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Development of a modified neural network-based land cover classification system using automated data selector and multiresolution remotely sensed data / S. Khorram in Geocarto international, vol 26 n° 6 (October 2011)
[article]
Titre : Development of a modified neural network-based land cover classification system using automated data selector and multiresolution remotely sensed data Type de document : Article/Communication Auteurs : S. Khorram, Auteur ; H. Yuan, Auteur ; F. Van Der Wiele, Auteur Année de publication : 2011 Article en page(s) : pp 435 - 457 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse multirésolution
[Termes IGN] carte de Kohonen
[Termes IGN] classification par réseau neuronal
[Termes IGN] données multicapteurs
[Termes IGN] fusion d'images
[Termes IGN] image Landsat-TM
[Termes IGN] image SPOT
[Termes IGN] occupation du sol
[Termes IGN] Perceptron multicouche
[Termes IGN] précision de la classificationRésumé : (Auteur) Integrating multiple images with artificial neural networks (ANN) improves classification accuracy. ANN performance is sensitive to training datasets. Complexity and errors compound when merging multiple data, pointing to needs for new techniques. Kohonen's self-organizing mapping (KSOM) neural network was adapted as an automated data selector (ADS) to replace manual training data processes. The multilayer perceptron (MLP) network was then trained using automatically extracted datasets and used for classification. Two hypotheses were tested: ADS adapted from the KSOM network provides adequate and reliable training datasets, improving MLP classification performance; and fusion of Landsat Thematic Mapper (TM) and SPOT images using the modified ANN approach increases accuracy. ADS adapted from the KSOM network improved training data quality and increased classification accuracy and efficiency. Fusion of compatible multiple data can improve performance if appropriate training datasets are collected. This proved to be a viable classification scheme particularly where acquiring sufficient and reliable training datasets is difficult. Numéro de notice : A2011-402 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106049.2011.600462 Date de publication en ligne : 10/08/2011 En ligne : https://doi.org/10.1080/10106049.2011.600462 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31181
in Geocarto international > vol 26 n° 6 (October 2011) . - pp 435 - 457[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-2011061 RAB Revue Centre de documentation En réserve L003 Disponible Urban-trees extraction from Quickbird imagery using multiscale spectex-filtering and non-parametric classification / Y.O. Ouma in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 3 (May - June 2008)
[article]
Titre : Urban-trees extraction from Quickbird imagery using multiscale spectex-filtering and non-parametric classification Type de document : Article/Communication Auteurs : Y.O. Ouma, Auteur ; R. Tateishi, Auteur Année de publication : 2008 Article en page(s) : pp 333 - 351 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] algorithme de filtrage
[Termes IGN] analyse multirésolution
[Termes IGN] anisotropie
[Termes IGN] arbre (flore)
[Termes IGN] classificateur non paramétrique
[Termes IGN] classification non dirigée
[Termes IGN] classification par maximum de vraisemblance
[Termes IGN] extraction du sursol
[Termes IGN] filtrage non linéaire
[Termes IGN] image Quickbird
[Termes IGN] milieu urbain
[Termes IGN] transformation en ondelettesRésumé : (Auteur) Due to the more heterogeneous spectral-radiometric characteristics within urban land-use/cover units in very-high spatial resolution imagery, the traditional pixel-wise statistical and monoscale based classification approaches do not lead to satisfactory results. The main drawback of these methods is that they neglect the shape and context aspects of the image information, which are among the main clues for information extraction at very-high spatial resolutions. This paper presents a pre-classification filtering strategy based on unsupervised multiresolution non-linear image filtering that combines spectral and textural (spectex) image characteristics. In a multiscale model, the local texture characteristics are extracted via wavelet decomposition. The multiscale wavelets texture is then used to control the multiresolution spectral filtering process using the non-linear anisotropic diffusion approach. From the multiresolution non-linear filtering procedure, scale sub-bands suitable for urban-trees extraction are selected. The