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Validity of historical volunteered geographic information: Evaluating citizen data for mapping historical geographic phenomena / Guiming Zhang in Transactions in GIS, vol 22 n° 1 (February 2018)  

Public [article]  inTransactions in GIS > vol 22 n° 1 (February 2018) . - pp 149 - 164 Titre : Validity of historical volunteered geographic information: Evaluating citizen data for mapping historical geographic phenomena Type de document : Article/Communication Auteurs : Guiming Zhang, Auteur ; A - Xing Zhu, Auteur ; Zhi‐Pang Huang, Auteur ; Guopeng Ren, Auteur ; Cheng‐Zhi Qin, Auteur ; Wen Xiao, Auteur Année de publication : 2018 Article en page(s) : pp 149 - 164 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie thématique [Termes IGN] cartographie historique [Termes IGN] distribution spatiale [Termes IGN] données localisées des bénévoles [Termes IGN] habitat animal [Termes IGN] phénomène géographique [Termes IGN] Simiiformes [Termes IGN] validité des données [Termes IGN] Yunnan (Chine) Résumé : (auteur) Studies on volunteered geographic information (VGI) have focused on examining its validity to reveal geographic phenomena in relatively recent periods. Empirical evaluation of the validity of VGI to reveal geographic phenomena in historical periods (e.g., decades ago) is lacking, although such evaluation is desirable for assessing the possibility of broadening the temporal scope of VGI applications. This article presents an evaluation of the validity of VGI to reveal historical geographic phenomena through a citizen data‐based habitat suitability mapping case study. Citizen data (i.e., sightings) of the black‐and‐white snub‐nosed monkey (Rhinopithecus bieti) were elicited from local residents through three‐dimensional (3D) geovisualization interviews in Yunnan, China. The validity of the elicited sightings to reveal the historical R. bieti distribution was evaluated through habitat suitability mapping using the citizen data in historical periods. The results of controlled experiments demonstrated that suitability maps predicted using the historical citizen data had a consistent spatial pattern (correlation above 0.60) that reflects the R. bieti distribution (Boyce index around 0.90) in areas free of significant environmental change across historical periods. This in turn suggests that citizen data have validity for mapping historical geographic phenomena. It provides supporting empirical evidence for potentially broadening the temporal scope of VGI applications. Numéro de notice : A2018-066 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12300 En ligne : https://doi.org/10.1111/tgis.12300 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89422 [article]

Sentinel-2 level-1 calibration and validation status from the mission performance centre / Catherine Bouzinac (2018)  

Public Titre : Sentinel-2 level-1 calibration and validation status from the mission performance centre Type de document : Article/Communication Auteurs : Catherine Bouzinac, Auteur ; Bruno Lafrance, Auteur ; Laetitia Pessiot, Auteur ; Dimitra Touli, Auteur ; Mathieu Jung, Auteur ; Stéphane Massera , Auteur ; Marion Neveu-VanMalle, Auteur ; Aude Espesset, Auteur ; Benjamin Francesconi, Auteur ; Sébastien Clerc, Auteur ; Jan Jackson, Auteur ; Bahjat Alhammoud, Auteur ; Françoise Viallefont, Auteur ; Enrico G. Cadau, Auteur ; Rosario Iannone, Auteur ; Ferran Gascon, Auteur Editeur : New York : Institute of Electrical and Electronics Engineers IEEE Année de publication : 2018 Projets : 2-Pas d'info accessible - article non ouvert / Conférence : IGARSS 2018, IEEE International Geoscience And Remote Sensing Symposium, observing, understanding and forecasting the dynamics of our planet 22/07/2018 27/07/2018 Valencia Espagne Proceedings IEEE Importance : pp 4351 - 4354 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] image Sentinel-MSI [Termes IGN] image Sentinel-SAR [Termes IGN] métadonnées [Termes IGN] validité des données Résumé : (auteur) As part of the Copernicus programme of the European Commission (EC), the European Space Agency (ESA) operates the Sentinel-2 mission that acquires high spatial resolution optical imagery. The consistency of the image time series is ensured by some specific performance requirements such as multi-temporal spatial registration and radiometric stability, routinely monitored by the Sentinel-2 Mission Performance Centre (S2MPC). The products also provide a rich set of metadata and auxiliary data to support high-level processing activities. This presentation provides a description of the main level-1 products calibration and validation activities, performed by the S2MPC including several Expert Support Laboratories (ESL). Measured performances and analysed results show the good quality of the mission products both in terms of radiometry and geometry. The current performances for Sentinel-2A and Sentinel-2B are compared to mission product quality requirements. Numéro de notice : C2018-058 Affiliation des auteurs : IGN+Ext (2012-2019) Autre URL associée : vers HAL Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1109/IGARSS.2018.8518033 Date de publication en ligne : 05/11/2018 En ligne : https://doi.org/10.1109/IGARSS.2018.8518033 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91374

