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Spectral Analysis to Explore Gypsum Deposits and Its Association with Palaeochannels and Lithology Using PRISMA, Sentinel 2, and Dual-Polarimetric SAR Data in Bikaner, Rajasthan, Bharat.

Spectral Analysis to Explore Gypsum Deposits and Its Association with Palaeochannels and Lithology Using PRISMA, Sentinel 2, and Dual-Polarimetric SAR Data in Bikaner, Rajasthan, Bharat.

Authors :
Biswas, Raja
Rathore, V. S.
Source :
Journal of the Indian Society of Remote Sensing; Dec2024, Vol. 52 Issue 12, p2769-2781, 13p
Publication Year :
2024

Abstract

Evaporites like calcrete and gypsum are found largely in arid regions in association with playas, palaeochannels, and different source rocks. Identification and precise mapping of these minerals is important for the economy. The present study aims to identify and map the spatial distribution of gypsum in the Bikaner district (an arid region in western Rajasthan, Bharat) based on the analysis of distinct spectral responses. Recently high spectral resolution and atmospherically corrected PRISMA data were used in this study. During the initial processing of the data, bad bands were spectrally subset after a detailed visual inspection. Also, a minimum noise fraction was performed to remove noise as well as to reduce the dimensionality of the data as per the analysis of eigenvalues. Then, the distribution map of gypsum was generated using the application of Spectral Angle Mapper after matching the spectra obtained from the spectral library and image. The results were validated through a detailed field investigation as well as from lab-based analysis like X-ray Diffraction. Moreover, we have delineated a course of a palaeochannel based on the interpretation of ALOS PALSAR, Sentinel-2A, and their fused images using two different fusion algorithms such as Gram Schmidt and Intensity Hue and Saturation. Our analysis revealed that the gypsum deposits are mostly situated along the identified palaeochannel and with lithology such as fine aeolian sand and calcrete (Kankar). [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
0255660X
Volume :
52
Issue :
12
Database :
Complementary Index
Journal :
Journal of the Indian Society of Remote Sensing
Publication Type :
Academic Journal
Accession number :
181644099
Full Text :
https://doi.org/10.1007/s12524-024-01865-7