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Termes IGN > sciences naturelles > physique > optique > optique physique > radiométrie > spectroradiométrie > spectrophotométrie
spectrophotométrie |
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Mapping leaf chlorophyll content from Sentinel-2 and RapidEye data in spruce stands using the invertible forest reflectance model / Roshanak Darvishzadeh in International journal of applied Earth observation and geoinformation, vol 79 (July 2019)
[article]
Titre : Mapping leaf chlorophyll content from Sentinel-2 and RapidEye data in spruce stands using the invertible forest reflectance model Type de document : Article/Communication Auteurs : Roshanak Darvishzadeh, Auteur ; Andrew K. Skidmore, Auteur ; Haidi Abdullah, Auteur ; Elias Cherenet, Auteur Année de publication : 2019 Article en page(s) : pp 58-70 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse multibande
[Termes IGN] bande rouge
[Termes IGN] bande spectrale
[Termes IGN] Bavière (Allemagne)
[Termes IGN] canopée
[Termes IGN] carte de la végétation
[Termes IGN] image RapidEye
[Termes IGN] image Sentinel-MSI
[Termes IGN] modèle d'inversion
[Termes IGN] Picea abies
[Termes IGN] réflectance végétale
[Termes IGN] spectrophotométrie
[Termes IGN] teneur en chlorophylle des feuillesRésumé : (auteur) Leaf chlorophyll plays an essential role in controlling photosynthesis, physiological activities and forest health. In this study, the performance of Sentinel-2 and RapidEye satellite data and the Invertible Forest Reflectance Model (INFORM) radiative transfer model (RTM) for retrieving and mapping of leaf chlorophyll content in the Norway spruce (Picea abies) stands of a temperate forest was evaluated. Biochemical properties of leaf samples as well as stand structural characteristics were collected in two subsequent field campaigns during July 2015 and 2016 in the Bavarian Forest National Park (BFNP), Germany, parallel with the timing of the RapidEye and Sentinel-2 images. Leaf chlorophyll was measured both destructively and nondestructively using wet chemical spectrophotometry analysis and a hand-held chlorophyll content meter. The INFORM was utilised in the forward mode to generate two lookup tables (LUTs) in the spectral band settings of RapidEye and Sentinel-2 data using information obtained from the field campaigns. Before generating the LUTs, the sensitivity of the model input parameters to the spectral data from RapidEye and Sentinel-2 were examined. The canopy reflectance of the studied plots were obtained from the satellite images and used as input for the inversion of LUTs. The coefficient of determination (R2), root mean square errors (RMSE), and the normalised root mean square errors (NRMSE), between the retrieved and measured leaf chlorophyll, were then used to examine the attained results from RapidEye and Sentinel-2 data, respectively. The use of multiple solutions and spectral subsets for the inversion process were further investigated to enhance the retrieval accuracy of foliar chlorophyll. The result of the sensitivity analysis demonstrated that the simulated canopy reflectance of Sentinel-2 is sensitive to the alternation of all INFORM input parameters, while the simulated canopy reflectance from RapidEye did not show sensitivity to leaf water content variations. In general, there was agreement between the simulated and measured reflectance spectra from RapidEye and Sentinel-2, particularly in the visible and red-edge regions. However, examining the average absolute error from the simulated and measured reflectance revealed a large discrepancy in spectral bands around the near-infrared shoulder. The relationship between retrieved and measured leaf chlorophyll content from the Sentinel-2 data had a higher coefficient of determination with a higher NRMSE (NRMSE = 0.36 μg/cm2, R2 = 0.45) compared to those obtained using the RapidEye data (NRMSE = 0.31 μg/cm2 and R2 = 0.39). Using the mean of the ten best solutions (retrieved chlorophyll) the retrieval error for both Sentinel-2 and RapidEye data decreased (NRMSE = 0.34, NRMSE = 0.26, respectively), as compared to only selecting the single best solution. When the Sentinel-2 red edge bands were used as the spectral subset, the retrieval error of leaf chlorophyll decreased indicating the importance of red edge, as well as properly located spectral bands, for leaf chlorophyll estimation. The chlorophyll maps produced by the inversion of the two LUTs effectively represented the variation of foliar chlorophyll in BFNP and confirmed our earlier findings on the observed stress pattern caused by insect infestation. Our findings emphasise the importance of multispectral satellites which benefits from red edge spectral bands such as Sentinel-2 as well as RapidEye for regional mapping of vegetation foliar properties, particularly, chlorophyll using RTMs such as INFORM. Numéro de notice : A2019-460 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.jag.2019.03.003 Date de publication en ligne : 08/03/2019 En ligne : https://doi.org/10.1016/j.jag.2019.03.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93577
in International journal of applied Earth observation and geoinformation > vol 79 (July 2019) . - pp 58-70[article]Continuum removed band depth analysis for detecting the effects of natural gas, methane and ethane reflectance / M.F. Noomen in Remote sensing of environment, vol 105 n° 3 (15/12/2006)
[article]
Titre : Continuum removed band depth analysis for detecting the effects of natural gas, methane and ethane reflectance Type de document : Article/Communication Auteurs : M.F. Noomen, Auteur ; Andrew K. Skidmore, Auteur ; Freek Van Der Meer, Auteur ; Herbert H.T. Prins, Auteur Année de publication : 2006 Article en page(s) : pp 262 - 270 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] bande visible
[Termes IGN] gaz naturel
