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- Hrishikesh Kumar
- Arindam Guha
- Aditya K. Dagar
- Sumit Pathak
- Komal Rani (Pasricha)
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- K. Vinod Kumar
- William Farrand
- Snehamoy Chatterjee
- S. Ravi
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- Arup Roy Chowdhury
- Arup Banerjee
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- Ankush Kumar
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- Sami Ur Rehman
- Sunil Bhati
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- Amiya Biswas
- Anish R. Saxena
- Satish Sharma
- Sandip R. Somani
- H. V. Bhagat
- Jitendra Sharma
- D. N. Ghonia
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- Mamta Chauhan
- Prabhakar A. Verma
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- Aditya Kumar Dagar
- Amitabh
- Abhishek N. Patil
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- Nilesh Desai
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Bhattacharya, Satadru
- Potential of Airborne Hyperspectral Data for Geo-Exploration over Parts of Different Geological/Metallogenic Provinces in India based on AVIRIS-NG Observations
Abstract Views :198 |
PDF Views:106
Authors
Satadru Bhattacharya
1,
Hrishikesh Kumar
1,
Arindam Guha
2,
Aditya K. Dagar
1,
Sumit Pathak
1,
Komal Rani (Pasricha)
2,
S. Mondal
3,
K. Vinod Kumar
2,
William Farrand
4,
Snehamoy Chatterjee
5,
S. Ravi
6,
A. K. Sharma
1,
A. S. Rajawat
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 042, IN
3 Department of Geophysics, Indian Institute of Technology (ISM), Dhanbad 826 004, IN
4 Space Science Institute, Boulder, Colorado 80301, US
5 Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan 49931, US
6 Geological Survey of India Training Institute, Bandlaguda, Hyderabad 500 068, US
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
2 National Remote Sensing Centre, Indian Space Research Organisation, Hyderabad 500 042, IN
3 Department of Geophysics, Indian Institute of Technology (ISM), Dhanbad 826 004, IN
4 Space Science Institute, Boulder, Colorado 80301, US
5 Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, Michigan 49931, US
6 Geological Survey of India Training Institute, Bandlaguda, Hyderabad 500 068, US
Source
Current Science, Vol 116, No 7 (2019), Pagination: 1143-1156Abstract
In this article, we discuss the potential of airborne hyperspectral data in mapping host rocks of mineral deposits and surface signatures of mineralization using AVIRIS-NG data of a few important geological provinces in India. We present the initial results from the study sites covering parts of northwest India, as well as the Sittampundi Layered Complex (SLC) of Tamil Nadu and the Wajrakarur Kimberlite Field (WKF) of Andhra Pradesh from southern India. Modified spectral summary parameters, originally designed for MRO-CRISM data analysis, have been implemented on AVIRIS-NG mosaic of Jahazpur, Rajasthan for the automatic detection of phyllosilicates, carbonates and Fe–Mg-silicates. Spectral analysis over Ambaji and the surrounding areas indicates the presence of calcite across much of the study area with kaolinite occurring as well in the north and east of the study area. The deepest absorption features at around 2.20 and 2.32 μm and integrated band depth were used to identify and map the spatial distribution of phyllosilicates and carbonates. Suitable thresholds of band depths were applied to map prospective zones for marble exploration. The data over SLC showed potential of AVIRIS-NG hyperspectral data in detecting mafic cumulates and chromitites. We also have demonstrated the potential of AVIRIS-NG data in detecting kimberlite pipe exposures in parts of WKF.Keywords
Data, Geological Provinces, Host Rocks, Hyperspectral, Mineral Deposits.References
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- Imaging Infrared Spectrometer onboard Chandrayaan-2 Orbiter
Abstract Views :252 |
PDF Views:87
Authors
Arup Roy Chowdhury
1,
Arup Banerjee
1,
S. R. Joshi
1,
Moumita Dutta
1,
Ankush Kumar
1,
Satadru Bhattacharya
1,
Amitabh
1,
Sami Ur Rehman
1,
Sunil Bhati
1,
J. C. Karelia
1,
Amiya Biswas
1,
Anish R. Saxena
1,
Satish Sharma
1,
Sandip R. Somani
1,
H. V. Bhagat
1,
Jitendra Sharma
1,
D. N. Ghonia
1,
B. B. Bokarwadia
1,
Ajay Parasar
1
Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, IN
Source
Current Science, Vol 118, No 3 (2020), Pagination: 368-375Abstract
