# 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: ndci
name: Normalized Difference Chlorophyll Index
short_name: NDCI
formula: (RE1 - R)/(RE1 + R)
bands:
- RE1
- R
domain: water
theme: hydrology
concepts: []
rank: 17
display:
  colormap: viridis
  range:
  - -0.2
  - 0.5
pedagogy:
  description: 'Normalized Difference Chlorophyll Index (Mishra & Mishra 2012). Uses

    Sentinel-2/MERIS red-edge band 1 against red to retrieve chlorophyll-a

    concentration in turbid productive waters. The default inland-water

    Chl-a index on red-edge-equipped sensors.

    '
  use_cases:
  - Inland-water chlorophyll-a estimation in eutrophic lakes and reservoirs
  - Cyanobacterial bloom monitoring and early-warning systems
  - Coastal-zone productivity mapping during peak-bloom seasons
  limitations:
  - Calibrated for Case-2 (turbid) waters; less reliable in clear ocean waters where Case-1 ratios apply
  - Sensitive to bottom reflectance in shallow water — apply a depth or turbidity mask
  - Requires Sentinel-2 / MERIS / OLCI red-edge band; not available on Landsat
  interpretation:
    high: High chlorophyll concentration, dense bloom
    mid: Moderate chlorophyll, productive water
    low: Clear water, low productivity
  authoritative_sources:
  - label: Mishra & Mishra 2012
    url: https://doi.org/10.1016/j.rse.2011.10.016
  - label: NV5 ENVI — Alphabetical Indices
    url: https://www.nv5geospatialsoftware.com/docs/AlphabeticalListIndices.html
  - label: Index Database · NDCI
    url: https://www.indexdatabase.de/db/i-single.php?id=98
references:
- url: https://doi.org/10.1016/j.rse.2011.10.016
date_of_addition: '2022-10-10'
contributor: https://github.com/kalab-oto
platforms:
- Sentinel-2
source:
  authority: awesome-spectral-indices
  commit_sha: 7f28d3fe68af1287f7449faf0685659e73197212
  upstream_id: NDCI
match_tags:
- chlorophyll
- difference
- index
- normalized
- r
- re1
- water
status: stable