Descripteur
Documents disponibles dans cette catégorie (34)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
An empirical investigation of cross-sensor relationships of NDVI and red/near-infrared reflectance using EO-1 Hyperion data / T. Miura in Remote sensing of environment, vol 100 n° 2 (30 January 2006)
[article]
Titre : An empirical investigation of cross-sensor relationships of NDVI and red/near-infrared reflectance using EO-1 Hyperion data Type de document : Article/Communication Auteurs : T. Miura, Auteur ; A. Huete, Auteur ; Hiroki Yoshioka, Auteur Année de publication : 2006 Article en page(s) : pp 223 - 236 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse comparative
[Termes IGN] bande rouge
[Termes IGN] Brésil
[Termes IGN] étalonnage des données
[Termes IGN] filtre passe-bande
[Termes IGN] flore locale
[Termes IGN] forêt tropicale
[Termes IGN] image EO1-Hyperion
[Termes IGN] image hyperspectrale
[Termes IGN] image Landsat-ETM+
[Termes IGN] image Terra-MODIS
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] rayonnement proche infrarouge
[Termes IGN] réflectance spectrale
[Termes IGN] savaneRésumé : (Auteur) Long term observations of global vegetation from multiple satellites require much effort to ensure continuity and compatibility due to differences in sensor characteristics and product generation algorithms. In this study, we focused on the band-pass filter differences and empirically investigated cross-sensor relationships of the normalized difference vegetation index (NDVI) and reflectance. The specific objectives were: 1) to understand the systematic trends in cross-sensor relationships of the NDVI and reflectance as a function of spectral band-passes, 2) to examine/ identify the relative importance of the spectral features (i.e., the green peak, red edge, and leaf liquid water absorption regions) in and the mechanism(s) of causing the observed systematic trends, and 3) to evaluate the performance of several empirical cross-calibration methods in modelling the observed systematic trends. A Level 1A Hyperion hyperspectral image acquired over a tropical forest-savanna transitional region in Brazil was processed to simulate atmospherically corrected reflectances and NDVI for various band-passes, including Terra Moderate Resolution Imaging Spectro-radiometer (MODIS), NOAA-14 Advanced Very High Resolution Radiometer (AVHRR), and Landsat7 Enhanced Thematic Mapper Plus (ETM+). Data were extracted from various land cover types typically found in tropical forest and savanna biomes and used for analyses. Both NDVI and reflectance relationships among the sensors were neither linear nor unique and were found to exhibit complex patterns and band-pass dependencies. The reflectance relationships showed strong land cover dependencies. The NDVI relationships, in contrast, did not show land cover dependencies, but resulted in non-linear forms. From sensitivity analyses, the green peak (550 nm) and red-NIR transitional (680780 nm) features were identified as the key factors in producing the observed land cover dependencies and non-linearity in cross-sensor relationships. In particular, differences in the extents to which the red and/or NIR band-passes included these features significantly influenced the forms and degrees of non-linearity in the relationships. Translation of MODIS NDVI to "AVHRR Iike" NDVI using a weighted average of MODIS green and red bands performed very poorly, resulting in no reduction of overall discrepancy between MODIS and AVHRR NDVI. Cross-calibration of NDVI and reflectance using NDVI-based quadratic functions performed well, reducing their differences to +.025 units for the NDVI and +.01 units for the reflectances; however, many of the translation results suffered from bias errors. The present results suggest that distinct translation equations and coefficients need to be developed for every sensor pairs and that land cover-dependency need to be explicitly accounted for to reduce bias errors. Numéro de notice : A2006-034 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2005.10.010 En ligne : https://doi.org/10.1016/j.rse.2005.10.010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27761
in Remote sensing of environment > vol 100 n° 2 (30 January 2006) . - pp 223 - 236[article]Microstrip filters for RF/microwave applications / J.S. Hong (2001)
Titre : Microstrip filters for RF/microwave applications Type de document : Monographie Auteurs : J.S. Hong, Auteur ; M.J. Lancaster, Auteur Editeur : New York, Londres, Hoboken (New Jersey), ... : John Wiley & Sons Année de publication : 2001 Collection : Wiley Series in Microwave and Optical Engineering Importance : 471 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-0-471-38877-7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] filtre
[Termes IGN] filtre passe-bande
[Termes IGN] hyperfréquence
