{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T02:30:07Z","timestamp":1770517807266,"version":"3.49.0"},"reference-count":51,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2019,4,27]],"date-time":"2019-04-27T00:00:00Z","timestamp":1556323200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The contrast in the emissivity spectra of phosphorite and associated carbonate rock can be used as a guide to delineate phosphorite within dolomite. The thermal emissivity spectrum of phosphorite is characterized by a strong doublet emissivity feature with their absorption minima at 9 \u00b5m and 9.5 \u00b5m; whereas, host rock dolomite has relatively subdued emissivity minima at ~9 \u00b5m. Using the contrast in the emissivity spectra of phosphorite and dolomite, data obtained by the thermal bands of Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) sensor were processed to delineate phosphorite within dolomite. A decorrelation stretched ASTER radiance composite could not enhance phosphorite rich zones within the dolomite host rock. However, a decorrelation stretched image composite of selected emissivity bands derived using the emissivity normalization method was suitable to enhance large surface exposures of phosphorite. We have found that the depth of the emissivity minima of phosphorite gradually has increased from dolomite to high-grade phosphorite, while low-grade phosphate has an intermediate emissivity value and the emissivity feature can be studied using three thermal bands of ASTER. In this context, we also propose a relative band depth (RBD) image using selected emissivity bands (bands 11, 12, and 13) to delineate phosphorite from the host rock. We also propose that the RBD image can be used as a proxy to estimate the relative grades of phosphorites, provided the surface exposures of phosphorite are large enough to subdue the role of intrapixel spectral mixing, which can also influence the depth of the diagnostic feature along with the grade. We have validated the phosphorite pixels of the RBD image in the field by carrying out colorimetric analysis to confirm the presence of phosphorite. The result of the study indicates the utility of the proposed relative band depth image derived using ASTER TIR bands for delineating Proterozoic carbonate-hosted phosphorite.<\/jats:p>","DOI":"10.3390\/rs11091003","type":"journal-article","created":{"date-parts":[[2019,4,29]],"date-time":"2019-04-29T02:57:32Z","timestamp":1556506652000},"page":"1003","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Emittance Spectroscopy and Broadband Thermal Remote Sensing Applied to Phosphorite and Its Utility in Geoexploration: A Study in the Parts of Rajasthan, India"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8101-7768","authenticated-orcid":false,"given":"Arindam","family":"Guha","sequence":"first","affiliation":[{"name":"Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization (ISRO) Balanagar, Hyderabad 500037, India"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2554-1060","authenticated-orcid":false,"given":"Yasushi","family":"Yamaguchi","sequence":"additional","affiliation":[{"name":"Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0103-1824","authenticated-orcid":false,"given":"Snehamoy","family":"Chatterjee","sequence":"additional","affiliation":[{"name":"Department of Geological and Mining Engineering and Sciences, Michigan Technological University, Houghton, MI 49931, USA"}]},{"given":"Komal","family":"Rani","sequence":"additional","affiliation":[{"name":"Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization (ISRO) Balanagar, Hyderabad 500037, India"}]},{"given":"Kumranchat","family":"Vinod Kumar","sequence":"additional","affiliation":[{"name":"Geosciences Group, National Remote Sensing Centre, Indian Space Research Organization (ISRO) Balanagar, Hyderabad 500037, India"}]}],"member":"1968","published-online":{"date-parts":[[2019,4,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Choudhuri, R. (1990). Two Decades of Phosphorite Investigations in India, Geological Society.","DOI":"10.1144\/GSL.SP.1990.052.01.22"},{"key":"ref_2","unstructured":"Lane, M.D., Dyar, M.D., and Bishop, J.L. (2007, January 12\u201316). Spectra of phosphate minerals as obtained by visible-near infrared reflectance, thermal infrared emission, and M\u00f6ssbauer laboratory analyses. Proceedings of the Lunar and Planetary Science Conference, League City, TX, USA."},{"key":"ref_3","unstructured":"Tucker, M.E. (2009). Sedimentary Petrology: An Introduction to the Origin of Sedimentary Rocks, John Wiley & Sons. [3rd ed.]."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1329","DOI":"10.1029\/JZ070i006p01329","article-title":"The determination of infrared emissivities of terrestrial surfaces","volume":"70","author":"Buettner","year":"1965","journal-title":"J. Geophys. Res."