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Towards the production of digital terrain models from volunteered GPS trajectories / I. Massad in Survey review, vol 47 n° 344 (September 2015)
[article]
Titre : Towards the production of digital terrain models from volunteered GPS trajectories Type de document : Article/Communication Auteurs : I. Massad, Auteur ; Sagi Dalyot, Auteur Année de publication : 2015 Conférence : FIG 2014, Commission 3 Annual Workshop, Geospatial Crowdsourcing and VGI: Establishment of SDI & SIM 04/11/2014 07/11/2014 Bologne Italie Article en page(s) : pp 325 - 332 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] données localisées 2D
[Termes IGN] données localisées des bénévoles
[Termes IGN] modèle numérique de terrain
[Termes IGN] OpenStreetMap
[Termes IGN] positionnement par GPS
[Termes IGN] précision des données
[Termes IGN] production participative
[Termes IGN] qualité des données
[Termes IGN] web mapping
[Termes IGN] WikimapiaRésumé : (auteur) There currently exists a wide variety of online resources providing mapping infrastructures and geographic information. Most web-based map services, such as Google Maps, Yahoo! Maps and Bing Maps, are mostly based on data that is collected by authoritative mapping agencies. Alternatively, some relatively new web-map services, such as OpenStreetMap (OSM) and Wikimapia, are mostly based on volunteered data collected by the public (e.g. crowdsourced mapping). Although such volunteered-based map services platforms show an increasing planimetric (2D) accuracy, completeness and update-rate of their mapping infrastructure, surprisingly enough, there is a lack of comparable data and accuracy measures in respect to the third dimension, i.e. height; more specifically, the topographic representation that is based on the volunteered collected data. Most of these web services still rely on existing open-source authoritative topographic infrastructures, and not on data collected by the volunteers. Moreover, topographic information that is open to the public and is free to use, e.g. advanced spaceborne thermal emission and reflection radiometer and shuttle radar topography mission, is regularly available with relatively low height accuracy (not better than 5 m) and low planimetric resolution (over 30 m). Volunteered data, on the other hand, collected by individuals that are situated ‘all over’ the globe can offer with new capabilities and data characteristics having potentially higher qualities. This research proposes to examine the feasibility of using crowdsourced volunteered geographic information working paradigm for the task of producing a reliable digital terrain model (DTM) infrastructure for general use. This is achieved by collecting GPS observations that are available from VG data sources, while applying a 2D Kalman filter-based algorithm, aimed at reducing noise and ambiguities. This paper presents this methodology, with preliminary analysis results achieved by this implementation, showing the feasibility of this working methodology, having good results and accuracy of the DTM generated. Numéro de notice : A2015-916 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1179/1752270615Y.0000000010 En ligne : https://doi.org/10.1179/1752270615Y.0000000010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79704
in Survey review > vol 47 n° 344 (September 2015) . - pp 325 - 332[article]Point cloud server (PCS) : point clouds in-base management and processing / Rémi Cura in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol II-3 W5 (October 2015)
[article]
Titre : Point cloud server (PCS) : point clouds in-base management and processing Type de document : Article/Communication Auteurs : Rémi Cura, Auteur ; Julien Perret , Auteur ; Nicolas Paparoditis , Auteur Année de publication : 2015 Conférence : ISPRS 2015, Geospatial Week : Laserscanning, ISSDQ, CMRT, ISA, GeoVIS, GeoBigData 28/09/2015 03/10/2015 La Grande Motte France ISPRS OA Annals Article en page(s) : pp 531 - 539 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] code source libre
[Termes IGN] compression de données
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] filtrage de points
[Termes IGN] métadonnées
[Termes IGN] semis de points
[Termes IGN] serveur de données localisées
[Termes IGN] système de gestion de bases de données relationnelles
[Termes IGN] traitement de semis de pointsRésumé : (auteur) In addition to the traditional Geographic Information System (GIS) data such as images and vectors, point cloud data has become more available. It is appreciated for its precision and true three-Dimensional (3D) nature. However, managing the point cloud can be difficult due to scaling problems and specificities of this data type. Several methods exist but are usually fairly specialised and solve only one aspect of the management problem. In this work, we propose a complete and efficient point cloud management system based on a database server that works on groups of points rather than individual points. This system is specifically designed to solve all the needs of point cloud users: fast loading, compressed