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Mapping the wavelength position of mineral features in hyperspectral thermal infrared data / Christoph Hecker in International journal of applied Earth observation and geoinformation, vol 79 (July 2019)  

Public [article]  inInternational journal of applied Earth observation and geoinformation > vol 79 (July 2019) . - pp 133-140 Titre : Mapping the wavelength position of mineral features in hyperspectral thermal infrared data Type de document : Article/Communication Auteurs : Christoph Hecker, Auteur ; Frank J.A. Van Ruitenbeek, Auteur ; Wim H. Bakker, Auteur ; Babatunde J. Fagbohun, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 133-140 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes descripteurs IGN] carte géologique [Termes descripteurs IGN] feldspath [Termes descripteurs IGN] filtrage du bruit [Termes descripteurs IGN] image aérienne [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] image infrarouge [Termes descripteurs IGN] image thermique [Termes descripteurs IGN] longueur d'onde [Termes descripteurs IGN] Nevada (Etats-Unis) [Termes descripteurs IGN] prospection minérale [Termes descripteurs IGN] quartz [Termes descripteurs IGN] Short Waves InfraRed Résumé : (auteur) The Wavelength Mapper is an algorithm that searches for the deepest absorption feature in each pixel of a hyperspectral image. On a per pixel basis, it extracts the wavelength position, which serves as a proxy of the mineralogy and the feature depth as a proxy for the relative abundance. This algorithm has been used with near and shortwave infrared data, but has not yet been tested on hyperspectral thermal infrared images. It is unclear what results are expected when the Wavelength Mapper algorithm is applied to hyperspectral thermal infrared data since reststrahlen features characteristically overlap in emissivity spectra. In this paper, the Wavelength Mapper is tested on a multi-flightline airborne hyperspectral TIR dataset acquired over the Yerington Batholith, Nevada. Observations were made in the 8.05–11.65 μm wavelength range to include thermal spectral features of major rock-forming minerals, and a new color ramp is created to separate quartz-rich rocks from plagioclase-rich rocks. Our results indicate that the Wavelength Mapper creates coherent spatial patterns across flightlines. The results displayed represent different types of igneous and sedimentary rocks, as well as the products of hydrothermal alteration via different colors, mainly based on the relative abundance of quartz, feldspar and garnet, as well as mica and epidote. Comparison with published maps indicate that the Wavelength Mapper represents for each pixel a parameter value that can be linked to the spectrally dominate rock-forming mineral of that area, as mapped with traditional fieldwork methods. In conclusion, the Wavelength Mapper can be applied to airborne hyperspectral TIR data to achieve a simple, repeatable, per-pixel overview map of the dominating rock-forming mineral occurrences. Numéro de notice : A2019-467 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.jag.2019.02.013 date de publication en ligne : 20/03/2019 En ligne : https://doi.org/10.1016/j.jag.2019.02.013 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93603 [article]

The cause of the 2011 Hawthorne (Nevada) earthquake swarm constrained by seismic and InSAR methods / Xianjie Zha in Journal of geodesy, vol 93 n°6 (June 2019)  

Public [article]  inJournal of geodesy > vol 93 n°6 (June 2019) . - pp 899 - 909 Titre : The cause of the 2011 Hawthorne (Nevada) earthquake swarm constrained by seismic and InSAR methods Type de document : Article/Communication Auteurs : Xianjie Zha, Auteur ; Zhe Jia, Auteur ; Zhiyang Dai, Auteur ; et al., Auteur Année de publication : 2019 Article en page(s) : pp 899 - 909 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] déformation de la croute terrestre [Termes descripteurs IGN] données polarimétriques [Termes descripteurs IGN] épicentre [Termes descripteurs IGN] image radar moirée [Termes descripteurs IGN] modèle de déformation tectonique [Termes descripteurs IGN] Nevada (Etats-Unis) [Termes descripteurs IGN] onde sismique [Termes descripteurs IGN] problème inverse [Termes descripteurs IGN] séisme Résumé : (auteur) We used both seismic and InSAR data to investigate the mechanism behind the 2011 Hawthorne (Nevada) earthquake swarm that occurred between March 15 and August 17, 2011. Regional seismic data were used to estimate the centroid depth and focal mechanism for nine earthquakes that occurred in this swarm, with magnitudes between Mw3.9 and Mw4.8. The inferred focal mechanisms indicate that the source of these earthquakes is normal faulting with a small left-lateral strike-slip component along the southwest direction. Three InSAR displacement maps covering the epicentral zone of the 2011 Hawthorne earthquakes were inverted to get a slip model. The slip distribution shows that the deformation source is characterized by normal faulting, consistent with our inferred focal mechanisms. Our results suggest that the seismogenic zone was in the tensile stress environment. The temporal and spatial evolutions of seismicity suggest that the 2011 Hawthorne swarm might be caused by aseismic slip. Therefore, the 2011 Hawthorne earthquake swarm may have been the result of aseismic slip under the regional tectonic stress, and had nothing to do with volcanic activity. However, the quantitative evidence for aseismic slip is limited to the indication that the geodetic moment is 15% greater than the seismic moment, which is near the level of uncertainty. Numéro de notice : A2019-353 Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-018-1212-5 date de publication en ligne : 02/11/2018 En ligne : https://doi.org/10.1007/s00190-018-1212-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93401 [article]

