll content
    mid: Typical green canopy
    low: Low chlorophyll, stressed or sparse vegetation
  authoritative_sources:
  - label: Gitelson 2003
    url: https://doi.org/10.1078/0176-1617-00887
  - label: NV5 ENVI — Narrowband Greenness
    url: https://www.nv5geospatialsoftware.com/docs/NarrowbandGreenness.html
  - label: Index Database · CIG
    url: https://www.indexdatabase.de/db/i-single.php?id=128
references:
- url: https://doi.org/10.1078/0176-1617-00887
date_of_addition: '2021-04-07'
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: CIG
match_tags:
- chlorophyll
- g
- green
- index
- n
- vegetation
status: stable