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Automatisation du traitement de données "mobile mapping" : extraction d'éléments linéaires et ponctuels / Loïc Elsholz in XYZ, n° 159 (juin 2019)  

Public [article]  inXYZ > n° 159 (juin 2019) . - pp 37 - 43 Titre : Automatisation du traitement de données "mobile mapping" : extraction d'éléments linéaires et ponctuels Type de document : Article/Communication Auteurs : Loïc Elsholz, Auteur Année de publication : 2019 Article en page(s) : pp 37 - 43 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] apprentissage profond [Termes IGN] chaîne de traitement [Termes IGN] classification par réseau neuronal convolutif [Termes IGN] contrôle qualité [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] extraction de traits caractéristiques [Termes IGN] image terrestre [Termes IGN] objet géographique linéaire [Termes IGN] objet géographique ponctuel [Termes IGN] SAGA GIS [Termes IGN] signalisation routière Résumé : (auteur) Par le passé, la compensation du réseau géodésique classique national se faisait par petits blocs et par fuseau suivant la projection UTM. Cela a engendré une propagation d’erreurs entre les blocs et des altérations linéaires au niveau des zones de jonction entre les fuseaux de la projection UTM. Cet article présente la démarche de traitement et calcul du réseau géodésique classique national Algérien, par un ajustement global (utilisant le programme CHABAKA) suivant un fuseau étendu (utilisant le programme TRANMERCAFE). L’application a concerné un réseau échantillon du réseau géodésique primordial de l’Algérie (réalisé par l’IGN, en 1955). Les résultats obtenus sont illustrés et discutés. Numéro de notice : A2019-289 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : http://www.aftopo.org/FR/xyz-4.html Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93156 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
112-2019021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Quality assessment in point feature generalization with pattern preserved / Wenhao Yu in Transactions in GIS, vol 22 n° 3 (June 2018)  

Public [article]  inTransactions in GIS > vol 22 n° 3 (June 2018) . - pp 872 - 888 Titre : Quality assessment in point feature generalization with pattern preserved Type de document : Article/Communication Auteurs : Wenhao Yu, Auteur Année de publication : 2018 Article en page(s) : pp 872 - 888 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] analyse texturale [Termes IGN] objet géographique ponctuel [Termes IGN] qualité du processus [Vedettes matières IGN] Généralisation Résumé : (Auteur) Geographical features often show certain spatial patterns on a map in terms of the arrangement of point symbols. These patterns are essentially related to the underlying geographical processes and landscapes. Thus, when deriving small‐scale maps from a large‐scale map, one of the most important constraints that cartographers or systems should follow is to retain the basic patterns of point objects on the target map. However, no research in the literature currently evaluates the quality of point feature generalization in terms of spatial pattern. This study proposes an approach to quantitatively measure the pattern change after generalization. The basic idea of the approach is to extend advanced image analysis techniques (e.g., texture recognition) to measure the patterns of point objects in a map space. Specifically, there are two main steps: firstly, the original space is converted into the raster space by utilizing a regularly spaced grid (i.e., a grayscale image) with cell attributes representing the local intensity level of point features; secondly, the texture analysis operation is performed on the grid to obtain the feature descriptors of the point pattern. The experimental results demonstrate that the proposed approach is effective in comparing the point patterns before and after generalization. Numéro de notice : A2018-581 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/tgis.12339 Date de publication en ligne : 17/08/2018 En ligne : https://doi.org/10.1111/tgis.12339 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92329 [article]

A multiscale masking method for point geographic data / K.C. Clarke in International journal of geographical information science IJGIS, vol 30 n° 1-2 (January - February 2016)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 30 n° 1-2 (January - February 2016) . - pp 300 - 315 Titre : A multiscale masking method for point geographic data Type de document : Article/Communication Auteurs : K.C. Clarke, Auteur Année de publication : 2016 Article en page(s) : pp 300 - 315 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] agrégation spatiale [Termes IGN] C (langage) [Termes IGN] droit privé [Termes IGN] GeoTrans [Termes IGN] Infrastructure de données [Termes IGN] objet géographique ponctuel [Termes IGN] protection de la vie privée [Termes IGN] transformation de coordonnées [Termes IGN] visualisation de données Résumé : (auteur) This research introduces and tests a new masking technique for sensitive point-based geospatial data. The goal of masking is to allow data to be used for general measurements of spatial distributions, but to not permit the matching of points with their true underlying observations, usually street addresses, in order to protect identity and privacy. The proposed method first converts coordinates to the Military Grid Reference System (MGRS), then uses digit switching to mask coordinates. This permits encryption at five spatial levels of precision, equivalent to 1, 10, 100, 1000, and 10,000 m. Of the 1.3M possible digit switching combinations, one is chosen that minimizes the difference between the aggregate descriptive spatial statistics for the point set as a whole between the masked and the unmasked data. Most heavily weighted in the selection is the nearest neighbor statistic, a measure of clustering in the distribution. The masking method was implemented for point sets within a single MGRS cell square using NGA’s GEOTRANS software and new custom C language code, with both forward and inverse algorithms. The forward masking saves the translation code in a separate file without which the inversion is practically impossible, meaning that the masked data can be offered publicly. Four test point distributions were used to show the method in action. The method appears to offer new possibilities for the protection of sensitive geospatial data. Numéro de notice : A2016-089 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2015.1085540 En ligne : https://doi.org/10.1080/13658816.2015.1085540 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79874 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-2016011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Knowledge formalization for vector data matching using belief theory / Ana-Maria Olteanu-Raimond in Journal of Spatial Information Science, JoSIS, n° 10 (2015)    

