ENVI provides the following indices for mineral features:

Alunite Index (ALUI)

ALUI = (p2260*p2165) / (p2260*p2330)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "A Stabilized Vegetation Index and Several Mineralogic Indices Defined for ASTER VNIR and SWIR Data." Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), July 2003.

Calcite Index (CALI)

CALI = (p2205/p2330) * (p2395/p2330)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "Lithologic Mapping with Multispectral ASTER TIR and SWIR Data." Proceedings of SPIE – The International Society for Optical Engineering, February 2004.

Carbonate Index (CARI)

CARI = p10600/p11300

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "Mapping Quartz, Carbonate Minerals, and Mafi Cultramafic Rocks Using Remotely Sensed Multispectral Thermal Infrared ASTER Data." Proceedings of SPIE – The International Society for Optical Engineering, March 2002.

Clay Alteration Index (CLAI)

CLAI = (p1650+p2205) / p2165

See Narrowband Definitions for the allowable range of wavelengths.

References: Rowan, L., and J. Mars. "Lithological Mapping in the Mountain Pass, California Area Using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data." Remote Sensing of Environment, Vol. 84, No. 3 (2003): 350-366.

Dolomite Index (DOLI)

DOLI = (p2205+p2330) / p2300

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Fatima, K., and A.U. Rehman. "Minerals Identification and Mapping Using ASTER Satellite Image." Journal of Applied Remote Sensing Vol. 11, No. 4 (2017).

Epidote / Chlorite / Amphibole Index (ECAI)

ECAI = (p2205+p2395) / (p2300+p2330)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Rowan, L., and J. Mars. "Lithological Mapping in the Mountain Pass, California Area Using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data." Remote Sensing of Environment, Vol. 84, No. 3 (2003): 350-366.

Ferric Iron Alteration Index (FEAI)

FEAI = (p2165/p820) + (p560/tm3)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Mamouch, Y., et al. "Mapping of Hydrothermal Alteration Zones in the Kelaat M’Couna Region Using Airborne Gamma-Ray Spectrometry and Remote Sensing Data: Mining Implications (Eastern Anti-Atlas, Morocco)." Applied Sciences, Vol. 12, No. 957 (2022).

Ferrous Iron (Fe2+) Index (FEI)

FEI = (p2165+p820) / (p560+tm3)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Rowan, L., and J. Mars. "Lithological Mapping in the Mountain Pass, California Area Using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data." Remote Sensing of Environment, Vol. 84, No. 3 (2003): 350-366.

Ferrous Silicates Index (FESI)

FESI = p2165/p1650

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Commonwealth Scientific and Industrial Research Organisation (CSIRO). "Satellite ASTER Geoscience Product Notes for Australia." EP-30-07-12-44, August 2012.

Hydroxyl-Bearing (OH) Altered Minerals Index 1 (OHI1)

OHI1 = (p2260/p2205) * (p1650/p2205)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "A Stabilized Vegetation Index and Several Mineralogic Indices Defined for ASTER VNIR and SWIR Data." Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), July 2003.

Hydroxyl-Bearing (OH) Altered Minerals Index 2 (OHI2)

OHI2 = (p1650*p2260) / (p2205*p2205)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "A Stabilized Vegetation Index and Several Mineralogic Indices Defined for ASTER VNIR and SWIR Data." Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), July 2003.

Hydroxyl-Bearing (OH) Altered Minerals Index 3 (OHI3)

OHI3 = (p1650*p2260) / (p2165*p2165)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "A Stabilized Vegetation Index and Several Mineralogic Indices Defined for ASTER VNIR and SWIR Data." Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), July 2003.

Kaolinite Index 1 (KAI1)

KAI1 = p2300/p2165

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Fatima, K., and A.U. Rehman. "Minerals Identification and Mapping Using ASTER Satellite Image." Journal of Applied Remote Sensing Vol. 11, No. 4 (2017).

Kaolinite Index 2 (KAI2)

KAI2 = (p1650/p2165) * (p2330/p2205)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "A Stabilized Vegetation Index and Several Mineralogic Indices Defined for ASTER VNIR and SWIR Data." Proceedings of the IEEE International Geoscience and Remote Sensing Symposium (IGARSS), July 2003.

