# 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: ndsiitm
name: Normalized Difference Snow/Ice Index for Landsat TM
short_name: NDSIITM
formula: (R - S1)/(R + S1)
bands:
- R
- S1
domain: snow
theme: cryosphere
concepts: []
rank: null
display:
  colormap: blues
  range:
  - -0.2
  - 1.0
references:
- url: https://doi.org/10.1080/01431160119766
date_of_addition: '2026-01-10'
contributor: https://github.com/davemlz
platforms:
- Sentinel-2
- Landsat-OLI
- Landsat-TM
- Landsat-ETM+
- MODIS
source:
  authority: awesome-spectral-indices
  commit_sha: 7f28d3fe68af1287f7449faf0685659e73197212
  upstream_id: NDSIITM
match_tags:
- difference
- for
- ice
- index
- landsat
- normalized
- r
- s1
- snow
status: stable