Public [article]  inJournal of Spatial Information Science, JoSIS > n° 10 (2015) . - pp 21 - 46 Titre : Knowledge formalization for vector data matching using belief theory Type de document : Article/Communication Auteurs : Ana-Maria Olteanu-Raimond , Auteur ; Sébastien Mustière , Auteur ; Anne Ruas , Auteur Année de publication : 2015 Article en page(s) : pp 21 - 46 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse multicritère [Termes IGN] appariement de données localisées [Termes IGN] données vectorielles [Termes IGN] formalisation [Termes IGN] objet géographique linéaire [Termes IGN] objet géographique ponctuel [Termes IGN] représentation multiple [Termes IGN] théorie de Dempster-Shafer Résumé : (auteur) Nowadays geographic vector data is produced both by public and private institutions using well defined specifications or crowdsourcing via Web 2.0 mapping portals. As a result, multiple representations of the same real world objects exist, without any links between these different representations. This becomes an issue when integration, updates, or multi-level analysis needs to be performed, as well as for data quality assessment. In this paper a multi-criteria data matching approach allowing the automatic definition of links between identical features is proposed. The originality of the approach is that the process is guided by an explicit representation and fusion of knowledge from various sources. Moreover the imperfection (imprecision, uncertainty, and incompleteness) is explicitly modeled in the process. Belief theory is used to represent and fuse knowledge from different sources, to model imperfection, and make a decision. Experiments are reported on real data coming from different producers, having different scales and either representing relief (isolated points) or road networks (linear data). Numéro de notice : A2015-538 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5311/JOSIS.2015.10.194 En ligne : http://dx.doi.org/10.5311/JOSIS.2015.10.194 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78776 [article]

Documents numériques

en open access A2015-538-194-596-3-PB.pdf Adobe Acrobat PDF

Dynamic styling for thematic mapping / Simon Moncrieff (2015) 

Public Titre : Dynamic styling for thematic mapping Type de document : Article/Communication Auteurs : Simon Moncrieff, Auteur ; Elizabeth-Kate Gulland, Auteur Editeur : [s.l.] : [s.n.] Année de publication : 2015 Conférence : FOSS4G 2015, International conference, Free and open source software for geospatial conference 14/09/2015 19/09/2015 Séoul Corée du Sud open access proceedings Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] architecture REST [Termes IGN] carte thématique [Termes IGN] cartographie à la volée [Termes IGN] cartographie dynamique [Termes IGN] démonstration de faisabilité [Termes IGN] objet cartographique [Termes IGN] objet géographique ponctuel [Termes IGN] objet géographique zonal [Termes IGN] prototype [Termes IGN] service web géographique [Termes IGN] style cartographique [Termes IGN] Styled Layer Descriptor [Vedettes matières IGN] Géovisualisation Résumé : (auteur) Current web standards have facilitated the online production and publication of thematic maps as a useful aid to interpretation of spatial data and decision making. Patterns within the raw data can be highlighted with careful styling choices, which can be defined for online maps using tools such as Styled Layer Descriptor (SLD) XML schema. Dynamic generation of maps and map styles extends their use beyond static publication and into exploration of data which may require multiple styles and visualisations for the same set of data. This paper explores the application of thematic styling options to online data, including mapping services such as Open Geospatial Consortium (OGC)-compliant Web Mapping and Web Feature Services. In order to be relevant for both user-specified and automated styling, a prototype online service was developed to explore the generation of styling schema when given data records plus the required output data type and styling parameters. Style choices were applied on-the-fly and to inform the styling characteristics of non-spatial visualisations. A stand-alone web service to produce styling definitions requires a mechanism, such as a RESTful interface, to specify its own capabilities, accept style parameters, and produce schema. The experiments in this paper are an investigation into the requirements and possibilities for such a system. Styles were applied using point and polygon feature data as well as spatially-contextual records (for example, data that includes postal codes or suburb names but no geographical feature definitions). Functionality was demonstrated by accessing it from an online geovisualisation and analysis system. This exploration was carried out as a proof of concept for generation of a map styling web service that could be used to implement automated or manual design choices. Numéro de notice : C2015-045 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Communication Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=83775

Documents numériques

en open access Dynamic styling for thematic mapping Adobe Acrobat PDF

A comprehensive multi-criteria model for high cartographic quality point-feature label placement / Maxim A. Rylov in Cartographica, vol 49 n° 1 (March 2014)  

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Filtering airborne lidar data by modified white top-hat transform with directional edge constraints / Yong Li in Photogrammetric Engineering & Remote Sensing, PERS, vol 80 n° 2 (February 2014)  

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Real-time generalization of point data in mobile and web mapping using quadtrees / Pia Bereuter in Cartography and Geographic Information Science, vol 40 n° 4 (September 2013)  

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Interpreting motion events of pairs of moving objects / B. Gottfried in Geoinformatica, vol 15 n° 2 (April 2011)  

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Radiometric Calibration of LIDAR Intensity With Commercially Available Reference Targets / S. Kaasalainen in IEEE Transactions on geoscience and remote sensing, vol 47 n° 2 (February 2009)  

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Change detection techniques for canopy height growth measurements using airborne laser scanner data / X. Yu in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 12 (December 2006)  

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A first step towards a framework for presenting the location of confidential point data on maps: results of an empirical perceptual study / Michael Leitner in International journal of geographical information science IJGIS, vol 20 n° 7 (august 2006)  

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An algorithm for the generation of Voronoi diagrams on the sphere based on QTM [quaternary triangular mesh] / Jun Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 1 (January 2003)  

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Simultaneous graphic generalization of vector data sets / Lars Harrie in Geoinformatica, vol 6 n° 3 (September - November 2002)  

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Analyse multiniveau des espaces urbains / Annabelle Boffet in Revue internationale de géomatique, vol 12 n° 2 (juin - août 2002)  

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