# 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: nddi
name: Normalized Difference Drought Index
short_name: NDDI
formula: (((N - R)/(N + R)) - ((G - N)/(G + N)))/(((N - R)/(N + R)) + ((G - N)/(G + N)))
bands:
- N
- R
- G
domain: vegetation
theme: vegetation
concepts: []
rank: null
display:
  colormap: rdylgn
  range:
  - -0.2
  - 0.9
references:
- url: https://doi.org/10.1029/2006GL029127
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: NDDI
match_tags:
- difference
- drought
- g
- index
- n
- normalized
- r
- vegetation
status: stable