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Relevance of airborne lidar and multispectral image data for urban scene classification using random forests / Li Guo in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 1 (January - February 2011)
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Titre : Relevance of airborne lidar and multispectral image data for urban scene classification using random forests Type de document : Article/Communication Auteurs : Li Guo, Auteur ; Nesrine Chehata , Auteur ; Clément Mallet
, Auteur ; Samia Boukir, Auteur
Année de publication : 2011 Article en page(s) : pp 56 - 66 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] analyse discriminante
[Termes IGN] classification dirigée
[Termes IGN] classification par forêts d'arbres décisionnels
[Termes IGN] données lidar
[Termes IGN] écho multiple
[Termes IGN] forme d'onde pleine
[Termes IGN] image multibande
[Termes IGN] semis de points
[Termes IGN] zone urbaine denseRésumé : (Auteur) Airborne lidar systems have become a source for the acquisition of elevation data. They provide georeferenced, irregularly distributed 3D point clouds of high altimetric accuracy. Moreover, these systems can provide for a single laser pulse, multiple returns or echoes, which correspond to different illuminated objects. In addition to multi-echo laser scanners, full-waveform systems are able to record 1D signals representing a train of echoes caused by reflections at different targets. These systems provide more information about the structure and the physical characteristics of the targets. Many approaches have been developed, for urban mapping, based on aerial lidar solely or combined with multispectral image data. However, they have not assessed the importance of input features. In this paper, we focus on a multi-source framework using aerial lidar (multi-echo and full waveform) and aerial multispectral image data. We aim to study the feature relevance for dense urban scenes. The Random Forests algorithm is chosen as a classifier: it runs efficiently on large datasets, and provides measures of feature importance for each class. The margin theory is used as a confidence measure of the classifier, and to confirm the relevance of input features for urban classification. The quantitative results confirm the importance of the joint use of optical multispectral and lidar data. Moreover, the relevance of full-waveform lidar features is demonstrated for building and vegetation area discrimination. Numéro de notice : A2011-016 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2010.08.007 Date de publication en ligne : 22/09/2010 En ligne : https://doi.org/10.1016/j.isprsjprs.2010.08.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30798
in ISPRS Journal of photogrammetry and remote sensing > vol 66 n° 1 (January - February 2011) . - pp 56 - 66[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2011011 SL Revue Centre de documentation Revues en salle Disponible
Titre : Navigation Signal Processing for GNSS Software Receivers Type de document : Monographie Auteurs : T. Pany, Auteur Editeur : Londres, Washington : Artech House Année de publication : 2010 Collection : GNSS Technology and applications series Importance : 352 p. Format : 18 x 26 cm ISBN/ISSN/EAN : 978-1-60807-027-5 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse discriminante
[Termes IGN] corrélation
[Termes IGN] détection du signal
[Termes IGN] estimation statistique
[Termes IGN] filtrage du bruit
[Termes IGN] Global Navigation Satellite System
[Termes IGN] logiciel de post-traitement GPS
[Termes IGN] positionnement cinématique en temps réel
[Termes IGN] prétraitement du signal
[Termes IGN] pseudolite
[Termes IGN] récepteur GNSS
[Termes IGN] récepteur GPS
[Termes IGN] traitement du signal
[Termes IGN] transformation rapide de FourierIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Editeur) The advancement of software radio technology has provided an opportunity for the design of performance-enhanced GNSS receivers that are more flexible and easier to develop than their FPGA or ASIC based counterparts. Filling a gap in the current literature on the subject, this highly practical resource offers you an in-depth understanding of navigation signal detection and estimation algorithms and their implementation in a software radio. This unique book focuses on high precision applications for GNSS signals and an innovative RTK receiver concept based on difference correlators. You learn how to develop navigation receivers for top performance using basic algorithms, like correlation and tracking, which can be understood on an intuitive level. Additionally, the book provides you with a theoretical framework for signal estimation and detection that gives you the knowledge you need to make performance assessments without building a receiver. The theoretical treatment also gives you hints for choosing optimal algorithms for your projects in the field. Note de contenu : Introduction.
Radio Navigation Signals.
Software-Defined Radio.
GNSS Receiver Structure and Dataflow.
