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Qualité des données géographiques : à propos de la propagation des incertitudes / Gilles Troispoux in Signature, n° 59 (janvier 2016)
[article]
Titre : Qualité des données géographiques : à propos de la propagation des incertitudes Type de document : Article/Communication Auteurs : Gilles Troispoux, Auteur Année de publication : 2016 Article en page(s) : pp 5 - 6 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] données localisées
[Termes IGN] incertitude des données
[Termes IGN] méthode de Monte-Carlo
[Termes IGN] propagation d'erreur
[Termes IGN] qualité des donnéesRésumé : (auteur) [introduction] Nous avions informé, dans le numéro 57 de Sign@ture, que nos travaux en matière de qualité des données géographiques durant l’année 2015 porteraient sur deux sujets, la mise en place d’un groupe de travail devant proposer une méthode simplifiée pour qualifier les données et la participation à l’encadrement d’un mastère SILAT de six mois. L’objectif principal de ce mastère était de pouvoir quantifier le niveau d’incertitude de l’indicateur bisannuel de consommation de terres agricoles calculé par la méthode du différentiel agricole inventorié (DAI), mise en place par la DREAL et la DRAAF Rhône-Alpes. Numéro de notice : A2016-238 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80774
in Signature > n° 59 (janvier 2016) . - pp 5 - 6[article]Geometric accuracy analysis model of the ZiYuan-3 satellite without GCPs / Xinming Tang in Photogrammetric Engineering & Remote Sensing, PERS, vol 81 n° 12 (December 2015)
[article]
Titre : Geometric accuracy analysis model of the ZiYuan-3 satellite without GCPs Type de document : Article/Communication Auteurs : Xinming Tang, Auteur ; Ping Zhou, Auteur ; Guo Zhang, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 927 - 934 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] estimation des paramètres
[Termes IGN] évaluation des données
[Termes IGN] évaluation des paramètres
[Termes IGN] image ZiYuan-3
[Termes IGN] modèle géométrique de prise de vue
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] propagation d'erreur
[Termes IGN] source d'erreurRésumé : (auteur) The ZiYuan-3 satellite (ZY-3) was China’s first civilian stereo mapping satellite designed to meet the 1:50 000 scale mapping requirements. We analyzed main error sources influencing the geometric accuracy of the ZY-3 images, and the error propagation rules of these error sources in image production. Accuracy estimation models of ZY-3 images without ground control points (GCPs) were deduced and the theoretical geometric accuracy of ZY-3 images was obtained. Without GCPs, 556 ZY-3 panchromatic nadir images covering 3,500,000 km2 of the Chinese mid-west region and 12 ZY-3 stereo image pairs covering 14,000 km2 around Taiyuan of China were used for planar and vertical accuracy verification, respectively. The experimental results confirmed the correctness of the accuracy estimation model for ZY-3 images. The accuracy results obtained through the model and experiment showed that without GCPs, the geometric accuracy of the ZY-3 images satisfied the Chinese stereo mapping requirements for 1:50 000 scale topographic maps Numéro de notice : A2015-992 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.81.12.927 En ligne : https://doi.org/10.14358/PERS.81.12.927 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80273
in Photogrammetric Engineering & Remote Sensing, PERS > vol 81 n° 12 (December 2015) . - pp 927 - 934[article]Impacts of species misidentification on species distribution modeling with presence-only data / Hugo Costa in ISPRS International journal of geo-information, vol 4 n°4 (December 2015)
[article]
Titre : Impacts of species misidentification on species distribution modeling with presence-only data Type de document : Article/Communication Auteurs : Hugo Costa, Auteur ; Giles M. Foody, Auteur ; Silvia Jiménez, Auteur ; Luis Silva, Auteur Année de publication : 2015 Article en page(s) : pp 2496 - 2518 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] analyse spatiale
[Termes IGN] distribution spatiale
[Termes IGN] entropie maximale
[Termes IGN] erreur d'approximation
[Termes IGN] identification automatique
[Termes IGN] modèle de simulation
