Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli group of rocks, Rajasthan, India

Arindam Guha, K. Vinod Kumar, Alok Porwal, Komal Rani, K. C. Sahoo, S. R. Aneesh Kumar, V. Singaraju, R. P. Singh, M. K. Khandelwal, P. V. Raju, P. G. Diwakar

    Research output: Contribution to journalArticle

    Abstract

    This paper applies reflectance spectroscopy and Advanced Space borne thermal emission reflection radiometer (ASTER)data processing to delineate dolomite-hosted rock phosphate around Udaipur City, Western India, using visible-near infrared (VNIR)and short wave infrared (SWIR)bands of the ASTER sensor. A number of ASTER image spectra and field spectra (resampled to ASTER bands)of pure dolomite and rock phosphate are compared and found to be consistent in terms of the presence of absorption minima at 2.3 µm for dolomite and the absence of the same feature in the spectra of the rock-phosphate. Before attempting spectral mapping, ASTER SWIR band data are clipped using the spatial extent of host rock; which has been prepared from the reference geological map and consequently updated using VNIR-SWIR derived image enhanced products at selected part of the study areas. Two sub-pixel spectral methods namely adaptive coherence estimator (ACE)and matched filtering (MF)methods are applied to ASTER SWIR bands to delineate rock-phosphate-rich zones within dolomite. The output images of the above algorithms are integrated in a principal component (PC)image to delineate phosphate pixels. A principal component; which has similar sign of Eigen vector loading for ACE and MF abundance image is used to delineate rock phosphate within dolomite. The results are validated in the field using a qualitative colorimetric method and also by comparing image spectra of spectrally anomalous zone with the ASTER resampled laboratory spectra of rock phosphate samples. A number of sporadic but important patches of phosphate rich zones in addition to the main surface exposures of the Jhamar Kotra Mine are confirmed in the field. The proposed method is a novel application of spectral mapping of phosphate deposits in dolomitic and carbonatic rocks and present approach of ASTER data processing can be used to delineate phosphate rich zones occurring within similar geological provinces in any parts of the world.

    Original languageEnglish
    Pages (from-to)73-87
    Number of pages15
    JournalOre Geology Reviews
    Volume108
    Issue numberSI
    DOIs
    Publication statusPublished - 1 May 2019

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    phosphate rock
    Radiometers
    radiometer
    reflectance
    Phosphates
    spectroscopy
    Rocks
    Spectroscopy
    dolomite
    rock
    Infrared radiation
    phosphate
    near infrared
    pixel
    Phosphate deposits
    Pixels
    Hot Temperature
    host rock
    sensor
    method

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    Guha, Arindam ; Vinod Kumar, K. ; Porwal, Alok ; Rani, Komal ; Sahoo, K. C. ; Aneesh Kumar, S. R. ; Singaraju, V. ; Singh, R. P. ; Khandelwal, M. K. ; Raju, P. V. ; Diwakar, P. G. / Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli group of rocks, Rajasthan, India. In: Ore Geology Reviews. 2019 ; Vol. 108, No. SI. pp. 73-87.
    @article{31240727c23940bba0e4bb9aee136c3b,
    title = "Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli group of rocks, Rajasthan, India",
    abstract = "This paper applies reflectance spectroscopy and Advanced Space borne thermal emission reflection radiometer (ASTER)data processing to delineate dolomite-hosted rock phosphate around Udaipur City, Western India, using visible-near infrared (VNIR)and short wave infrared (SWIR)bands of the ASTER sensor. A number of ASTER image spectra and field spectra (resampled to ASTER bands)of pure dolomite and rock phosphate are compared and found to be consistent in terms of the presence of absorption minima at 2.3 µm for dolomite and the absence of the same feature in the spectra of the rock-phosphate. Before attempting spectral mapping, ASTER SWIR band data are clipped using the spatial extent of host rock; which has been prepared from the reference geological map and consequently updated using VNIR-SWIR derived image enhanced products at selected part of the study areas. Two sub-pixel spectral methods namely adaptive coherence estimator (ACE)and matched filtering (MF)methods are applied to ASTER SWIR bands to delineate rock-phosphate-rich zones within dolomite. The output images of the above algorithms are integrated in a principal component (PC)image to delineate phosphate pixels. A principal component; which has similar sign of Eigen vector loading for ACE and MF abundance image is used to delineate rock phosphate within dolomite. The results are validated in the field using a qualitative colorimetric method and also by comparing image spectra of spectrally anomalous zone with the ASTER resampled laboratory spectra of rock phosphate samples. A number of sporadic but important patches of phosphate rich zones in addition to the main surface exposures of the Jhamar Kotra Mine are confirmed in the field. The proposed method is a novel application of spectral mapping of phosphate deposits in dolomitic and carbonatic rocks and present approach of ASTER data processing can be used to delineate phosphate rich zones occurring within similar geological provinces in any parts of the world.",
    keywords = "Adaptive coherence estimator, Aravalli Province dolomite, ASTER, Match filtering, Rock phosphate, Spectral unmixing, Spectroscopy",
    author = "Arindam Guha and {Vinod Kumar}, K. and Alok Porwal and Komal Rani and Sahoo, {K. C.} and {Aneesh Kumar}, {S. R.} and V. Singaraju and Singh, {R. P.} and Khandelwal, {M. K.} and Raju, {P. V.} and Diwakar, {P. G.}",
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    Guha, A, Vinod Kumar, K, Porwal, A, Rani, K, Sahoo, KC, Aneesh Kumar, SR, Singaraju, V, Singh, RP, Khandelwal, MK, Raju, PV & Diwakar, PG 2019, 'Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli group of rocks, Rajasthan, India' Ore Geology Reviews, vol. 108, no. SI, pp. 73-87. https://doi.org/10.1016/j.oregeorev.2018.02.021

    Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli group of rocks, Rajasthan, India. / Guha, Arindam; Vinod Kumar, K.; Porwal, Alok; Rani, Komal; Sahoo, K. C.; Aneesh Kumar, S. R.; Singaraju, V.; Singh, R. P.; Khandelwal, M. K.; Raju, P. V.; Diwakar, P. G.

    In: Ore Geology Reviews, Vol. 108, No. SI, 01.05.2019, p. 73-87.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli group of rocks, Rajasthan, India

    AU - Guha, Arindam

    AU - Vinod Kumar, K.

    AU - Porwal, Alok

    AU - Rani, Komal

    AU - Sahoo, K. C.

    AU - Aneesh Kumar, S. R.

    AU - Singaraju, V.

    AU - Singh, R. P.

    AU - Khandelwal, M. K.

    AU - Raju, P. V.

    AU - Diwakar, P. G.

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    N2 - This paper applies reflectance spectroscopy and Advanced Space borne thermal emission reflection radiometer (ASTER)data processing to delineate dolomite-hosted rock phosphate around Udaipur City, Western India, using visible-near infrared (VNIR)and short wave infrared (SWIR)bands of the ASTER sensor. A number of ASTER image spectra and field spectra (resampled to ASTER bands)of pure dolomite and rock phosphate are compared and found to be consistent in terms of the presence of absorption minima at 2.3 µm for dolomite and the absence of the same feature in the spectra of the rock-phosphate. Before attempting spectral mapping, ASTER SWIR band data are clipped using the spatial extent of host rock; which has been prepared from the reference geological map and consequently updated using VNIR-SWIR derived image enhanced products at selected part of the study areas. Two sub-pixel spectral methods namely adaptive coherence estimator (ACE)and matched filtering (MF)methods are applied to ASTER SWIR bands to delineate rock-phosphate-rich zones within dolomite. The output images of the above algorithms are integrated in a principal component (PC)image to delineate phosphate pixels. A principal component; which has similar sign of Eigen vector loading for ACE and MF abundance image is used to delineate rock phosphate within dolomite. The results are validated in the field using a qualitative colorimetric method and also by comparing image spectra of spectrally anomalous zone with the ASTER resampled laboratory spectra of rock phosphate samples. A number of sporadic but important patches of phosphate rich zones in addition to the main surface exposures of the Jhamar Kotra Mine are confirmed in the field. The proposed method is a novel application of spectral mapping of phosphate deposits in dolomitic and carbonatic rocks and present approach of ASTER data processing can be used to delineate phosphate rich zones occurring within similar geological provinces in any parts of the world.

    AB - This paper applies reflectance spectroscopy and Advanced Space borne thermal emission reflection radiometer (ASTER)data processing to delineate dolomite-hosted rock phosphate around Udaipur City, Western India, using visible-near infrared (VNIR)and short wave infrared (SWIR)bands of the ASTER sensor. A number of ASTER image spectra and field spectra (resampled to ASTER bands)of pure dolomite and rock phosphate are compared and found to be consistent in terms of the presence of absorption minima at 2.3 µm for dolomite and the absence of the same feature in the spectra of the rock-phosphate. Before attempting spectral mapping, ASTER SWIR band data are clipped using the spatial extent of host rock; which has been prepared from the reference geological map and consequently updated using VNIR-SWIR derived image enhanced products at selected part of the study areas. Two sub-pixel spectral methods namely adaptive coherence estimator (ACE)and matched filtering (MF)methods are applied to ASTER SWIR bands to delineate rock-phosphate-rich zones within dolomite. The output images of the above algorithms are integrated in a principal component (PC)image to delineate phosphate pixels. A principal component; which has similar sign of Eigen vector loading for ACE and MF abundance image is used to delineate rock phosphate within dolomite. The results are validated in the field using a qualitative colorimetric method and also by comparing image spectra of spectrally anomalous zone with the ASTER resampled laboratory spectra of rock phosphate samples. A number of sporadic but important patches of phosphate rich zones in addition to the main surface exposures of the Jhamar Kotra Mine are confirmed in the field. The proposed method is a novel application of spectral mapping of phosphate deposits in dolomitic and carbonatic rocks and present approach of ASTER data processing can be used to delineate phosphate rich zones occurring within similar geological provinces in any parts of the world.

    KW - Adaptive coherence estimator

    KW - Aravalli Province dolomite

    KW - ASTER

    KW - Match filtering

    KW - Rock phosphate

    KW - Spectral unmixing

    KW - Spectroscopy

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