# 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: gndvi
name: Green Normalized Difference Vegetation Index
short_name: GNDVI
formula: (N - G)/(N + G)
bands:
- N
- G
domain: vegetation
theme: vegetation
concepts:
- leaf-area-index
- crop-phenology
rank: 10
display:
  colormap: rdylgn
  range:
  - -0.2
  - 1.0
pedagogy:
  description: 'Green Normalized Difference Vegetation Index (Gitelson 1996). Replaces

    NDVI''s red term with green, increasing sensitivity to leaf chlorophyll

    content across a wider range of canopy densities. Common in

    precision-agriculture nitrogen monitoring.

    '
  use_cases:
  - Crop nitrogen and chlorophyll status monitoring through the growing season
  - Mid-to-high LAI vegetation where NDVI begins to saturate
  - Within-field variability mapping for variable-rate fertilizer application
  limitations:
  - Less sensitive to bare soil contrasts than NDVI — pair with SAVI for sparse cover
  - Still saturates at the upper LAI end, just at a higher threshold than NDVI
  - Green-band atmospheric scattering is greater than red — atmospheric correction matters more
  interpretation:
    high: Chlorophyll-rich, well-nitrogen-supplied canopy
    mid: Typical green canopy
    low: Senescing or stressed vegetation, soil
    negative: Water
  authoritative_sources:
  - label: Gitelson, Kaufman & Merzlyak 1996
    url: https://doi.org/10.1016/S0034-4257(96)00072-7
  - label: NV5 ENVI — Broadband Greenness
    url: https://www.nv5geospatialsoftware.com/docs/BroadbandGreenness.html
  - label: Index Database · GNDVI
    url: https://www.indexdatabase.de/db/i-single.php?id=28
references:
- url: https://doi.org/10.1016/S0034-4257(96)00072-7
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: GNDVI
match_tags:
- difference
- g
- green
- index
- n
- normalized
- vegetation
status: stable