[Termes IGN] photosynthèse
[Termes IGN] réflectance végétale
[Termes IGN] santé
[Termes IGN] spectrophotométrie
[Termes IGN] végétationRésumé : (Auteur) It is known that natural gas in the soil affects vegetation health, which may be detected through analysis of reflectance spectra. Since natural gas is invisible, changes in the vegetation could potentially indicate gas leakage. Although it is known that gas in soil affects plant reflectance, the relationship between natural gas and the development and reflectance properties of plants has not been studied. The objective of this study was to test whether natural gas and its two main components, methane and ethane, affect vegetation reflectance in the chlorophyll and water absorption regions. An experiment was carried out in which maize (Zea mays) plants were grown in pots that were flushed with 10 l of gas per day for 39 + 4 days. Leaf reflectance was measured once a week with a spectrophotometer. The reflectance was analysed using continuum removal of the blue (400–550 nm), red (550–750 nm) and two water absorption features (1370–1570 nm and 1870–2170 nm), after which the band depths and normalized band depths were analyzed for each treatment. The band depth analysis showed that ethane caused an initial increase of 10% in reflectance between 560 and 590 nm, followed by a decrease during the course of the experiment. Normalized band depth analysis showed that ethane caused a reflectance shift of 1 to 5 nm towards longer wavelengths compared to the control reflectance in the visible region. All gases caused an increase in reflectance in the water absorption bands. The physiological reflectance index, PRI, which has previously linked water stress to photosynthetic activity, suggested that the hydrocarbon gases (particularly ethane) decreased the photosynthetic activity of the plants. The combination of reduced band depths in the chlorophyll and water absorption regions and the increased PRI suggests that ethane gas in the soil hampered a normal water uptake by maize plants in an early stage of their growth. Although further research is necessary to upscale the results from the laboratory to the field, the increased reflectance in the 560–590 nm region caused by ethane together with the increased PRI are promising indicators for gas leakage. Copyright Elsevier Numéro de notice : A2006-558 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.07.009 En ligne : https://doi.org/10.1016/j.rse.2006.07.009 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28281
in Remote sensing of environment > vol 105 n° 3 (15/12/2006) . - pp 262 - 270[article]The development and causes of range degradation features in southeast Botswana using multi-temporal Landsat MSS imagery / S. Ringrose in Photogrammetric Engineering & Remote Sensing, PERS, vol 56 n° 9 (september 1990)
[article]
Titre : The development and causes of range degradation features in southeast Botswana using multi-temporal Landsat MSS imagery Type de document : Article/Communication Auteurs : S. Ringrose, Auteur ; W. Mataheson, Auteur ; F. Tempest, Auteur ; T. Boyle, Auteur Année de publication : 1990 Article en page(s) : pp 1253 - 1262 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse diachronique
[Termes IGN] Botswana
[Termes IGN] dégradation de la flore
[Termes IGN] élevage
[Termes IGN] flore locale
[Termes IGN] image Landsat-MSS
[Termes IGN] image multibande
[Termes IGN] image multitemporelle
[Termes IGN] parcours
[Termes IGN] spectrophotométrieNuméro de notice : A1990-125 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.asprs.org/wp-content/uploads/pers/1990journal/sep/1990_sep_1253-1262 [...] Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25541
in Photogrammetric Engineering & Remote Sensing, PERS > vol 56 n° 9 (september 1990) . - pp 1253 - 1262[article]Télédétection des ressources terrestres / A. Bothorel (1983)
Titre : Télédétection des ressources terrestres : signatures spectrales (visible, proche I.R.) de roches et de minerais en zone aride ; application à trois types de minéralisations au Maroc Type de document : Thèse/HDR Auteurs : A. Bothorel, Auteur Editeur : Paris : Université de Paris 6 Pierre et Marie Curie Année de publication : 1983 Importance : 174 p. Format : 21 x 30 cm Note générale : Bibliographie
Thèse pour l'obtention du diplôme de docteur de 3e cycle, spécialité sciences naturelles, mention minéralogieLangues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] bande visible
[Termes IGN] géologie locale
[Termes IGN] Maroc
[Termes IGN] minerai
[Termes IGN] rayonnement proche infrarouge
[Termes IGN] réflectance
[Termes IGN] ressources minérales
[Termes IGN] roche
[Termes IGN] signature spectrale
[Termes IGN] spectrophotométrie
[Termes IGN] spectroradiométrie
[Termes IGN] zone arideIndex. décimale : THESE Thèses et HDR Numéro de notice : 23584 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse française Note de thèse : Thèse de docteur de 3e cycle : sciences naturelles. mention minéralogie : Paris 6 : 1983 Organisme de stage : Unité d'enseignement et de Recherche des Sciences de la Terre nature-HAL : Thèse DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45358 Encyclopédie photométrique / F. Blottiau (1951)
Titre : Encyclopédie photométrique : photométrie visuelle : colorimétrie Type de document : Monographie Auteurs : F. Blottiau, Auteur Editeur : Paris : Revue d'Optique Théorique et Instrumentale (Editions de la) Année de publication : 1951 Importance : 260 p. Format : 16 x 24 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Optique physiologique
[Termes IGN] chromatopsie
[Termes IGN] colorimétrie
[Termes IGN] éclairage
[Termes IGN] espace colorimétrique
[Termes IGN] spectrophotométrieNuméro de notice : 59589 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60606 Réservation
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