Assessing the relationship between ground measurements and object-based image analysis of land cover classes in Pinyon and Juniper Woodlands / April Hulet in Photogrammetric Engineering & Remote Sensing, PERS, vol 79 n° 9 (September 2013)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 79 n° 9 (September 2013) . - pp 799 - 808 Titre : Assessing the relationship between ground measurements and object-based image analysis of land cover classes in Pinyon and Juniper Woodlands Type de document : Article/Communication Auteurs : April Hulet, Auteur ; Bruce A. Roundy, Auteur ; Steven L. Petersen, Auteur ; et al., Auteur Année de publication : 2013 Article en page(s) : pp 799 - 808 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] analyse comparative [Termes descripteurs IGN] analyse d'image numérique [Termes descripteurs IGN] arbre (flore) [Termes descripteurs IGN] Californie (Etats-Unis) [Termes descripteurs IGN] carte de la végétation [Termes descripteurs IGN] classification dirigée [Termes descripteurs IGN] données de terrain [Termes descripteurs IGN] image infrarouge [Termes descripteurs IGN] Nevada (Etats-Unis) [Termes descripteurs IGN] occupation du sol [Termes descripteurs IGN] Oregon (Etats-Unis) [Termes descripteurs IGN] Pinus (genre) [Termes descripteurs IGN] plantation forestière [Termes descripteurs IGN] Utah (Etas-Unis) Résumé : (Auteur) Land managers need to rapidly assess vegetation composition and bare ground to effectively evaluate and manage shrub steppe communities that have been encroached by pinyon and juniper trees. We used an object-based image analysis (obia) approach to estimate land cover classes found in pinyon-juniper woodlands, and evaluated the relationship between ground measurements and OBIA land cover measurements. We acquired high-spatial resolution color-infrared imagery for five sites with a Vexcel UltraCamX digital camera in June 2009. We simultaneously collected ground-based cover measurements within 30 m x 33 m subplots. OBIA mean land cover class differences by site ranged from underestimating litter by 3 percent to overestimating live trees by 1 percent when compared to ground-based measurements. Overall accuracy for thematic maps was 84 percent with a Kappa statistic of 0.80. Although OBIA cover estimates varied slightly from ground cover estimates, methods provide land managers with options for prioritizing management practices and enabling monitoring at an operational scale. Numéro de notice : A2013-505 Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.79.9.799 En ligne : https://doi.org/10.14358/PERS.79.9.799 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32643 [article]

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Automatic conflation of digital gazetteer data / J.T. Hastings in International journal of geographical information science IJGIS, vol 22 n° 10 (october 2008)

Public [article]  inInternational journal of geographical information science IJGIS > vol 22 n° 10 (october 2008) . - pp 1109 - 1127 Titre : Automatic conflation of digital gazetteer data Type de document : Article/Communication Auteurs : J.T. Hastings, Auteur Année de publication : 2008 Article en page(s) : pp 1109 - 1127 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique [Termes descripteurs IGN] Californie (Etats-Unis) [Termes descripteurs IGN] cognition [Termes descripteurs IGN] conflation [Termes descripteurs IGN] métrique [Termes descripteurs IGN] Nevada (Etats-Unis) [Termes descripteurs IGN] répertoire toponymique [Termes descripteurs IGN] système de gestion de connaissances [Termes descripteurs IGN] toponyme Résumé : (Auteur) A digital gazetteer (DG) is a spatial dictionary of named and typed places in some environment, typically the near-surface of the Earth. DGs are proliferating in number and sophistication with the popularity of location-based services such as GoogleEarth, MapQuest, and OnStar. The essential utility of a DG is to translate between formal and informal systems of place referencing, i.e. between the ad hoc names and qualitative type classifications assigned to places, on the one hand, and quantitative locations for them, on the other. Frequently, it is necessary to consult and combine results from multiple sources of gazetteer data, which is tedious for humans and currently not done by machines. Thus, a fundamental challenge with DGs is conflation: merging gazetteer data so that place identity is preserved. The challenge can be met using a computational approach modelled on human behaviour, focusing first on places' geometries (since disjoint places cannot be the same), second on their type categories, and finally on their names. This article details a troika of metrics that mimic the human cognitive process, together with operational procedures for automated conflation of DG data using them. By way of demonstration, both abstract and practical results of conflation for the Lake Tahoe Basin of California and Nevada are presented. Copyright Taylor & Francis Numéro de notice : A2008-356 Thématique : GEOMATIQUE Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29349 [article]