},{"key":"ref_5","first-page":"299","article-title":"Upper Proterozoic carbonate stratigraphy, diagenesis, and stromatolitic phosphorite formation, Irec\u00ea Basin, Bahia, Brazil","volume":"64","author":"Misi","year":"1994","journal-title":"J. Sediment. Res."},{"key":"ref_6","unstructured":"Cook, P.T., and Shergold, J.H. (1986). Phosphate Deposits of the World, Proterozoic and Cambrian Phosphorites, Cambridge University Press."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"9192","DOI":"10.1029\/JB094iB07p09192","article-title":"Thermal infrared (2.5\u201313.5 \u03bcm) spectroscopic remote sensing of igneous rock types on particulate planetary surfaces","volume":"94","author":"Salisbury","year":"1989","journal-title":"J. Geophys. Res."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1016\/0034-4257(92)90092-X","article-title":"Emissivity of terrestrial materials in the 8\u201314 \u00b5m atmospheric windows","volume":"42","author":"Salisbury","year":"1992","journal-title":"Remote Sens. Environ."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.rse.2005.06.009","article-title":"Detecting lithology with advanced spaceborne thermal emission and reflection radiometer (ASTER) multispectral thermal infrared \u201cradiance-at-sensor\u201d data","volume":"99","author":"Ninomiya","year":"2005","journal-title":"Remote Sens. Environ."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1016\/j.oregeorev.2014.01.005","article-title":"Mafic and ultramafic and quartz-rich rock indices deduced from ASTER thermal infrared data using a linear approximation to the planck function","volume":"60","author":"Ding","year":"2014","journal-title":"Ore Geol. Rev."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"283","DOI":"10.1016\/j.oregeorev.2014.11.006","article-title":"Quartzose\u2013mafic spectral feature space model: A methodology for extracting felsic rocks with ASTER thermal infrared radiance data","volume":"66","author":"Ding","year":"2015","journal-title":"Ore Geol. Rev."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"76","DOI":"10.1016\/j.oregeorev.2015.10.033","article-title":"New ASTER derived thermal indices to delineate mineralogy of different granitoids of Archaean Craton and analysis of their potentials with reference to Ninomiya\u2019s indices for delineating quartz and mafic minerals of granitoids-an analysis in Dharwar Craton, India","volume":"74","author":"Guha","year":"2016","journal-title":"Ore Geol. Rev."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Rani, K., Guha, A., Pal, S.K., and Vinod Kumar, K. (2019). Comparative analysis of potentials of ASTER thermal infrared band derived emissivity composite, radiance composite and emissivity-temperature composite in geological mapping of Proterozoic rocks in parts Banswara, Rajasthan. J. Indian Soc. Remote Sens.","DOI":"10.1007\/s12524-017-0737-z"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1016\/j.jag.2011.08.002","article-title":"Multi-and hyperspectral geologic remote sensing: A review","volume":"14","author":"Hecker","year":"2012","journal-title":"Int. Appl. Earth Observ. Geoinf."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1062","DOI":"10.1109\/36.700991","article-title":"Overview of advanced spaceborne thermal emission and reflection radiometer (ASTER)","volume":"36","author":"Yamaguchi","year":"1998","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"847","DOI":"10.1080\/014311600210326","article-title":"The advanced spaceborne thermal emission and reflection radiometer (ASTER): Data products for the high spatial resolution imager on NASA\u2019s Terra platform","volume":"21","author":"Abrams","year":"2000","journal-title":"Int. J. Remote Sens."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"225","DOI":"10.1080\/02757259509532286","article-title":"Surface temperature and emissivity at various scales: Definition, measurement and related problems","volume":"12","author":"Becker","year":"1995","journal-title":"Remote Sens. Rev."},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Tang, H., and Li, Z.L. (2014). Quantitative Remote Sensing in Thermal Infrared: Theory and Applications, Springer.","DOI":"10.1007\/978-3-642-42027-6"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/j.rse.2005.04.027","article-title":"Mineral mapping on the Chilean\u2013Bolivian Altiplano using co-orbital ALI, ASTER and Hyperion imagery: Data dimensionality issues and solutions","volume":"99","author":"Hubbard","year":"2005","journal-title":"Remote Sens. Environ."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"159","DOI":"10.1016\/j.rse.2005.04.025","article-title":"Seamless geological map generation using ASTER in the Broken Hill-Curnamona province of Australia","volume":"99","author":"Hewson","year":"2005","journal-title":"Remote Sens. Environ."