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Total canopy transmittance estimated from small-footprint, full-waveform airborne LiDAR / Milutin Milenković in ISPRS Journal of photogrammetry and remote sensing, vol 128 (June 2017)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 128 (June 2017) . - pp 61 - 72 Titre : Total canopy transmittance estimated from small-footprint, full-waveform airborne LiDAR Type de document : Article/Communication Auteurs : Milutin Milenković, Auteur ; Wolfgang Wagner, Auteur ; Raphael Quast, Auteur ; et al., Auteur Année de publication : 2017 Article en page(s) : pp 61 - 72 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] arbre caducifolié [Termes IGN] canopée [Termes IGN] classification dirigée [Termes IGN] couvert végétal [Termes IGN] données lidar [Termes IGN] feuillu [Termes IGN] forêt [Termes IGN] forme d'onde pleine [Termes IGN] Pinophyta [Termes IGN] réflectance végétale [Termes IGN] semis de points [Termes IGN] transmittance Résumé : (Auteur) Canopy transmittance is a directional and wavelength-specific physical parameter that quantifies the amount of radiation attenuated when passing through a vegetation layer. The parameter has been estimated from LiDAR data in many different ways over the years. While early LiDAR methods treated each returned echo equally or weighted the echoes according to their return order, recent methods have focused more on the echo energy. In this study, we suggest a new method of estimating the total canopy transmittance considering only the energy of ground echoes. Therefore, this method does not require assumptions for the reflectance or absorption behavior of vegetation. As the oblique looking geometry of LiDAR is explicitly considered, canopy transmittance can be derived for individual laser beams and can be mapped spatially. The method was applied on a contemporary full-waveform LiDAR data set collected under leaf-off conditions and over a study site that contains two sub regions: one with a mixed (coniferous and deciduous) forest and another that is predominantly a deciduous forest in an alluvial plain. The resulting canopy transmittance map was analyzed for both sub regions and compared to aerial photos and the well-known fractional cover method. A visual comparison with aerial photos showed that even single trees and small canopy openings are visible in the canopy transmittance map. In comparison with the fractional cover method, the canopy transmittance map showed no saturation, i.e., there was better separability between patches with different vegetation structure. Numéro de notice : A2017-331 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2017.03.008 En ligne : https://doi.org/10.1016/j.isprsjprs.2017.03.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85484 [article]

Exemplaires(3)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2017061	RAB	Revue	Centre de documentation	En réserve L003	Disponible
081-2017063	DEP-EXM	Revue	LASTIG	Dépôt en unité	Exclu du prêt
081-2017062	DEP-EAF	Revue	Nancy	Dépôt en unité	Exclu du prêt

