Landsat 8/9 ALT

Alteration Index for Landsat 8/9

Geology Satellite Provider: USGS/NASA

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Applications

Mineral Exploration

Hydrothermal Alteration Mapping

Geological Surveys

Iron Ore Detection

Quick Stats

Category: geology

Sensor: Landsat 8/9

Provider: USGS/NASA

Bands Used: 2

Description

Geological index used to identify areas of hydrothermal alteration and mineral deposits. The ratio highlights areas where clay minerals and hydroxyl-bearing minerals are present, indicating potential alteration zones.

Formulas

General Formula

Landsat 8/9 Specific Formula

B6 / B7

Spectral Band Visualization

Band Wavelengths

SWIR3: 1640-1680 nm

SWIR5: 2145-2185 nm

Code Examples

alteration.py

References

Volesky et al. (2003)