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Optimized Lithological Mapping from Multispectral and Hyperspectral Remote Sensing Images Using Fused Multi-Classifiers
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering. Center of Studies in Resources Engineering, Indian Institute of Technology Bombay, Mumbai, India.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-1629-2920
Center of Studies in Resources Engineering, Indian Institute of Technology Bombay, Mumbai, India.
2020 (English)In: Remote Sensing, ISSN 2072-4292, E-ISSN 2072-4292, Vol. 12, no 1, article id 177Article in journal (Refereed) Published
Abstract [en]

Most available studies in lithological mapping using spaceborne multispectral and hyperspectral remote sensing images employ different classification and spectral matching algorithms for performing this task; however, our experiment reveals that no single algorithm renders satisfactory results. Therefore, a new approach based on an ensemble of classifiers is presented for lithological mapping using remote sensing images in this paper, which returns enhanced accuracy. The proposed method uses a weighted pooling approach for lithological mapping at each pixel level using the agreement of the class accuracy, overall accuracy and kappa coefficient from the multi-classifiers of an image. The technique is implemented in four steps; (1) classification images are generated using a variety of classifiers; (2) accuracy assessments are performed for each class, overall classification and estimation of kappa coefficient for every classifier; (3) an overall within-class accuracy index is estimated by weighting class accuracy, overall accuracy and kappa coefficient for each class and every classifier; (4) finally each pixel is assigned to a class for which it has the highest overall within-class accuracy index amongst all classes in all classifiers. To demonstrate the strength of the developed approach, four supervised classifiers (minimum distance (MD), spectral angle mapper (SAM), spectral information divergence (SID), support vector machine (SVM)) are used on one hyperspectral image (Hyperion) and two multispectral images (ASTER, Landsat 8-OLI) for mapping lithological units of the Udaipur area, Rajasthan, western India. The method is found significantly effective in increasing the accuracy in lithological mapping.

Place, publisher, year, edition, pages
MDPI, 2020. Vol. 12, no 1, article id 177
Keywords [en]
remote sensing, hyperspectral, multispectral, Hyperion, ASTER, Landsat 8-OLI, classification, lithological mapping
National Category
Geophysics
Research subject
Exploration Geophysics
Identifiers
URN: urn:nbn:se:ltu:diva-78290DOI: 10.3390/rs12010177ISI: 000515391700177OAI: oai:DiVA.org:ltu-78290DiVA, id: diva2:1420994
Note

Validerad;2020;Nivå 2;2020-04-01 (johcin)

Available from: 2020-04-01 Created: 2020-04-01 Last updated: 2020-04-01Bibliographically approved

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Rasmussen, Thorkild

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