[Termes IGN] propagation d'erreurRésumé : (auteur) Spatial records of species are commonly misidentified, which can change the predicted distribution of a species obtained from a species distribution model (SDM). Experiments were undertaken to predict the distribution of real and simulated species using MaxEnt and presence-only data “contaminated” with varying rates of misidentification error. Additionally, the difference between the niche of the target and contaminating species was varied. The results show that species misidentification errors may act to contract or expand the predicted distribution of a species while shifting the predicted distribution towards that of the contaminating species. Furthermore the magnitude of the effects was positively related to the ecological distance between the species’ niches and the size of the error rates. Critically, the magnitude of the effects was substantial even when using small error rates, smaller than common average rates reported in the literature, which may go unnoticed while using a standard evaluation method, such as the area under the receiver operating characteristic curve. Finally, the effects outlined were shown to impact negatively on practical applications that use SDMs to identify priority areas, commonly selected for various purposes such as management. The results highlight that species misidentification should not be neglected in species distribution modeling. Numéro de notice : A2015--004 Affiliation des auteurs : non IGN Thématique : BIODIVERSITE/GEOMATIQUE Nature : Article DOI : 10.3390/ijgi4042496 Date de publication en ligne : 16/11/2015 En ligne : https://doi.org/10.3390/ijgi4042496 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101798
in ISPRS International journal of geo-information > vol 4 n°4 (December 2015) . - pp 2496 - 2518[article]A novel negative abundance‐oriented hyperspectral unmixing algorithm / Rubén Marrero in IEEE Transactions on geoscience and remote sensing, vol 53 n° 7 (July 2015)
[article]
Titre : A novel negative abundance‐oriented hyperspectral unmixing algorithm Type de document : Article/Communication Auteurs : Rubén Marrero, Auteur ; Sebastian Lopez, Auteur ; Gustavo Callicó, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 3772 - 3790 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique
[Termes IGN] analyse de mélange spectral d’extrémités multiples
[Termes IGN] analyse des mélanges spectraux
[Termes IGN] image hyperspectrale
[Termes IGN] propagation d'erreur
[Termes IGN] variabilitéRésumé : (Auteur) Spectral unmixing is a popular technique for analyzing remotely sensed hyperspectral data sets with subpixel precision. Over the last few years, many algorithms have been developed for each of the main processing steps involved in spectral unmixing (SU) under the LMM assumption: 1) estimation of the number of endmembers; 2) identification of the spectral signatures of the endmembers; and 3) estimation of the abundance of endmembers in the scene. Although this general processing chain has proven to be effective for unmixing certain types of hyperspectral images, it also has some drawbacks. The first one comes from the fact that the output of each stage is the input of the following one, which favors the propagation of errors within the unmixing chain. A second problem is the huge variability of the results obtained when estimating the number of endmembers of a hyperspectral scene with different state-of-the-art algorithms, which influences the rest of the process. A third issue is the computational complexity of the whole process. To address the aforementioned issues, this paper develops a novel negative abundance-oriented SU algorithm that covers, for the first time in the literature, the main steps involved in traditional hyperspectral unmixing chains. The proposed algorithm can also be easily adapted to a scenario in which the number of endmembers is known in advance and two additional variations of the algorithm are provided to deal with high-noise scenarios and to significantly reduce its execution time, respectively. Our experimental results, conducted using both synthetic and real hyperspectral scenes, indicate that the presented method is highly competitive (in terms of both unmixing accuracy and computational performance) with regard to other SU techniques with similar requirements, while providing a fully self-contained unmixing chain without the need for any input parameters. Numéro de notice : A2015-317 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2014.2383440 En ligne : https://doi.org/10.1109/TGRS.2014.2383440 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76567
in IEEE Transactions on geoscience and remote sensing > vol 53 n° 7 (July 2015) . - pp 3772 - 3790[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-2015071 RAB Revue Centre de documentation En réserve L003 Disponible Analysis of star camera errors in GRACE data and their impact on monthly gravity field models / Pedro Inácio in Journal of geodesy, vol 89 n° 6 (June 2015)