Testing software receivers / A. Mitelman in GPS world, vol 20 n° 12 (December 2009)

Public [article]  inGPS world > vol 20 n° 12 (December 2009) . - pp 28 - 34 Titre : Testing software receivers Type de document : Article/Communication Auteurs : A. Mitelman, Auteur ; J. Almqvist, Auteur ; R. Hakanson, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 28 - 34 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] instrument de géodésie [Termes IGN] logiciel de post-traitement GPS [Termes IGN] récepteur GPS [Termes IGN] traitement de données GNSS [Termes IGN] validité des données Résumé : (Auteur) To meet the challenges inherent in producing a low-cost, highly CPU-efficient software receiver, the multiple offset post-processing method leverages the unique features of software GNSS to greatly improve the coverage and statistical validity of receiver testing compared to traditional, hardware-based testing setups, in some cases by an order of magnitude or more. Copyright Questex Media Group Numéro de notice : A2009-479 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30108 [article]

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Spatial objects / R. Thompson in GIM international, vol 22 n° 7 (July 2008)

Public [article]  inGIM international > vol 22 n° 7 (July 2008) . - pp 23 - 27 Titre : Spatial objects Type de document : Article/Communication Auteurs : R. Thompson, Auteur ; Peter J. M. Van Oosterom, Auteur Année de publication : 2008 Article en page(s) : pp 23 - 27 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] base de données localisées [Termes IGN] cohérence des données [Termes IGN] coordonnées cartésiennes géocentriques [Termes IGN] normalisation [Termes IGN] objet géographique 3D [Termes IGN] objet géographique complexe [Termes IGN] polyèdre convexe [Termes IGN] polytope [Termes IGN] représentation vectorielle [Termes IGN] spécification de produit [Termes IGN] validité des données Résumé : (Auteur) With the expending use of spatial information comes a growing need to interchange this information. Parallel runs of development of spatial databases serving multiple applications. Both have highlighted the need for consistency of representation and behaviour of spatial objects across computing platforms. Copyright Reed Business Information Numéro de notice : A2008-219 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29214 [article]

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Geometric validation of a ground-based mobile laser scanning system / D. Barber in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 63 n° 1 (January - February 2008) . - pp 128 - 141 Titre : Geometric validation of a ground-based mobile laser scanning system Type de document : Article/Communication Auteurs : D. Barber, Auteur ; Jon Mills, Auteur ; S. Smith-Voysey, Auteur Année de publication : 2008 Article en page(s) : pp 128 - 141 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] données laser [Termes IGN] données localisées 3D [Termes IGN] lasergrammétrie [Termes IGN] lever topographique [Termes IGN] milieu urbain [Termes IGN] outil d'aide à la décision [Termes IGN] précision des données [Termes IGN] semis de points [Termes IGN] système de numérisation mobile [Termes IGN] validité des données Résumé : (Auteur) This paper outlines a study, carried out on behalf of a national mapping agency, to validate laser scanned point cloud data collected by a ground-based mobile mapping system. As the need for detailed three-dimensional data about our environment continues to grow, ground-based mobile systems are likely to find an increasingly important niche in national mapping agency applications. For example, such systems potentially provide the most efficient data capture for numerical modelling and/or visualisation in support of decision making, filling a void between static terrestrial and mobile airborne laser scanning. This study sought to assess the precision and accuracy of data collected using the StreetMapper system across two test sites: a peri-urban residential housing estate with low density housing and wide streets, and a former industrial area consisting of narrow streets and tall warehouses. An estimate of system precision in both test sites was made using repeated data collection passes, indicating a measurement precision (95%) of between 0.029 m and 0.031 m had been achieved in elevation. Elevation measurement accuracy was assessed against check points collected using conventional surveying techniques at the same time as the laser scanning survey, finding RMS errors in elevation in the order of 0.03 m. Planimetric accuracy was also assessed, with results indicating an accuracy of approximately 0.10 m, although difficulties in reliably assessing planimetric accuracy were encountered. The results of this validation were compared against a theoretical error pre-analysis which was also used to show the relative components of error within the system. Finally, recommendations for future validation methodologies are outlined and possible applications of the system are briefly discussed. Copyright ISPRS Numéro de notice : A2008-041 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.07.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.07.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29036 [article]

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Southern Africa as a remote sensing test bed : the SAFARI 2000 special issue overview / J.L. Privette in International Journal of Remote Sensing IJRS, vol 26 n° 19 (October 2005)  

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Multispectral Thermal Imager: mission and applications overview / J.J. Szymanski in IEEE Transactions on geoscience and remote sensing, vol 43 n° 9 (September 2005)  

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The Cryosat data products: their generation, in-situ validation and applications / R. Francis in ESA bulletin, n° 122 (May 2005)  

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Some thoughts on inference in the analysis of spatial data / A. Stewart Fotheringham in International journal of geographical information science IJGIS, vol 18 n° 5 (august 2004)  

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