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Retrieving ocean surface current by 4D variational assimilation of Sea Surface Temperature images / G. Korotaev in Remote sensing of environment, vol 112 n° 4 (15/04/2008)
[article]
Titre : Retrieving ocean surface current by 4D variational assimilation of Sea Surface Temperature images Type de document : Article/Communication Auteurs : G. Korotaev, Auteur ; E. Huot, Auteur ; F.X. Le Dimet, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 1295 - 1305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] champ de vitesse
[Termes IGN] courant marin
[Termes IGN] image NOAA-AVHRR
[Termes IGN] température de surface de la mer
[Termes IGN] variation
[Termes IGN] visualisation 4DRésumé : (Auteur) In this article, we propose a new method to estimate ocean mesoscale structures of the surface current velocity by processing sea surface satellite images. Assuming that the intensity level can be described by a transport–diffusion equation, the proposed approach is based on variational assimilation of image observations within a simple transport–diffusion model. This approach permits to retrieve the current velocity field from a sequence of satellite images. Results of processing synthetic data and real NOAA-AVHRR satellite images are presented and commented. Copyright Elsevier Numéro de notice : A2008-094 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2007.04.020 En ligne : https://doi.org/10.1016/j.rse.2007.04.020 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29089
in Remote sensing of environment > vol 112 n° 4 (15/04/2008) . - pp 1295 - 1305[article]Mapping dominant vegetation communities at Meili Snow Mountain, Yunnan Province, China using satellite imagery and plant community data / Z. Zhang in Geocarto international, vol 23 n° 2 (April - May 2008)
[article]
Titre : Mapping dominant vegetation communities at Meili Snow Mountain, Yunnan Province, China using satellite imagery and plant community data Type de document : Article/Communication Auteurs : Z. Zhang, Auteur ; E. De Clercq, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 135 - 153 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] analyse spatiale
[Termes IGN] carte de la végétation
[Termes IGN] classification bayesienne
[Termes IGN] classification par maximum de vraisemblance
[Termes IGN] flore locale
[Termes IGN] Kappa de Cohen
[Termes IGN] milieu naturel
[Termes IGN] montagne
[Termes IGN] occupation du sol
[Termes IGN] répartition géographique
[Termes IGN] Yunnan (Chine)Résumé : (Auteur) Mapping dominant vegetation communities is important work for vegetation scientists. It is very difficult to map dominant vegetation communities using multispectral remote sensing data only, especially in mountain areas. However plant community data contain useful information about the relationships between plant communities and their environment. In this paper, plant community data are linked with remote sensing to map vegetation communities. The Bayesian soft classifier was used to produce posterior probability images for each class. These images were used to calculate the prior probabilities. One hundred and eighty plant plots at Meili Snow Mountain, Yunnan Province, China were used to characterize the vegetation distribution for each class along altitude gradients. Then, the frequencies were used to modify the prior probabilities of each class. After stratification in a vegetation part and a non-vegetation part, a maximum-likelihood classification with equal prior probabilities was conducted, yielding an overall accuracy of 82.1% and a kappa accuracy of 0.797. Maximum-likelihood classification with modified prior probabilities in the vegetation part, conducted with a conventional maximum-likelihood classification for the non-vegetation part, yielded an overall accuracy of 87.7%, and a kappa accuracy of 0.861. Copyright Taylor & Francis Numéro de notice : A2008-078 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040701337410 En ligne : https://doi.org/10.1080/10106040701337410 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29073
in Geocarto international > vol 23 n° 2 (April - May 2008) . - pp 135 - 153[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-08021 RAB Revue Centre de documentation En réserve L003 Disponible Per-pixel classification of high spatial resolution satellite imagery for urban land-cover mapping / D. Hester in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 4 (April 2008)
[article]