Signal Estimation.
Signal Detection.
Sample Preprocessing.
Correlators.
Discriminators.
Receiver Core Operations.
GNSS SDR RTK System Concept.Numéro de notice : 20457 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63024 Leaf morphological analyses in four European oak species (Quercus) and their hybrids: A comparison of traditional and geometric morphometric methods / Vicenzo Viscosi in Plant Biosystems, vol 143 n° 3 (November 2009)
[article]
Titre : Leaf morphological analyses in four European oak species (Quercus) and their hybrids: A comparison of traditional and geometric morphometric methods Type de document : Article/Communication Auteurs : Vicenzo Viscosi, Auteur ; O. Lepais, Auteur ; Sophie Gerber, Auteur ; P. Fortini, Auteur Année de publication : 2009 Article en page(s) : pp 564 - 574 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] analyse discriminante
[Termes IGN] feuille (végétation)
[Termes IGN] morphologie mathématique
[Termes IGN] Quercus pedunculata
[Termes IGN] Quercus pubescens
[Termes IGN] Quercus pyrenaica
[Termes IGN] Quercus sessilifloraRésumé : (auteur) In this study, leaf morphology was assessed in a mixed oak stand (western France) using two geometric morphometric (landmark and outline) datasets and one dataset of 19 leaf measures. Adult oaks (817 oaks), comprising four white oak species ( Quercus petraea , Q. robur , Q. pubescens and Q. pyrenaica ), were sampled for DNA extraction and genetic analysis (nuclear microsatellites). Leaf morphology was assessed on 336 oaks, comprising pure species and hybrids as determined by genetic assignment. This comparative study of oak leaf morphology, based on the use of two free size geometric morphometric methods and a set of leaf measurements, combined with the genetic assignment of individuals to pure species or hybrids, provided information about the differences among species and the intermediate leaf morphology of their hybrids. Numéro de notice : A2009-048 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82175
in Plant Biosystems > vol 143 n° 3 (November 2009) . - pp 564 - 574[article]Colour-enhanced star plot glyphs : can salient shape characteristics be overcome? / Alexander Klippel in Cartographica, vol 44 n° 3 (September 2009)
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Titre : Colour-enhanced star plot glyphs : can salient shape characteristics be overcome? Type de document : Article/Communication Auteurs : Alexander Klippel, Auteur ; F. Hardisty, Auteur ; R. Li, Auteur ; C. Weaver, Auteur Année de publication : 2009 Article en page(s) : pp 217 - 232 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Rédaction cartographique
[Termes IGN] analyse discriminante
[Termes IGN] classification
[Termes IGN] couleur (rédaction cartographique)
[Termes IGN] lisibilité perceptive
[Termes IGN] variable visuelleRésumé : (Auteur) This article reports two experiments addressing the question of how the shape characteristics of star plot glyphs influence classification tasks and whether additional graphic features such as colour can be used to counterbalance the effects of shape characteristics. In a previous study we found that salient shapes of star plot glyphs, such as "has one spike," influence the classification of the data represented by the glyphs. The shape differences in star plot glyphs are induced by assigning variables to rays in different ways. The first two experiments showed shape influences; we then conducted two follow-up studies to shed more light on the influence of shape. First, to address the question of how the classification of star plot glyphs would be affected if they were stripped of their meaning, participants were asked to group star plot glyphs as shapes. The second study colour-coded the rays of star plot glyphs to focus attention on differences in salient shapes; for example, the general shape characteristic "has one spike" cannot be applied so easily if each spike is a different colour. The results show that colour-enhancing star plot glyphs improves processing speed and reduces the influence of salient shape characteristics. Copyright University of Toronto Press Numéro de notice : A2009-411 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.3138/carto.44.3.217 Date de publication en ligne : 02/10/2009 En ligne : https://doi.org/10.3138/carto.44.3.217 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30042
in Cartographica > vol 44 n° 3 (September 2009) . - pp 217 - 232[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 031-09031 RAB Revue Centre de documentation En réserve L003 Disponible Discrimination of agricultural crops in a tropical semi-arid region of Brazil based on L-band polarimetric airborne SAR data / W. Silva in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 5 (September - October 2009)