[Termes IGN] rayonnement radioélectriqueIndex. décimale : 24.20 Traitement du signal Résumé : (Editeur) Microstrip Filters for RF/Microwave Applications is the only professional reference focusing solely on microstrip filters. It offers a unique and comprehensive treatment of filters bases on the microstrip structure and includes full design methodologies that are also applicable to waveguide and other transmission line filters. The authors include coverage of new configurations with advanced filtering characteristics, new design techniques, and methods for filter miniaturization. The book utilizes numerous design examples to illustrate and emphasize computer analysis and synthesis while also discussing the applications of commercially available software. Other highlights include :
- Lowpass and bandpass filters
- Highpass abd bandstop filters
- Full-wave electromagnetic simulation
- Advanced materials and technologies
- Coupled resonator circuits
- Computer-aided design for low-cost/higt-volume production
- Compact filters and filter minaturization.Numéro de notice : 11725 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54480 Oberflächenrekonstruktion mit Hilfe einer Mehrbild-Shape-from-Shading-Methode / C. Piechullek (2000)
Titre : Oberflächenrekonstruktion mit Hilfe einer Mehrbild-Shape-from-Shading-Methode Titre original : [Reconstruction de surfaces au moyen de la méthode multi-image Shape-From-Shading] Type de document : Thèse/HDR Auteurs : C. Piechullek, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2000 Collection : DGK - C Sous-collection : Dissertationen num. 518 Importance : 98 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9557-1 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] filtre passe-bas
[Termes IGN] modèle numérique de sursol
[Termes IGN] orthoimage
[Termes IGN] reconstruction 2D du bâti
[Termes IGN] réflectanceIndex. décimale : 35.20 Traitement d'image Résumé : (Auteur) Shape from Shading is a method for surface reconstruction from digital images which exploits the fact that surface patches, having different orientations relative to a light source, are imaged with different brightness in the images. The resulting two-dimensional brightness distribution is denoted as shading and is used for the subsequent reconstruction of the surface inclinations by suitable solution methods.
In this thesis a novel multi image Shape from Shading method for the reconstruction of surfaces from multiple digital images is presented and investigated. Starting from a model for the formation of a digital image, the image grey values are related to the geometric and radiometric parameters of a surface model defined in object space. The direct computation of absolute surface heights of a digital terrain model (DTM) is accomplished by moving the object reconstruction process into object space, together with the incorporation of the perspective imaging geometry. The surface model ensures the correspondence between multiple images with low texture. The unknown DTM heights and the surface reflectance coefficient are estimated in a least squares adjustment.
In comparison to existing Shape from Shading methods, the simultaneous evaluation of multiple images on the basis of a surface model has the advantage of circumventing the inherent indeterminability of the surface inclinations. The mesh heights of a DTM are reconstructed, rather than both inclination components of all surface elements. All surface elements which lie within adjacent DTM meshes contribute to the determination of a particular DTM height. The assumption of completely diffuse reflectance of the surface is generalised by incorporating a surface reflectance model which also takes into account the observation directions of each image.
The potential of the method for the reconstruction of surfaces is investigated by theoretical considerations and accompanying simulation studies. This is accomplished by varying the spatial arrangement between surface normal, illumination direction and the observation directions, as well as by varying the number of available images, and the surface reflectance properties. It is shown that the surface reconstruction is possible, if the grey value variations within the images are greater than errors which occur during the acquisition and processing of digital imagery. Thus, planar surfaces, having no or comparatively small grey value variations cannot be reconstructed by the presented method. The indeterminability which occurs when evaluating single images with a lack of grey value gradients due to vertial observation direction or parallel illumination direction and surface normal, respectively, is overcome by the use of at least two images with different exterior orientation.
In practical simulation studies using synthetic images which have been created under the imaging and illumination conditions of the real test example, the convergence behaviour of the method is investigated. The radius of convergence is found to be comparably high (about 20 pixels in image space), but is seriously reduced by image noise. The convergence behaviour can be improved considerably. however, by low-pass filtering the images. In investigations with radiometrically distorted synthetic images it is shown that systematic errors within the reconstructed surface shape may be reduced by the simultaneous evaluation of multiple images, since there is additional, independent grey value information available.