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Landsat cross-calibration based on near simultaneous imaging of common targets / P.M. Teillet in Remote sensing of environment, vol 102 n° 3-4 (15 June2006)

Public [article]  inRemote sensing of environment > vol 102 n° 3-4 (15 June2006) . - pp 264 - 270 Titre : Landsat cross-calibration based on near simultaneous imaging of common targets Type de document : Article/Communication Auteurs : P.M. Teillet, Auteur ; B.L. Markham, Auteur ; R.R. Irish, Auteur Année de publication : 2006 Article en page(s) : pp 264 - 270 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes descripteurs IGN] analyse comparative [Termes descripteurs IGN] bande spectrale [Termes descripteurs IGN] étalonnage de capteur (imagerie) [Termes descripteurs IGN] étalonnage radiométrique [Termes descripteurs IGN] flore locale [Termes descripteurs IGN] image Landsat-ETM+ [Termes descripteurs IGN] image Landsat-TM [Termes descripteurs IGN] Nevada (Etats-Unis) Résumé : (Auteur) The paper presents the results of an extended analysis of image data sets acquired during the tandem-orbit configuration in 1999 for the purposes of radiometric cross-calibration of the Landsat-7 Enhanced Thematic Mapper Plus (ETM+) and Landsat-5 Thematic Mapper (TM) sensors. Earlier work focused on the tandem pair for the Railroad Valley Playa, Nevada (RVPN) site to tie down the Landsat-5 TM calibration based on the more accurate Landsat-7 ETM+ calibration. This paper describes new results based on as many as eight tandem image pairs. The additional tandem images are of primarily vegetated areas for which little or no ground reference data were available. Increasing the number of tandem pairs yielded results for the Landsat 5 TM gain coefficients within approximately +1% of the RVPN-based results in spectral bands 1, 2, 3 and 7, and within -2% and -4% of the RVPN-based results for spectral bands 4 and 5, respectively. Copyright Elsevier Numéro de notice : A2006-249 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27976 [article]

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A uniform sky illumination model to enhance shading of terrain and urban areas / Patrick Kennelly in Cartography and Geographic Information Science, vol 33 n° 1 (January 2006)  

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Automated update of an irrigated lands GIS using Spot HRV imagery / D.W. Eckhardt in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 11 (november 1990)

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Mineral mapping at Cuprite, Nevada with a 63-channel imaging spectrometer / F.A. Kruse in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 1 (january 1990)

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Extraction of fluvial networks from Spot panchromatic data in low relief, arid basin / T.W. Gardner in International Journal of Remote Sensing IJRS, vol 10 n° 11 (November 1989)

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Photogrammetric methods applied to surface effects mapping and volumetric studies at the Nevada test site, Nevada / M.N. Garcia in Photogrammetric Engineering & Remote Sensing, PERS, vol 55 n° 8 (august 1989)

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Diurnal radiance and shadow fluctuations in a cold desert shrub plant community / P.T. Tueller in Remote sensing of environment, vol 29 n° 1 (July 1989)

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Regional analysis of tertiary volcanic calderas (western US) using Landsat Thematic Mapper imagery / D.M. Spatz in Remote sensing of environment, vol 28 n° 1 (April - June 1989)

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Rangeland vegetation changes measured from helicopter-borne 35mm aerial photography / P.T. Tueller in Photogrammetric Engineering & Remote Sensing, PERS, vol 54 n° 5 (may 1988)

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Structural geology and regional tectonics of the mineral county area, Nevada, using Shuttle-Imaging-Radar-B and digital aeromagnetic data / M.X. Borengasser in International Journal of Remote Sensing IJRS, vol 9 n° 5 (May 1988)

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Comparison of techniques for discriminating hydrothermal alteration minerals with airborne imaging spectrometer data / S.C. Feldman in Remote sensing of environment, vol 24 n° 1 (February 1988)

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