Titre : Per-pixel classification of high spatial resolution satellite imagery for urban land-cover mapping Type de document : Article/Communication Auteurs : D. Hester, Auteur ; H. Cakir, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 463 - 471 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] Caroline du Nord (Etats-Unis)
[Termes IGN] carte d'occupation du sol
[Termes IGN] cartographie urbaine
[Termes IGN] classification pixellaire
[Termes IGN] erreur de classification
[Termes IGN] image à très haute résolution
[Termes IGN] image Quickbird
[Termes IGN] précision géométrique (imagerie)Résumé : (Auteur) Commercial high spatial resolution satellite data now provide a synoptic and consistent source of digital imagery with detail comparable to that of aerial photography. In the work described here, per-pixel classification, image fusion, and GIS-based map refinement techniques were tailored to pan-sharpened 0.61 m QuickBird imagery to develop a six-category urban land-cover map with 89.3 percent overall accuracy (k = 0.87). The study area was a rapidly developing 71.5 km2 part of suburban Raleigh, North Carolina, U.S.A., within the Neuse River basin. “Edge pixels” were a source of classification error as was spectral overlap between bare soil and impervious surfaces and among vegetated cover types. Shadows were not a significant source of classification error. These findings demonstrate that conventional spectral-based classification methods can be used to generate highly accurate maps of urban landscapes using high spatial resolution imagery. Copyright ASPRS Numéro de notice : A2008-123 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.74.4.463 En ligne : https://doi.org/10.14358/PERS.74.4.463 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29118
in Photogrammetric Engineering & Remote Sensing, PERS > vol 74 n° 4 (April 2008) . - pp 463 - 471[article]Reconciliation of inconsistent perspectives in collaborative GIS / J. Chen in Cartography and Geographic Information Science, vol 35 n° 2 (April 2008)
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Titre : Reconciliation of inconsistent perspectives in collaborative GIS Type de document : Article/Communication Auteurs : J. Chen, Auteur ; C. He, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 77 - 89 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] analyse des besoins
[Termes IGN] analyse informatique
[Termes IGN] modèle conceptuel de données
[Termes IGN] outil d'aide à la décision
[Termes IGN] prototype
[Termes IGN] SIG participatifRésumé : (Auteur) Collaborative GIS provides a spatially referenced negotiation environment for decision makers to put forward their perspectives, discuss their differences, and, ultimately, make decisions. Recent research has focused on enabling the representation of, and selection from among, different opinions, while discussion among people has been ignored. This paper reports on a discussion process aimed at reconciling inconsistent perspectives in distributed workgroups. The Speech Act Theory (SAT) of Austin was extended to define both non-spatial and spatial speech acts in the context of a negotiation. A coordination process was modeled by these speech acts. Then, inconsistent perspectives were reconciled using detection of inconsistency, or initial integration of perspectives, or reconciliation of collaborators. The method we propose makes it possible to effectively describe the speech acts and use them to naturally represent the reconciliation process. A prototype system based on this approach was implemented in experiments. Their results demonstrate that a good abstraction of the negotiation process will facilitate the coordination of discussion among people and provide a criterion for system designers. Copyright CaGISociety Numéro de notice : A2008-190 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : 10.1559/152304008784090586 En ligne : https://doi.org/10.1559/152304008784090586 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29185
in Cartography and Geographic Information Science > vol 35 n° 2 (April 2008) . - pp 77 - 89[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-08021 RAB Revue Centre de documentation En réserve L003 Disponible Sensitivity analysis of spatially aggregated responses: a gradient-based method / F. Pantus in International journal of geographical information science IJGIS, vol 22 n° 4-5 (april 2008)
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Titre : Sensitivity analysis of spatially aggregated responses: a gradient-based method Type de document : Article/Communication Auteurs : F. Pantus, Auteur ; N. Ellis, Auteur ; H. Possingham, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 575 - 599 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] agrégation spatiale