[article]
Titre : Analysis of star camera errors in GRACE data and their impact on monthly gravity field models Type de document : Article/Communication Auteurs : Pedro Inácio, Auteur ; Pavel Ditmar, Auteur ; Roland Klees, Auteur ; Hassan Hashemi Farahani, Auteur Année de publication : 2015 Article en page(s) : pp 551 - 571 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] acquisition de données
[Termes IGN] analyse diachronique
[Termes IGN] anomalie de pesanteur
[Termes IGN] capteur spatial
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] données GRACE
[Termes IGN] erreur de mesure
[Termes IGN] impact sur les données
[Termes IGN] modèle d'erreur
[Termes IGN] orientation du capteur
[Termes IGN] propagation d'erreurRésumé : (auteur) Star cameras (SCs) on board the GRACE satellites provide information about the attitudes of the spacecrafts. This information is needed to reduce the K-band ranging data to the centre of mass of the satellites. In this paper, we analyse GRACE SC errors using two months of real data of the primary and secondary SCs. We show that the errors consist of a harmonic component, which is highly correlated with the satellite’s true anomaly, and a stochastic component. We built models of both error components, and use these models for error propagation studies. Firstly, we analyse the propagation of SC errors into inter-satellite accelerations. A spectral analysis reveals that the stochastic component exceeds the harmonic component, except in the 3–10 mHz frequency band. In this band, which contains most of the geophysically relevant signal, the harmonic error component is larger than the random component. Secondly, we propagate SC errors into optimally filtered monthly mass anomaly maps and compare them with the total error. We found that SC errors account for about 18 % of the total error. Moreover, gaps in the SC data series amplify the effect of SC errors by a factor of 5. Finally, an analysis of inter-satellite pointing angles for GRACE data between 2003 and 2010 reveals that inter-satellite ranging errors were exceptionally large during the period February 2003 till May 2003. During these months, SC noise is amplified by a factor of 3 and is a considerable source of errors in monthly GRACE mass anomaly maps. In the context of future satellite gravity missions, the noise models developed in this paper may be valuable for mission performance studies. Numéro de notice : A2015-350 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0797-1 Date de publication en ligne : 03/03/2015 En ligne : https://doi.org/10.1007/s00190-015-0797-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76724
in Journal of geodesy > vol 89 n° 6 (June 2015) . - pp 551 - 571[article]In situ calibration of light sensors for long-term monitoring of vegetation / Hongxiao Jin in IEEE Transactions on geoscience and remote sensing, vol 53 n° 6 (June 2015)PermalinkMulti-view 3D circular target reconstruction with uncertainty analysis / Bahman Soheilian in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol II-3 (September 2014)PermalinkError analysis of a mobile terrestrial LiDAR system / M. Leslar in Geomatica, vol 68 n° 3 (September 2014)PermalinkRegistration and visualisation of deformation maps from terrestrial radar interferometry using photogrammetry and structure from motion / Rafael Caduff in Photogrammetric record, vol 29 n° 146 (June - August 2014)PermalinkGeo-referencing point clouds with transformational and positional uncertainties / Jens-André Paffenholz in Journal of applied geodesy, vol 6 n° 1 (January 2012)PermalinkSimultaneous denoising and intrinsic order selection in hyperspectral imaging / M. Farzam in IEEE Transactions on geoscience and remote sensing, vol 49 n° 9 (September 2011)PermalinkOptimiser la performance de calcul pour la cartographie en temps réel avec un laser scanner aéroporté / Jan Skaloud in Géomatique suisse, vol 109 n° 6 (juin 2011)PermalinkGlobal sea-level rise and its relation to the terrestrial reference frame / Xavier Collilieux in Journal of geodesy, vol 85 n° 1 (January 2011)PermalinkL'aspect mobile d'un scanner laser terrestre / M. Alshawa in Revue Française de Photogrammétrie et de Télédétection, n° 192 (Septembre 2010)PermalinkPropagating error in land-cover-change analyses: impact of temporal dependence under increased thematic complexity / A. Burnicki in International journal of geographical information science IJGIS, vol 24 n°7-8 (july 2010)Permalink