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Use of hyperspectral derivative ratios in the red-edge region to identify plant stress responses to gas leaks / K.L. Smith in Remote sensing of environment, vol 92 n° 2 (15/08/2004)

Public [article]  inRemote sensing of environment > vol 92 n° 2 (15/08/2004) . - pp 207 - 217 Titre : Use of hyperspectral derivative ratios in the red-edge region to identify plant stress responses to gas leaks Type de document : Article/Communication Auteurs : K.L. Smith, Auteur ; M.D. Steven, Auteur ; J.J. Colls, Auteur Année de publication : 2004 Article en page(s) : pp 207 - 217 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] bande visible [Termes descripteurs IGN] blé (céréale) [Termes descripteurs IGN] canalisation [Termes descripteurs IGN] feuille (végétation) [Termes descripteurs IGN] gaz [Termes descripteurs IGN] herbe [Termes descripteurs IGN] image hyperspectrale [Termes descripteurs IGN] oxygène (O²) [Termes descripteurs IGN] pollution [Termes descripteurs IGN] rayonnement proche infrarouge [Termes descripteurs IGN] réflectance végétale [Termes descripteurs IGN] végétation Résumé : (Auteur) Hyperspectral features in the red-edge region were tested as an index of plant stress responses to soil -oxygen depletion. The aim was to provide the basis for a warning system to identify natural gas leakage by the spectral responses of plants growing in the affected soil. Elevated concentrations of natural gas in the soil atmosphere were used to deplete oxygen concentrations around the roots of grass, wheat (Hordeum vulgare cv Claire) and bean (Vicia faba cv Clipper) growing in a field facility. Visible symptoms due to the natural gas included reduced growth of the plants and chlorosis of the leaves. Spectral responses included increased reflectance in the visible wavelengths and decreased reflectance in the near infra-red. Derivative analysis identified features within the red-edge at 720-730 and 702 nm. Ratios of the magnitude of the derivative at 725 to that at 702 nm were less in areas where gas was present. This ratio enabled identification of stress due to gas leakage up to 7 days before visible symptoms were observed and also at the edges of gassed plots where visible symptoms were not expressed. The technique was able to identify stress responses to long-term leaks in all the crops tested but to short-term leaks only in grass. This study therefore suggests that under appropriate conditions remote sensing could be used to detect pipeline gas leaks from decreases in the ratio of peaks within the red-edge. Numéro de notice : A2004-334 Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26861 [article]

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Intercalibration of vegetation indices from different sensor systems / M.D. Steven in Remote sensing of environment, vol 88 n° 4 (30/12/2003)

Public [article]  inRemote sensing of environment > vol 88 n° 4 (30/12/2003) . - pp 412 - 422 Titre : Intercalibration of vegetation indices from different sensor systems Type de document : Article/Communication Auteurs : M.D. Steven, Auteur ; T.J. Malthus, Auteur ; F. Baret, Auteur ; H. Xu, Auteur ; M. Chopping, Auteur Année de publication : 2003 Article en page(s) : pp 412 - 422 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes descripteurs IGN] données multicapteurs [Termes descripteurs IGN] indice de végétation [Termes descripteurs IGN] luminance lumineuse [Termes descripteurs IGN] réflectance végétale [Termes descripteurs IGN] simulation d'étalonnage Résumé : (Auteur) Spectroradiometric measurements were made over a range of crop canopy densities, soil backgrounds and foliage colour. The reflected spectral radiances were convoluted with the spectral response functions of a range of satellite instruments to simulate their responses. When Normalised Difference Vegetation Indices (NDVI) from the different instruments were compared, they varied by a few percent, but the values were strongly linearly related, allowing vegetation indices from one instrument to be intercalibrated against another. A table of conversion coefficents is presented for AVHRR, ATSR2, Landsat MSS, TM and ETM+, SPOT-2 and SPOT-4 HRV, IRS, IKONOS, SEAWIFS, MISR, MODIS, POLDER, Quickbird and MERIS (see Appendix A for glossary of acronyms). The same set of coefficients was found to apply, within the margin of error of the analysis, for the Soil Adjusted Vegetation Index SAVI. The relationships for SPOT vs. TM and for ATSR-2 vs. AVHRR were directly validated by comparison of atmospherically corrected image data. The results indicate that vegetation indices can be interconverted to a precision of 12%. This result offers improved opportunities for monitoring crops through the growing season and the prospects of better continuity of long-term monitoring of vegetation responses to environmental change. Numéro de notice : A2003-367 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26447 [article]

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Applications of remote sensing in agriculture / M.D. Steven (1990)