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Titre : Discrimination of agricultural crops in a tropical semi-arid region of Brazil based on L-band polarimetric airborne SAR data Type de document : Article/Communication Auteurs : W. Silva, Auteur ; B. Rudorff, Auteur ; A. Formaggio, Auteur ; W. Paradella, Auteur ; J. Mura, Auteur Année de publication : 2009 Article en page(s) : pp 458 - 463 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] Amérique tropicale
[Termes IGN] analyse discriminante
[Termes IGN] Bahia (Brésil)
[Termes IGN] bande L
[Termes IGN] classificateur
[Termes IGN] Coffea (genre)
[Termes IGN] cultures
[Termes IGN] Gossypium (genre)
[Termes IGN] image aérienne
[Termes IGN] image radar moirée
[Termes IGN] milieu tropical
[Termes IGN] polarimétrie radar
[Termes IGN] polarisation
[Termes IGN] prise en compte du contexte
[Termes IGN] rétrodiffusion
[Termes IGN] zone intertropicale
[Termes IGN] zone semi-arideRésumé : (Auteur) Recent articles are indicating that polarimetric data provide significantly more information than conventional or multi-polarized images, particularly due to the additional phase information. The objective of this paper is to evaluate the multi-polarized and fully polarimetric L-band airborne SAR-R99B data, in terms of their capability to distinguish among different agricultural crops in the western part of Bahia State, Brazil. Emphasis was given to coffee, cotton and pasture crops which were at well developed growing stages. Discrimination among crops was carried out using graphical analysis of mean backscatter values. Crop classification was performed for single and multiple polarizations, and fully polarimetric images with a classifier that uses the contextual Iterated Conditional Modes–ICM algorithm. The investigation confirmed the potential of L-band multi-polarized and polarimetric airborne SAR-R99B data to distinguish and classify agricultural crops in the tropical condition of the test-site. In addition, it clearly indicated the gradual and considerable improvement that was achieved going from single to three polarizations and from multi-polarized to fully polarimetric images. Copyright ISPRS Numéro de notice : A2009-398 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2008.07.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2008.07.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30029
in ISPRS Journal of photogrammetry and remote sensing > vol 64 n° 5 (September - October 2009) . - pp 458 - 463[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-09051 SL Revue Centre de documentation Revues en salle Disponible Application of spectral decomposition algorithm for mapping water quality in a turbid lake (Lake Kasumigaura, Japan) from Landsat TM data / Y. Oyama in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 1 (January - February 2009)
PermalinkModelling house unit density from land cover metrics: a Midwestern US example / P. Hardin in Geocarto international, vol 23 n° 5 (October - November 2008)
PermalinkSpecies identification of individual trees by combining high resolution LiDAR data with multi-spectral images / Johan Holmgren in International Journal of Remote Sensing IJRS, vol 29 n° 5 (March 2008)
PermalinkUn processus de sélection du réseau hydrographique, base sur la détection de structures / Guillaume Touya in Le monde des cartes, n° 194 (décembre 2007)
PermalinkVariability of fire-induced changes in MODIS surface reflectance by land-cover type in Borneo / Jukka Miettinen in International Journal of Remote Sensing IJRS, vol 28 n° 21-22 (November 2007)
PermalinkDetection and discrimination between oil spills and look-alike phenomena through neural networks / Konstantinos Topouzelis in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 4 (September 2007)
PermalinkHigher order vagueness in geographical information: empirical geographical population of type N fuzzy sets / P. Fischer in Geoinformatica, vol 11 n° 3 (September - November 2007)
PermalinkMetric details of topological line-line relations / K.A. Nedas in International journal of geographical information science IJGIS, vol 21 n° 1-2 (january 2007)
PermalinkSélection adaptative des dimensions de l'indexation visuelle d'images mal annotées en fonction du mot recherché / S. Tollari in Ingénierie des systèmes d'information, ISI : Revue des sciences et technologies de l'information, RSTI, vol 11 n° 4 (juillet - août 2006)
PermalinkEvaluation of the potential of SAR ERS and ASAR Envisat sensors in multi-incidence and multi-polarisation modes for landscape study in French Guyana: examples of Kourou and Saint Laurent du Maroni / J.L. Kouame in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)
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