In practical tests of the method, a set of three digitised aerial images (Mb ~ 1 : 11000) of a low-textured sand dune area are evaluated. By referring to the results of the simulation studies, the images are radiometrically corrected prior to the surface reconstruction. The radius of convergence is found to be about 16 pixels for the real imagery; thus, the independence of the obtained results from the available initial information can be assured to a large extent. The results obtained from the simultaneous evaluation of the radiometrically preprocessed images clearly demonstrate the applicability of the method to real imagery. Remaining systematic differences between the reconstruction results and the reference surface, however, indicate that grey values which have been obtained by the digitalisation of analogue images are not fully described by the underlying model for the formation of a digital image. A concluding assessment of the correctness of all assumptions concerning the reflectance properties of the imaged surface is only possible by the evaluation of images which have been acquired digitally by a radiometrically calibrated sensor.Numéro de notice : 62964 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61153 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 62964-01 35.20 Livre Centre de documentation Télédétection Disponible Modex / Stéphane Mallat (1998)
Titre : Modex : signaux et systèmes, [réimpression de 2007] Type de document : Guide/Manuel Auteurs : Stéphane Mallat, Auteur Editeur : Palaiseau : Ecole Polytechnique EP Année de publication : 1998 Importance : 137 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] compression d'image
[Termes IGN] compression de données
[Termes IGN] convolution (signal)
[Termes IGN] filtrage linéaire
[Termes IGN] filtre passe-bande
[Termes IGN] filtre passe-bas
[Termes IGN] modèle par fonctions rationnelles
[Termes IGN] quantité discrète
[Termes IGN] repliement de spectre
[Termes IGN] série de Fourier
[Termes IGN] signal aléatoire
[Termes IGN] signal analogique
[Termes IGN] traitement d'image
[Termes IGN] traitement du signal
[Termes IGN] transformation de Fourier
[Termes IGN] transformation de Laplace
[Termes IGN] transformation en ZIndex. décimale : 24.20 Traitement du signal Numéro de notice : 13957 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Manuel de cours Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=46363 A study of GPS and other navigation systems for high precision navigation and attitude determinations / W.X. Fu (1996)
Titre : A study of GPS and other navigation systems for high precision navigation and attitude determinations Type de document : Monographie Auteurs : W.X. Fu, Auteur Editeur : Kensington [Australie] : University of New South Wales Année de publication : 1996 Collection : Unisurv Report num. S-45 Importance : 332 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-0-85839-069-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] filtre de Kalman
[Termes IGN] filtre passe-bas
[Termes IGN] GPS-INS
[Termes IGN] méthode des moindres carrés
[Termes IGN] orientation
[Termes IGN] positionnement par géodésie spatiale
[Termes IGN] positionnement par GNSS
[Termes IGN] système de coordonnées
[Termes IGN] système de positionnement par satellitesIndex. décimale : 30.60 Géodésie spatiale Résumé : (Auteur) Since 1960's the navigation techniques have experienced a revolutionary advance, which due to the advent of some new kinds of navigation systems, such as inertial navigation system and satellite navigation system, under the background of rapid development of computer technologies, optimal estimation and modern control theory. All navigation information can now be used jointly and optimally, and the integrated navigation system has become standard navigation tool.
This research involved the analysis and investigation of navigation systems (mainly the GPS and integrated navigation systems) and navigation computation for high precision navigation and attitude determination, especially for marine application. The emphasis of the research was to find new methods and concepts to deal with the traditional navigation problems.
The navigation models were analyzed in both time and frequency domains and the model's stability; controllability and observability with GPS observables were introduced in order to facilitate the navigation filter design.
New kind of filters, such as frequency-discriminating filters and separated-bias Kaiman filter, were introduced to navigation data processing, and these filters are useful for GPS data smoothing, cycle slip detection and repair and ambiguity resolution in both static and kinematic modes.
Based on the navigation system and equipment operation and error analysis, a closed-loop dead reckoning integration with other navigation systems (GPS, Omega, Loran-C and radar) was proposed in order to obtain a good system frequency response and facilitate the body's manoeuvre detection and system quality control.
To use GPS potential efficiently, a new GPS observable "Doppler created phase" was introduced and associate algorithms were developed. This new observable can be used in both static and kinematic positioning (if the data rate is high enough) using low-cost navigation receivers (output C/A code and Doppler only), and theoretically an accuracy of equivalent to a phase-floatingambiguity solution can be expected.
Extensive analysis was given to the attitude determination using GPS, and its limits, potential and alternative implementation are also presented.
The software development and data processing validated the proposed theory and algorithms. The results and statistic tests were illustrated by the different kind of plots including the correlograms and periodograms.Numéro de notice : 63989 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61247 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 63989-01 30.60 Livre Centre de documentation Géodésie Disponible Automatisation de l'extraction du réseau routier sur cartes JOG digitalisées / Marc Pierrot-Deseilligny (1991)PermalinkLow-pass spatial filtering of satellite radar data / P.W. Mueller in Photogrammetric Engineering & Remote Sensing, PERS, vol 55 n° 6 (june 1989)PermalinkDétermination automatique de rosaces directionnelles à partir de données de télédétection : apports à une étude classique de tectonique régionale (Cévennes) : résultats préliminaires / A. Blusson in Bulletin [Société Française de Photogrammétrie et Télédétection], n° 98 (Avril 1985)PermalinkLa thermographie infrarouge / G. Gaussorgues (1984)Permalink