Public Titre : Applications of remote sensing in agriculture : Proceedings of the 48th Easter school in agricultural science, Nottingham, 3rd-7th April 1989 Type de document : Actes de congrès Auteurs : M.D. Steven, Editeur scientifique ; J.A. Clark, Editeur scientifique Congrès : Congrès: 48th Easter school in agricultural science Applications of remote sensing in agriculture (3 - 7 avril 1989; Nottingham, Royaume-Uni), Auteur Editeur : Londres : Butterworths Année de publication : 1990 Importance : 427 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-0-408-04767-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] agriculture [Termes descripteurs IGN] Grande-Bretagne [Termes descripteurs IGN] télédétection spatiale Numéro de notice : 30009 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=35069

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Ground truth : an underview / M.D. Steven in International Journal of Remote Sensing IJRS, vol 8 n° 7 (July 1987)

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 8 n° 7 (July 1987) . - pp 1033 - 1038 Titre : Ground truth : an underview Type de document : Article/Communication Auteurs : M.D. Steven, Auteur Année de publication : 1987 Article en page(s) : pp 1033 - 1038 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes descripteurs IGN] couvert végétal [Termes descripteurs IGN] information géographique [Termes descripteurs IGN] réalité de terrain [Termes descripteurs IGN] signature spectrale [Termes descripteurs IGN] travaux de terrain Numéro de notice : A1987-225 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24315 [article]

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Atmospheric corrections for remote sensing / E.M. Rollin (1985)

Public Titre : Atmospheric corrections for remote sensing : Proceedings of a remote sensing workshop, organised by University of Nottingham remote sensing group for the Remote sensing society, at the department of Geography, University of Nottingham, England, 22 May 1985 Type de document : Actes de congrès Auteurs : E.M. Rollin, Editeur scientifique ; M.D. Steven, Editeur scientifique ; Paul M. Mather, Editeur scientifique Congrès : Congrès: RSS 1985, remote sensing workshop Atmospheric corrections for remote sensing (22 mai 1985; University of Nottingham, Nottingham, Royaume-Uni), Auteur Editeur : Nottingham : University of Nottingham Année de publication : 1985 Importance : 192 p. Format : 15 x 21 cm ISBN/ISSN/EAN : 978-0-85358-026-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes descripteurs IGN] Advanced Very High Resolution Radiometer [Termes descripteurs IGN] bruit atmosphérique [Termes descripteurs IGN] correction atmosphérique [Termes descripteurs IGN] image aérienne [Termes descripteurs IGN] image Météosat [Termes descripteurs IGN] propagation ionosphérique [Termes descripteurs IGN] propagation troposphérique [Termes descripteurs IGN] radar à antenne synthétique [Termes descripteurs IGN] rayonnement infrarouge thermique [Termes descripteurs IGN] réfraction atmosphérique Résumé : (Auteur) The problems deriving from atmospheric distortions of electromagnetic signals cause widespread anxiety in the remote sensing community and their consequences are anticipated but not thoroughly understood. Meanwhile, there are few amongst those who apply remote sensing techniques in their particular branches of science and consulting equipped to research the worrying implications of such distortions. The convening of this workshop focussing on the subject was particularly welcome therefore, as it enabled the small but very important group of concerned specialists in the United Kingdom to come together to discuss their problems and explain how they have approached them. The sessions also allowed time for participants to show how they had derived correction factors which they have found useful and the papers published here reflect the type of work being undertaken in the fields of land, oceanographic and atmospheric applications. By far the most important feature of the meeting, however, was the opportunity which it provided for members of the remote sensing community concerned with applications to have their ideas reviewed by scientists engaged in research and development with a view to the development of new sensors. It is hoped that the points raised in discussion will in due course find their way into the literature. Note de contenu : Foreword J.A. ALLAN Introduction P.M. MATHER Estimation of atmospheric corrections from multiple aircraft imagery M. D. STEVEN and E.M. ROLLIN Atmospheric corrections to the Meteosat thermal infrared data during the wet season over the Sahel G. DUGDALE, J.R. MILFORD and V.D. McDOUGALL Ionospheric and tropospheric effects on Synthetic Aperture Radar performance S. QUEGAN and J. LAMONT Satellite remote sensing of atmospheric optical depth spectrum S. ARANUVACHAPUN Evaluation of atmospheric effects for SPOT stereoscopic modelling using AVHRR data S.H. SINGH Refraction and propagation delays A.H. DODSON Removal of atmospheric effects in thermal infrared wavebands R.D. CALLISON Atmospheric correction using a ground-based spectroradiometer H.T.C. VAN STOKKOM and L.M.M. VEUGEN Numéro de notice : 16659 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34819

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