Imaging Infrared Spectrometer (IIRS) is an imaging hyperspectral instrument for mineralogy of the lunar surface (including the hydroxyl signature). IIRS operates in the 0.8–5 μm spectral range with about 250 contiguous bands. It has 80 m ground sampling distance and 20 km swath at nadir from 100 km orbit altitude. Optical design is based on fore-optics and Offner (convex multi-blazed grating)-type spectrometer. Focal plane array is HgCdTe (mercury–cadmium–telluride)- based actively cooled to 90 K, having 500 × 256 pixels format with 30 μm pixel size. Electronics comprises proximity, logic and control, power supply and cooler drive electronics. Mechanical system is realized to house various subsystems, namely optics, detector, electronics and thermal components meeting the structural, opto-mechanical thermal component and alignment requirements. Thermal system is designed such that the instrument is cooled and maintained at fixed temperature to reduce and control instrument background. Aluminum-based mirror, grating and housing are developed to maintain structural as well as opto-mechanical and thermal requirements. This article presents IIRS realization and spectroradoimetric performance.Keywords
Hyperspectral Imaging, Infrared Spectrometer, Moon, Orbiter.References
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- Unambiguous detection of OH and H2O on the Moon from Chandrayaan-2 Imaging Infrared Spectrometer reflectance data using 3 μm hydration feature
Abstract Views :216 |
PDF Views:83
Authors
Prakash Chauhan
1,
Mamta Chauhan
1,
Prabhakar A. Verma
1,
Supriya Sharma
1,
Satadru Bhattacharya
2,
Aditya Kumar Dagar
3,
Amitabh
3,
Abhishek N. Patil
3,
Ajay Kumar Parashar
3,
Ankush Kumar
3,
Nilesh Desai
3,
Ritu Karidhal
4,
A. S. Kiran Kumar
5
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, IN
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, IN
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, IN
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, IN
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, IN
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, IN
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, IN
Source
Current Science, Vol 121, No 3 (2021), Pagination: 391-401Abstract
Imaging Infrared Spectrometer (IIRS) on-board Chandrayaan-2 is designed to measure lunar reflected and emitted solar radiation in 0.8–5.0 μmm spectral range. Its high spatial resolution (~80 m) and extended spectral range is most suitable to completely characterize lunar hydration (2.8–3.5 μmm region) attributed to the presence of OH and/or H2O. Here we present initial results from IIRS reflectance data analysed to unambiguously detect and quantify lunar 3 μmm absorption feature. After pre-processing and data-reduction, a physics based thermal correction analysis of IIRS reflectance spectra has been done using co-located temperature measurements. Hydration absorption was observed at all latitudes and surface types with varying degrees for all pixels in the study area and its absorption depth shows distinct variability associated with mineralogy, surface temperature and latitude.Keywords
Imaging Infrared Spectrometer, Lunar Hydration, Moon, Reflectance Data, Thermal Correction.References
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- Identification of Smectites by IR and LIBS Instruments of Supercam Suite Onboard Mars 2020 Perseverance Rover: Comments on the Non-retrieval of First Drill Core
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Authors
Affiliations
1 Space Applications Centre (Indian Space Research Organization), Ahmedabad 380 015, IN
2 Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur 721 302, IN
3 Department of Earth and Environmental Science, KSKV Kachchh University, Bhuj 370 001, IN
1 Space Applications Centre (Indian Space Research Organization), Ahmedabad 380 015, IN
2 Department of Geology and Geophysics, Indian Institute of Technology Kharagpur, Kharagpur 721 302, IN
3 Department of Earth and Environmental Science, KSKV Kachchh University, Bhuj 370 001, IN
Source
Current Science, Vol 123, No 1 (2022), Pagination: 93-96Abstract
Preliminary investigations on the Infrared Spectrometer onboard Mars 2020 Perseverance rover show the presence of Fe-/Mg-smectite minerals near the first drilling site, Roubion. Laser-Induced Breakdown Spectrometer data show characteristic emission peaks for O, H and the major constituent elements of smectites, viz. Si, Fe, Mg, etc. These minerals suggest aqueous alteration of the basaltic floor of the Jezero crater. The mechanically weak nature of this basalt weathering layer holds clues to the non-retrieval of the first drill core. Water confinement capacity and high porosity–permeability make the smectite-rich rock units a good host for preserving macro- and microscopic biosignaturesKeywords
Biosignature, Drill Core, Jezero Crater, Rover, Smectites, Spectroscopic AnalysisReferences
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