selected bands are integrated with a normalized difference vegetation index (NDVI) and a principal components transformation (PCT) for classification using a decision-tree (DT) non-parametric classifier. The DT results are compared with the statistical maximum-likelihood classifier. It has been demonstrated that with Quickbird imagery a classification based on the filtered imagery improved the extraction accuracy of urban-trees by 11.7% using the parametric maximum-likelihood classifier, and by 22.5% using the non-parametric decision-tree classifier. This is an increase from a 70.8% extraction accuracy when the respective methods are not used. The results further indicate that the non-linear filtering approach is superior to the linear (median) filtering technique, by 20.8% with respect to classification accuracy. Copyright ISPRS Numéro de notice : A2008-220 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.10.006 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.10.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29215
in ISPRS Journal of photogrammetry and remote sensing > vol 63 n° 3 (May - June 2008) . - pp 333 - 351[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-08031 SL Revue Centre de documentation Revues en salle Disponible The wavelet method as an alternative for reducing ionospheric effects from single-frequency GPS receivers / E.M. DE Souza in Journal of geodesy, vol 81 n° 12 (December 2007)
[article]
Titre : The wavelet method as an alternative for reducing ionospheric effects from single-frequency GPS receivers Type de document : Article/Communication Auteurs : E.M. DE Souza, Auteur ; João F.G. Monico, Auteur Année de publication : 2007 Article en page(s) : pp 799 - 804 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse multirésolution
[Termes IGN] double différence
[Termes IGN] perturbation ionosphérique
[Termes IGN] récepteur monofréquence
[Termes IGN] signal GPS
[Termes IGN] transformation en ondelettesRésumé : (Auteur) The ionospheric effect is one of the major errors in GPS data processing over long baselines. As a dispersive medium, it is possible to compute its influence on the GPS signal with the ionosphere-free linear combination of L1 and L2 observables, requiring dual-frequency receivers. In the case of single-frequency receivers, ionospheric effects are either neglected or reduced by using a model. In this paper, an alternative for single-frequency users is proposed. It involves multiresolution analysis (MRA) using a wavelet analysis of the double-difference observations to remove the short- and medium-scale ionosphere variations and disturbances, as well as some minor tropospheric effects. Experiments were carried out over three baseline lengths from 50 to 450 km, and the results provided by the proposed method were better than those from dual-frequency receivers. The horizontal root mean square was of about 0.28 m (1ó). Copyright Springer Numéro de notice : A2007-526 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0150-4 En ligne : https://doi.org/10.1007/s00190-007-0150-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28889
in Journal of geodesy > vol 81 n° 12 (December 2007) . - pp 799 - 804[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-07101 RAB Revue Centre de documentation En réserve L003 Disponible 266-07102 RAB Revue Centre de documentation En réserve L003 Disponible An integrated TIN and Grid method for constructing multi-resolution digital terrain models / B. Yang in International journal of geographical information science IJGIS, vol 19 n° 10 (november 2005)
[article]
Titre : An integrated TIN and Grid method for constructing multi-resolution digital terrain models Type de document : Article/Communication Auteurs : B. Yang, Auteur ; Wei Shi, Auteur ; Qi Li, Auteur Année de publication : 2005 Article en page(s) : pp 1019 - 1038 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] analyse multirésolution
[Termes IGN] modèle numérique de terrain
[Termes IGN] système d'information géographique
[Termes IGN] tessellation
[Termes IGN] Triangulated Irregular Network