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"344","DOI":"10.1016\/j.rse.2007.03.015","article-title":"Integrating visible, near-infrared and short-wave infrared hyperspectral and multispectral thermal imagery for geological mapping at Cuprite, Nevada","volume":"110","author":"Chen","year":"2007","journal-title":"Remote Sens. Environ."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"2259","DOI":"10.1016\/j.rse.2010.05.002","article-title":"Imaging spectroscopy of jarosite cement in the Jurassic Navajo Sandstone","volume":"114","author":"Bell","year":"2010","journal-title":"Remote Sens. Environ."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"629","DOI":"10.1080\/10106049.2010.519787","article-title":"Remote sensing of Carhuarazo volcanic complex using ASTER imagery in Southern Peru to detect alteration zones and volcanic structures\u2013a combined approach of image processing in ENVI and ArcGIS\/ArcScene","volume":"25","author":"Brandmeier","year":"2010","journal-title":"Geocarto Int."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"60","DOI":"10.1016\/j.asr.2010.08.021","article-title":"Mineral mapping in the Kap Simpson complex, central East Greenland, using HyMap and ASTER remote sensing data","volume":"47","author":"Bedini","year":"2011","journal-title":"Adv. Space Res."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1571","DOI":"10.1080\/014311697218287","article-title":"A comparison of thermal infrared emissivity spectra measured in situ, in the laboratory, and derived from thermal infrared multispectral scanner (TIMS) data in Cuprite, Nevada, USA","volume":"18","author":"Ninomiya","year":"1997","journal-title":"Int. J. Remote Sens."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"141","DOI":"10.1016\/j.jafrearsci.2010.01.007","article-title":"Processing and interpretation of ASTER TIR data for mapping of rare-metal-enriched albite granitoids in the Central Eastern Desert of Egypt","volume":"58","author":"Aboelkhair","year":"2010","journal-title":"J. Afr. Earth Sci."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.jtusci.2013.01.001","article-title":"Integration of the ASTER thermal infra-red bands imageries with geological map of Jabal Al Hasir area, AsirTerrane, the Arabian Shield","volume":"7","author":"Matar","year":"2013","journal-title":"J. Taibah Univ. Sci."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"134","DOI":"10.1016\/j.oregeorev.2013.01.005","article-title":"Geological mapping of the Francistown area in north-eastern Botswana by surface temperature and spectral emissivity information derived from advanced spaceborne thermal emission and reflection radiometer (ASTER) thermal infrared data","volume":"53","author":"Yajima","year":"2013","journal-title":"Ore Geol. Rev."},{"key":"ref_29","first-page":"205","article-title":"Lithological and mineralogical survey of the Oyu Tolgoi region, Southeastern Gobi, Mongolia using ASTER reflectance and emissivity data","volume":"26","author":"Son","year":"2014","journal-title":"Int. J. Appl. Earth Observ. Geoinf."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Guha, A., Vinod Kumar, K., Porwal, A., Rani, K., Singaraju, V., Singh, R.P., Khandelwal, M.K., Raju, P.V., and Diwakar, P.G. (2018). Reflectance spectroscopy and ASTER based mapping of rock-phosphate in parts of Paleoproterozoic sequences of Aravalli Group of rocks, Rajasthan, India. Ore Geol. Rev.","DOI":"10.1016\/j.oregeorev.2018.02.021"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1429","DOI":"10.1029\/JB092iB02p01429","article-title":"Spectral reflectance of carbonate minerals in visible and near infrared: Anhydrous carbonate minerals","volume":"92","author":"Gaffey","year":"1987","journal-title":"J. Geophys. Res."},{"key":"ref_32","first-page":"151","article-title":"Spectral reflectance of-carbonate minerals in the visible and near infrared (0.35\u20132.55 microns): Calcite, aragonite, and dolomite","volume":"71","author":"Gaffey","year":"1986","journal-title":"Am. Mineral."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1016\/S0034-4257(99)00049-8","article-title":"Evaluation of six methods for extracting relative emissivity spectra from thermal infrared images","volume":"69","author":"Li","year":"1999","journal-title":"Remote Sens. Environ."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"14","DOI":"10.1016\/j.rse.2012.12.008","article-title":"Satellite derived land surface temperature: Current status and perspectives","volume":"131","author":"Li","year":"2013","journal-title":"Remote Sens. Environ."