Kaolinite Index 3 (KAI3)

KAI3 = (p1650+p2260) / p2205

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Fatima, K., and A.U. Rehman. "Minerals Identification and Mapping Using ASTER Satellite Image." Journal of Applied Remote Sensing Vol. 11, No. 4 (2017).

Laterite Index (LATI)

LATI = p1650/p560

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Guha, A., et al. "Analysis of ASTER Data for Mapping Bauxite Rich Pockets Within High Altitude Lateritic Bauxite, Jharkhand, India." International Journal of Applied Earth Observation and Geoinformation 21 (2013): 184-194.

Magnesite Index (MAGI)

MAGI = (p2205+p2330) / (p2260+p2395)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Fatima, K., and A.U. Rehman. "Minerals Identification and Mapping Using ASTER Satellite Image." Journal of Applied Remote Sensing Vol. 11, No. 4 (2017).

MgOH-Carbonate Abundance Index (MGAI)

MGAI = (p2395+p2205) / p2330

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Hewson, R., et al. "Mapping Geology Associated with Manganese Mineralisation Using Spectral Sensing Techniques at Woodie Woodie, East Pilbara." Exploration Geophysics 37 (2006): 389-400.

Montmorillonite Index (MONI)

MONI = (p1650+p2205) / p2260

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Fatima, K., and A.U. Rehman. "Minerals Identification and Mapping Using ASTER Satellite Image." Journal of Applied Remote Sensing Vol. 11, No. 4 (2017).

Muscovite Index (MUSI)

MUSI = p2300/p2205

See Narrowband Definitions for the allowable range of wavelengths.

Phengitic Index (PHEI)

PHEI = p2165/p2205

See Narrowband Definitions for the allowable range of wavelengths.

Phyllic Alteration Index (PHAI)

PHAI = (p2165+p2260) / p2205

See Narrowband Definitions for the allowable range of wavelengths.

References: Mamouch, Y., et al. "Mapping of Hydrothermal Alteration Zones in the Kelaat M’Couna Region Using Airborne Gamma-Ray Spectrometry and Remote Sensing Data: Mining Implications (Eastern Anti-Atlas, Morocco)." Applied Sciences, Vol. 12, No. 957 (2022).

Rowan, L., and J. Mars. "Lithological Mapping in the Mountain Pass, California Area Using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data." Remote Sensing of Environment, Vol. 84, No. 3 (2003): 350-366.

Propylitic Alteration Index (PRAI)

PRAI = (p2260+p2395) / p2330

See Narrowband Definitions for the allowable range of wavelengths.

References: Mamouch, Y., et al. "Mapping of Hydrothermal Alteration Zones in the Kelaat M’Couna Region Using Airborne Gamma-Ray Spectrometry and Remote Sensing Data: Mining Implications (Eastern Anti-Atlas, Morocco)." Applied Sciences, Vol. 12, No. 957 (2022).

Rowan, L., and J. Mars. "Lithological Mapping in the Mountain Pass, California Area Using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data." Remote Sensing of Environment, Vol. 84, No. 3 (2003): 350-366.

Quartz Rich Rocks Index (QRRI)

QRRI = p11300/p9100

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Rowan, L., and J. Mars. "Lithological Mapping in the Mountain Pass, California Area Using Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Data." Remote Sensing of Environment, Vol. 84, No. 3 (2003): 350-366.

Quartz / Siliceous Rocks Index (QSRI)

QSRI = (p8650*p8650) / (p8300*p9100)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "Mapping Quartz, Carbonate Minerals, and Mafi Cultramafic Rocks Using Remotely Sensed Multispectral Thermal Infrared ASTER Data." Proceedings of SPIE – The International Society for Optical Engineering, March 2002.

Silica Dioxide Index (SIDI)

SIDI = p9100/p10600

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Ninomiya, Y. "Mapping Quartz, Carbonate Minerals, and Mafi Cultramafic Rocks Using Remotely Sensed Multispectral Thermal Infrared ASTER Data." Proceedings of SPIE – The International Society for Optical Engineering, March 2002.

Sulfate Index (SULI)

SULI = (p8300*p9100) / (p8650*p8650)

See Narrowband Definitions for the allowable range of wavelengths.

Reference: Öztan, S., and L. Süzen. "Mapping Evaporate Minerals by ASTER." International Journal of Remote Sensing 32 (2011): 1651-1673.

See Also

Spectral Indices