[Termes IGN] visualisation 3DRésumé : (Auteur) Multi-resolution terrain models are an efficient approach to improve the speed of three dimensional (3D) visualizations, especially for terrain visualization in Geographical Information Systems (GIS). As a further development to existing algorithms and models, a new model is proposed for the construction of multiresolution terrain models in a 3D GIS. The new model represents multi-resolution terrains using two major methods for terrain representation: Triangulated Irregular Network (TIN) and regular grid (Grid). In this paper, first, the concepts and formal definitions of the new model are presented. Second, the methodology for constructing multi-resolution terrain models based on the new model is proposed. Third, the error of multi-resolution terrain models is analysed, and a set of rules is proposed to retain the important features (e.g. boundaries of man-made objects) within the multi-resolution terrain models. Finally, several experiments are undertaken to test the performance of the new model. The experimental results demonstrate that the new model can be applied to construct multi-resolution terrain models with good performance in terms of time cost and maintenance of the important features. Furthermore, a comparison with previous algorithms/models shows that the speed of rendering for 3D walking/flying through has been greatly improved by applying the new model. Numéro de notice : A2005-497 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810500391156 En ligne : https://doi.org/10.1080/13658810500391156 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27633
in International journal of geographical information science IJGIS > vol 19 n° 10 (november 2005) . - pp 1019 - 1038[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-05091 RAB Revue Centre de documentation En réserve L003 Disponible 079-05092 RAB Revue Centre de documentation En réserve L003 Disponible Linear feature detection using multi-resolution wavelet filters / S.P. Kozaitis in Photogrammetric Engineering & Remote Sensing, PERS, vol 71 n° 6 (June 2005)
[article]
Titre : Linear feature detection using multi-resolution wavelet filters Type de document : Article/Communication Auteurs : S.P. Kozaitis, Auteur ; R.H. Cofer, Auteur Année de publication : 2005 Article en page(s) : pp 689 - 697 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse multiéchelle
[Termes IGN] analyse multirésolution
[Termes IGN] détection automatique
[Termes IGN] filtre numérique
[Termes IGN] géométrie différentielle
[Termes IGN] image aérienne
[Termes IGN] route
[Termes IGN] transformation en ondelettesRésumé : (Auteur) We detected road pixels in aerial imagery using a multiresolution, wavelet-based approach. Our method involved the description of a differential geometry approach for road seed pixel detection in terms of wavelet transforms. Using this approach allowed us to extend the differential geometry approach to incorporate multiple scales. We found that using multiple scales significantly reduced the number of potential false positives. Our approach seemed to work well with a computer-assisted approach where the "seed" or potential pixels of interest should have a high confidence level of being correct. We found that our approach led to an effective method for detecting roads in aerial imagery. Our method is general, and in principle could be applied to other filtering techniques besides the one used here. Numéro de notice : A2005-218 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.71.6.689 En ligne : https://doi.org/10.14358/PERS.71.6.689 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27355
in Photogrammetric Engineering & Remote Sensing, PERS > vol 71 n° 6 (June 2005) . - pp 689 - 697[article]Filtering airborne Laser scanner data: a wavelet-based clustering method / T. Thuy in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 11 (November 2004)PermalinkA wavelet approach to road extraction from high spatial resolution remotely-sensed imagery / Qiaoping Zhang in Geomatica, vol 58 n° 1 (March 2004)PermalinkAnalyse d'images aériennes haute résolution : détection et modélisation du bâti en zone urbaine / Matthieu Cord (1998)PermalinkReconnaissance de formes dans des images de télédétection du milieu urbain / Isabelle Couloigner (1998)PermalinkAmélioration de la détection de contours en imagerie artificielle par un modèle coopératif multi-résolution / Franck Mangin (1994)PermalinkApport de la fusion d'images satellitaires multicapteurs au niveau pixel en télédétection et photo-interprétation / M. Mangolini (1994)PermalinkContribution à l’analyse automatique de documents cartographiques : interprétation de données cadastrales / Jean-Marc Ogier (1994)PermalinkApplications de la transformée en ondelettes et de l'analyse multirésolution au traitement des images de télédétection / Thierry Ranchin (1993)PermalinkOndelettes et traitement numérique du signal / A. Cohen (1992)PermalinkMerging multiresolution Spot HRV and Landsat TM data / R. Welch in Photogrammetric Engineering & Remote Sensing, PERS, vol 53 n° 3 (march 1987)Permalink