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"860","DOI":"10.1080\/10106049.2015.1086904","article-title":"Integrated approach of using aster derived emissivity and radiant temperature for delineating different granitoids\u2014a case study in parts of Dharwar Craton, India","volume":"31","author":"Guha","year":"2015","journal-title":"Geocarto Int."},{"key":"ref_36","first-page":"121","article-title":"Stratigraphy of the Aravalli Supergroup in the type area","volume":"7","author":"Roy","year":"1988","journal-title":"Geol. Soc. India Mem."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"239","DOI":"10.1016\/0301-9268(86)90024-0","article-title":"Genesis of upper proterozoic Cambrian phosphorite deposits of India: Isotopic inferences from carbonate fluroapatite, carbonate and organic carbon","volume":"33","author":"Banerjee","year":"1986","journal-title":"Precambrian Res."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/0301-9268(81)90035-8","article-title":"Evolution of lower Proterozoic epicontinental deposits: Stromatolite-bearing Aravalli rocks of Udaipur, Rajasthan, India","volume":"14","author":"Roy","year":"1981","journal-title":"Precambrian Res."},{"key":"ref_39","first-page":"292","article-title":"The advanced spaceborne thermal emission and reflection radiometer (ASTER) after fifteen years: Review of global products","volume":"38","author":"Abrams","year":"2015","journal-title":"Int. J. Appl. Earth Observ. Geoinf."},{"key":"ref_40","unstructured":"NASA (2016, January 01). ASTER, Available online: https:\/\/asterweb.jpl.nasa.gov\/."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/0034-4257(92)90096-3","article-title":"A comparison of techniques for extracting emissivity information fromthermal infrared data for geologic studies","volume":"42","author":"Hook","year":"1992","journal-title":"Remote Sens. Environ."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"1155","DOI":"10.1109\/36.317447","article-title":"Separating temperature and emissivity in thermal infrared multispectral scanner data: Implications for recovering land surface temperatures","volume":"31","author":"Kealy","year":"1993","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_43","unstructured":"(2018, June 15). D&P Instruments. Available online: http:\/\/www.dpinstruments.com\/."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"14899","DOI":"10.1029\/97JB00593","article-title":"Quantitative thermal emission spectroscopy of minerals: A laboratory technique for measurement and calibration","volume":"102","author":"Ruff","year":"1997","journal-title":"J. Geophys. Res."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"9735","DOI":"10.1029\/1998JE000624","article-title":"A thermal emission spectral library of rock-forming minerals","volume":"105","author":"Christensen","year":"2000","journal-title":"J. Geophys. Res. Planets"},{"key":"ref_46","doi-asserted-by":"crossref","unstructured":"Kokaly, R.F., Clark, R.N., Swayze, G.A., Livo, K.E., Hoefen, T.M., Pearson, N.C., Wise, R.A., Benzel, W.M., Lowers, H.A., and Driscoll, R.L. (2017). USGS Spectral Library Version 7.","DOI":"10.3133\/ds1035"},{"key":"ref_47","unstructured":"Johnson, B.R., and Young, S.J. (1998). In-Scene Atmospheric Compensation: Application to SEBASS Data Collected at the ARM Site, Technical Report, Space and Environment Technology Center, The Aerospace Corporation."},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"25593","DOI":"10.1029\/97JE01874","article-title":"Determination of Martian meteorite lithologies and mineralogies using vibrational spectroscopy","volume":"102","author":"Hamilton","year":"1997","journal-title":"J. Geophys. Res. Planets"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"9701","DOI":"10.1029\/1999JE001112","article-title":"Thermal infrared emission spectroscopy of the pyroxene mineral series","volume":"105","author":"Hamilton","year":"2000","journal-title":"J. Geophys. Res. Planets"},{"key":"ref_50","first-page":"633","article-title":"Colorimetric estimation of phosphorus in steels","volume":"32","author":"Mission","year":"1908","journal-title":"Chemiker Zeitung"},{"key":"ref_51","unstructured":"Wynn, J.C., Bazzari, M., Bawajeeh, A., Tarabulsi, Y., Showail, A., Hajnoor, M.O., Techico, L., and Wynn, J.P. (1994). Phosphate Content Derived from Well Logging, Al Jalamid Phosphate Deposit, Northern Saudi Arabia."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/11\/9\/1003\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T12:47:36Z","timestamp":1760186856000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/11\/9\/1003"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,4,27]]},"references-count":51,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2019,5]]}},"alternative-id":["rs11091003"],"URL":"https:\/\/doi.org\/10.3390\/rs11091003","relation":{},"ISSN":["2072-4292"],"issn-type":[{"value":"2072-4292","type":"electronic"}],"subject":[],"published":{"date-parts":[[2019,4,27]]}}}