Reducing the dimensionality of plant spectral databases / I.E. Bell in IEEE Transactions on geoscience and remote sensing, vol 42 n° 3 (March 2004)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 42 n° 3 (March 2004) . - pp 570 - 576 Titre : Reducing the dimensionality of plant spectral databases Type de document : Article/Communication Auteurs : I.E. Bell, Auteur ; V.G. Baranoski, Auteur Année de publication : 2004 Article en page(s) : pp 570 - 576 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse en composantes principales [Termes IGN] base de données [Termes IGN] biologie [Termes IGN] réflectance végétale [Termes IGN] transmittance [Termes IGN] végétation Résumé : (Auteur) Ground-based measurements of plant reflectance and transmittance are essential for remote sensing projects oriented toward agriculture, forestry, and ecology. This paper examines the application of principal components analysis (PCA) in the storage and reconstruction of such plant spectral data. A novel piecewise PCA approach (PPCA), which takes into account the biological factors that affect the interaction of solar radiation with plants, is also proposed. These techniques are compared through experiments involving the reconstruction of reflectance and transmittance curves for herbaceous and woody specimens. The spectral data used in these experiments were obtained from the Leaf Optical Properties Experiment (LOPEX) database. The reconstructions were performed aiming at a root-mean-square error (RMSE) lower than 1%. The results of these experiments indicate that PCA can effectively reduce the dimensionality of plant spectral databases from the visible to the infrared regions of the light spectrum, and that the PPCA approach can further maximize the accuracy/cost ratio of the storage and reconstruction of plant spectral reflectance and transmittance data. Numéro de notice : A2004-155 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.821697 En ligne : https://doi.org/10.1109/TGRS.2003.821697 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26682 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-04031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Determination of surface reflectance and estimates of atmospheric optical depth and single scattering albedo from Landsat Thematic Mapper data / J.E. Conel in International Journal of Remote Sensing IJRS, vol 11 n° 5 (May 1990)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 11 n° 5 (May 1990) . - pp 783 - 828 Titre : Determination of surface reflectance and estimates of atmospheric optical depth and single scattering albedo from Landsat Thematic Mapper data Type de document : Article/Communication Auteurs : J.E. Conel, Auteur Année de publication : 1990 Article en page(s) : pp 783 - 828 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] albedo [Termes IGN] diffusion du rayonnement [Termes IGN] image Landsat-TM [Termes IGN] modèle atmosphérique [Termes IGN] propagation ionosphérique [Termes IGN] propagation troposphérique [Termes IGN] radiance [Termes IGN] réflectance [Termes IGN] simulation [Termes IGN] spectromètre [Termes IGN] traitement d'image [Termes IGN] transmittance [Termes IGN] Wyoming (Etats-Unis) Résumé : (Auteur) Ground reflectance data of selected targets for calibration of a Landsat Thematic Mapper (TM) image of Wind River Basin, Wyoming, acquired November 21, 1982, were analysed. The calibration lines, one for each band, are derived from linear regression analysis of scatter plots of ground bidirectional spectral reflectance versus the Thematic Mapper (TM) scanner response. The field-measured reflectances were obtained with a portable spectrometer at 10nm spectral resolution in November 1983. The empirical equations derived were used to predict the ground reflectance of five unknown targets scattered throughout the Wind River and adjacent Bighorn Basins. Subsequently, in July 1984, field measurements were made over these targets with field spectrometers and with a hand-held radiometer with filters matching those of the TM. The agreement between predicted and measured quantities, mostly within the uncertainties of the field observations, was obtained, suggesting that the ground reflectance properties of the areas studied were approximately the same in November 1982 and July 1984, and that, as suggested by visual inspection of the images themselves, the atmosphere during TM data acquisition was relatively homogeneous from place to place over the area of our field observations. In addition to determining ground reflectance, we also used these field-derived calibration relationships together with current radiometric calibration data for the TM in a simple homogeneous atmospheric model to estimate emergent radiance at the satellite. From the emergent radiance and the atmospheric model, we derived estimates, on a straightforward algebraic inversion scheme, of single scattering albedo (o>0) and optical depth (t) for the atmosphere. These relationships follow from the fact that the intercept value of a field calibration line, determined at zero surface reflectance, provides an estimate of the path radiance; the slope is a function of the two-way transmittance. To disentangle the atmospheric properties we assumed the atmosphere to be isotropically scattering. This is the only assumption that can be made considering the essentially single nadir-looking direction of TM surface observations. For this model the slope and intercept provide two functions of a>0 and t, whose numerical magnitudes together with the solar spectral irradiances are known. These equations were solved simultaneously, exactly in the single scattering approximation and iteratively with multiple scattering. Uncertainties in the derived quantities were estimated from the standard errors provided by the regression analysis. The results for optical depth variation with wavelength are 20 per cent greater than those predicted from the model of reference, a LOWTRAN 6 simulation of mid-latitude winter conditions. This led to consideration of sources of error in the analysis. All of these lead to overestimates of the optical depth, and include: (1) atmospheric scattering from the surroundings over the standard targets (adjacency effects), (2) contamination of surface targets by other components, e.g., ground by snow and snow by ground, vegetation, or shadows, and (3) the neglect of anisotropic scattering in the atmospheric model. Numéro de notice : A1990-089 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431169008955057 En ligne : https://doi.org/10.1080/01431169008955057 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25506 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-90051	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Radiation exchange / J.H. Taylor (1990)

Public Titre : Radiation exchange : an introduction Type de document : Guide/Manuel Auteurs : J.H. Taylor, Auteur Editeur : Londres, New York : Academic Press Année de publication : 1990 Importance : 126 p. Format : 16 x 23 cm ISBN/ISSN/EAN : 978-0-12-684560-0 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rayonnement électromagnétique [Termes IGN] corps noir [Termes IGN] emissivité [Termes IGN] énergie solaire [Termes IGN] étalonnage radiométrique [Termes IGN] glace [Termes IGN] radiomètre [Termes IGN] rayonnement électromagnétique [Termes IGN] transmittance Index. décimale : 24.30 Rayonnement électromagnétique Numéro de notice : 44506 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Manuel Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=47742

Bidirectional scattering of light from tree leaves / T.W. Brakke in Remote sensing of environment, vol 29 n° 2 (01/08/1989)  

Public [article]  inRemote sensing of environment > vol 29 n° 2 (01/08/1989) . - pp 175 - 183 Titre : Bidirectional scattering of light from tree leaves Type de document : Article/Communication Auteurs : T.W. Brakke, Auteur ; J.A. Smith, Auteur ; J.M. Harnden, Auteur Année de publication : 1989 Article en page(s) : pp 175 - 183 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] Acer (genre) [Termes IGN] diffusion du rayonnement [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] feuille (végétation) [Termes IGN] goniomètre [Termes IGN] Quercus (genre) [Termes IGN] rayonnement lumineux [Termes IGN] réflectance végétale [Termes IGN] transmittance Numéro de notice : A1989-363 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/0034-4257(89)90025-4 En ligne : https://doi.org/10.1016/0034-4257(89)90025-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25322 [article]

Leaf bidirectional reflectance and transmittance in corn and soybean / E.A.W. Shea in Remote sensing of environment, vol 29 n° 2 (01/08/1989)  

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Corrections atmosphériques / Robert Bariou (1986)

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Le rayonnement électro-magnétique / Robert Bariou (1985)

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Microwave radiometry and its potential application to Earth resources surveys : Report prepared for the European space research organisation under ESTEC contract 1411/71 EL, 1. Physical background and technological implementation / S. Axelsson (1971)

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