Index
Spectral indices from surface reflectance: vegetation, water, built-up, and burn severity, each with the paper it comes from.
Spectral index tools compute NDVI, EVI, SAVI, the two NDWIs and MNDWI, NDBI, and the burn ratios from band reflectances, each with the paper that defines it, plus band math for an index of your own. Remote sensing analysts, agronomists, and fire and water mappers use them to check a pixel or a formula before running it over a whole scene. Start with NDVI. One pitfall: the formulas expect surface reflectance, roughly 0 to 1, not the digital numbers stored in the file, so scale each band first; the tools flag values that look unscaled.
No tools here match . or .
I want to measure vegetation in a pixel
- NDVI
The normalized difference vegetation index from near-infrared and red surface reflectance, the standard measure of how much green vegetation a pixel holds.
- EVI
The enhanced vegetation index from blue, red, and near-infrared reflectance, which stays responsive over dense canopy where NDVI saturates.
- EVI2
The two-band enhanced vegetation index from red and near-infrared reflectance, which tracks EVI without needing a blue band.
- SAVI
The soil-adjusted vegetation index from red and near-infrared reflectance, with the soil adjustment factor L, for scenes where bare ground shows through.
I want to find water, or measure water in vegetation
- NDWI (McFeeters, open water)
The normalized difference water index of McFeeters 1996, from green and near-infrared reflectance: the one that maps open water.
- MNDWI
The modified normalized difference water index from green and shortwave-infrared reflectance, which separates water from built-up surfaces better than NDWI.
- NDWI (Gao, vegetation water)
The normalized difference water index of Gao 1996, from near-infrared and shortwave-infrared reflectance: the one that measures liquid water in vegetation.
I want to map built-up ground or burn severity
- NDBI
The normalized difference built-up index from shortwave-infrared and near-infrared reflectance, which highlights roofs, roads, and other built surfaces.
- NBR
The normalized burn ratio from near-infrared and the longer shortwave-infrared band, the index burn severity is measured with.
- dNBR (burn severity)
The difference between a pre-fire and a post-fire normalized burn ratio, with the published severity ranges it is usually read against.
I want to write an index of my own over named bands
- Band math
Evaluates your own expression over named bands: arithmetic, comparisons, a conditional, and a short list of functions, parsed and evaluated in the core rather than by a JavaScript evaluator.