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dc.contributor.authorHarris, Jennifer
dc.contributor.authorCousins, C. R.
dc.contributor.authorClaire, M. W.
dc.contributor.editorMichel, Ulrich
dc.contributor.editorSchulz, Karsten
dc.contributor.editorEhlers, Manfred
dc.contributor.editorNikolakopoulos, Konstantinos G.
dc.contributor.editorCivco, Daniel
dc.identifier.citationHarris , J , Cousins , C R & Claire , M W 2016 , Spectral identification and quantification of salts in the Atacama Desert . in U Michel , K Schulz , M Ehlers , K G Nikolakopoulos & D Civco (eds) , Earth Resources and Environmental Remote Sensing/GIS Applications VII . vol. 10005 , 100050I , Proceedings of SPIE , vol. 10005 , SPIE , Earth Resources and Environmental Remote Sensing/GIS Applications VII , Edinburgh , United Kingdom , 27/09/16 .
dc.identifier.otherPURE: 248745652
dc.identifier.otherPURE UUID: 058bc4e3-6d3e-4c85-bc2f-bc2acbdae892
dc.identifier.otherRIS: urn:9890033A12FDFA9E90A1560BA40E15E2
dc.identifier.otherScopus: 85010817857
dc.identifier.otherORCID: /0000-0001-9518-089X/work/34103238
dc.identifier.otherORCID: /0000-0002-3954-8079/work/60196583
dc.identifier.otherWOS: 000391483900015
dc.descriptionThis work was part-funded by a Research Incentive Grant from The Carnegie Trust (REF: 70335) and a Royal Society of Edinburgh Research Fellowship to C. Cousins. J, Harris acknowledges funding from STFC (consolidated grant ST/N000528/1).en
dc.description.abstractSalt minerals are an important natural resource. The ability to quickly and remotely identify and quantify salt deposits and salt contaminated soils and sands is therefore a priority goal for the various industries and agencies that utilise salts. The advent of global hyperspectral imagery from instruments such as Hyperion on NASA’s Earth-Observing 1 satellite has opened up a new source of data that can potentially be used for just this task. This study aims to assess the ability of Visible and Near Infrared (VNIR) spectroscopy to identify and quantify salt minerals through the use of spectral mixture analysis. The surface and near-surface soils of the Atacama Desert in Chile contain a variety of well-studied salts, which together with low cloud coverage, and high aridity, makes this region an ideal testbed for this technique. Two forms of spectral data ranging 0.35 – 2.5 μm were collected: laboratory spectra acquired using an ASD FieldSpec Pro instrument on samples from four locations in the Atacama desert known to have surface concentrations of sulfates, nitrates, chlorides and perchlorates; and images from the EO-1 satellite’s Hyperion instrument taken over the same four locations. Mineral identifications and abundances were confirmed using quantitative XRD of the physical samples. Spectral endmembers were extracted from within the laboratory and Hyperion spectral datasets and together with additional spectral library endmembers fed into a linear mixture model. The resulting identification and abundances from both dataset types were verified against the sample XRD values. Issues of spectral scale, SNR and how different mineral spectra interact are considered, and the utility of VNIR spectroscopy and Hyperion in particular for mapping specific salt concentrations in desert environments is established. Overall, SMA was successful at estimating abundances of sulfate minerals, particularly calcium sulfate, from both hyperspectral image and laboratory sample spectra, while abundance estimation of other salt phase spectral end-members was achieved with a higher degree of error.
dc.relation.ispartofEarth Resources and Environmental Remote Sensing/GIS Applications VIIen
dc.relation.ispartofseriesProceedings of SPIEen
dc.rightsCopyright © 2016, Society of Photo-Optical Instrumentation Engineers. This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at:
dc.subjectSpectra Mixture Analysisen
dc.subjectAtacama Deserten
dc.subjectGE Environmental Sciencesen
dc.titleSpectral identification and quantification of salts in the Atacama Deserten
dc.typeConference itemen
dc.contributor.sponsorCarnegie Trusten
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. St Andrews Isotope Geochemistryen

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