[Termes IGN] algorithme du gradient
[Termes IGN] analyse de sensibilité
[Termes IGN] données socio-économiques
[Termes IGN] espace vectoriel
[Termes IGN] noeud
[Termes IGN] polygoneRésumé : (Auteur) We often need to report on environmental, economic and social indicators, and properties at aggregated spatial scales, e.g. average income per suburb. To do this, we invariably create reporting polygons that are somewhat arbitrary. The question arises: how much does this arbitrary subdivision of space affect the outcome? In this paper, we develop a new, gradient-based framework for carrying out a rigorous analysis of the sensitivity of integrating functions to quantitative changes in their spatial configuration. This approach is applied to both analytical and empirical models, and it allows the reporting of a hierarchy of sensitivity measures (from global to local). We found that the concepts of a vector space representing the spatial configurations and the response (hyper-)surface on which gradients indicate the sensitivities to be helpful in developing the sensitivity analytical framework of spatial configurations in different dimensions. This approach works well with both analytical and empirical integrating functions. This approach resulted in a clear ranking of the sensitivities of the responses to changes in the reporting regions in an existing environmental reporting application. The approach also allowed us to find which vertices, and the directions of change of those vertices, influenced the outcome most. The application of the spatial framework allows the results to be reported in a hierarchical way, from the sensitivities of an integrative response to changes in a whole reserve/reporting system, down to the sensitivity along each of the dimensions of the vertices in the spatial configuration. The results of the spatial sensitivity framework that we developed in this paper can be readily visualized by plotting the sensitivities as vectors on geographic maps. This simplifies the presentation and facilitates the uptake of the results in the situations where the spatial configurations are complicated. Numéro de notice : A2008-155 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810701587784 En ligne : https://doi.org/10.1080/13658810701587784 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29150
in International journal of geographical information science IJGIS > vol 22 n° 4-5 (april 2008) . - pp 575 - 599[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 079-08031 RAB Revue Centre de documentation En réserve L003 Disponible 079-08032 RAB Revue Centre de documentation En réserve L003 Disponible SIEVE: collaborative decision-making in an immersive online environment / C. Stock in Cartography and Geographic Information Science, vol 35 n° 2 (April 2008)PermalinkThe early explanatory power of NDVI in crop yield modelling / L. Wall in International Journal of Remote Sensing IJRS, vol 29 n° 7 (April 2008)PermalinkPremière description d’une épidémie de dengue dans une commune de l’intérieur de la Guyane : Maripasoula, France, février 2006 / Jean-Baptiste Meynard in Bulletin épidémiologique hebdomadaire, vol 2008 n° 13 ([25/03/2008])PermalinkApplications of ICA for the enhancement and classification of polarimetric SAR images / H. Wang in International Journal of Remote Sensing IJRS, vol 29 n° 6 (March 2008)PermalinkTwo-scale surface deformation analysis using the SBAS-DInSAR technique: a case study of the city of Rome, Italy / M. Manunta in International Journal of Remote Sensing IJRS, vol 29 n° 6 (March 2008)Permalink3D vegetation mapping using small-footprint full-waveform airborne laser scanners / W. Wagner in International Journal of Remote Sensing IJRS, vol 29 n° 5 (March 2008)PermalinkAssessment of the influence of flying altitude and scan angle on biophysical vegetation products derived from airborne laser scanning / F. Morsdorf in International Journal of Remote Sensing IJRS, vol 29 n° 5 (March 2008)PermalinkAutomatic forest inventory parameter determination from terrestrial laser scanner data / Hans-Gerd Maas in International Journal of Remote Sensing IJRS, vol 29 n° 5 (March 2008)PermalinkAide à la décision pour la conception de systèmes complexes: une approche SMA / M. Augeraud in Ingénierie des systèmes d'information, ISI : Revue des sciences et technologies de l'information, RSTI, vol 13 n° 2 (mars - avril 2008)PermalinkAn application of advanced spatio-temporal formalisms to behavioural ecology / A. Raffaeta in Geoinformatica, vol 12 n° 1 (March - May 2008)Permalink