storage, powerful filtering, easy data access and exporting, and integrated processing. Moreover, the system fully integrates metadata (like sensor position) and can conjointly use point clouds with images, vectors, and other point clouds. The system also offers in-base processing for easy prototyping and parallel processing and can scale well. Lastly, the system is built on open source technologies; therefore it can be easily extended and customised. We test the system will several billion points of point clouds from Lidar (aerial and terrestrial ) and stereo-vision. We demonstrate ~ 400 million pts/h loading speed, user-transparent greater than 2 to 4:1 compression ratio, filtering in the approximately 50 ms range, and output of about a million pts/s, along with classical processing, such as object detection. Numéro de notice : A2015--059 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : IMAGERIE/INFORMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/isprsannals-II-3-W5-531-2015 Date de publication en ligne : 20/08/2015 En ligne : http://dx.doi.org/10.5194/isprsannals-II-3-W5-531-2015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82690
in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences > vol II-3 W5 (October 2015) . - pp 531 - 539[article]Streetgen: in-base procedural-based road generation / Rémi Cura in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol II-3 W5 (October 2015)
[article]
Titre : Streetgen: in-base procedural-based road generation Type de document : Article/Communication Auteurs : Rémi Cura, Auteur ; Julien Perret , Auteur ; Nicolas Paparoditis , Auteur Année de publication : 2015 Conférence : ISPRS 2015, Geospatial Week : Laserscanning, ISSDQ, CMRT, ISA, GeoVIS, GeoBigData 28/09/2015 03/10/2015 La Grande Motte France ISPRS OA Annals Article en page(s) : pp 409 - 416 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées
[Termes IGN] base de données localisées
[Termes IGN] données localisées
[Termes IGN] Paris (75)
[Termes IGN] procédure opérationnelle
[Termes IGN] reconstruction de route
[Termes IGN] réseau routier
[Termes IGN] système de gestion de bases de données relationnelles
[Termes IGN] zone tamponMots-clés libres : StreetGen, Street Modeling, RDBMS, Road Network, GIS database, kinetic hypothesys, Variable Buffer Résumé : (auteur) Streets are large, diverse, and used for conflicting transport modalities as well as social and cultural activities. Proper planning is essential and requires data. Manually fabricating data that represent streets (street reconstruction) is error-prone and time consuming. Automatising street reconstruction is a challenge because of the diversity, size, and scale of the details (~ cm for cornerstone) required. The state-of-the-art focuses on roads and is strongly oriented by each application (simulation, visualisation, planning). We propose a unified framework that works on real Geographic Information System (GIS) data and uses a strong, yet simple hypothesis when possible to produce coherent street modelling at the city scale or street scale. Because it is updated only locally in subsequent computing, the result can be improved by adapting input data and the parameters of the model. We reconstruct the entire Paris streets in a few minutes and show how the results can be edited simultaneously by several concurrent users. Numéro de notice : A2015--051 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.5194/isprsannals-II-3-W5-409-2015 Date de publication en ligne : 20/08/2015 En ligne : http://dx.doi.org/10.5194/isprsannals-II-3-W5-409-2015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82689
in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences > vol II-3 W5 (October 2015) . - pp 409 - 416[article]An integrated heterogeneous web service retrieval via combination of instance- and metadata-based schema matching method / Jie He in Geo-spatial Information Science, vol 18 n° 2 (August 2015)
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Titre : An integrated heterogeneous web service retrieval via combination of instance- and metadata-based schema matching method Type de document : Article/Communication Auteurs : Jie He, Auteur ; Wei Wang, Auteur Année de publication : 2015 Article en page(s) : pp 111 - 123 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web
[Termes IGN] appariement de données localisées
[Termes IGN] GeoServer
[Termes IGN] instance
[Termes IGN] métadonnées
[Termes IGN] métadonnées géographiques
[Termes IGN] Web Coverage Service
[Termes IGN] Web Feature ServiceRésumé : (auteur) Schema matching is a critical step in the integration of heterogeneous web service, which contains various types of web services and multi-version services of the same type. Mapping loss or mismatch usually occurs due to schema differences in structure and content and the variety in concept definition and organization. Current instance schema matching methods are not mature enough for heterogeneous web service because they cannot deal with the instance data in web service domain and capture all the semantics, especially metadata semantics. The metadata-based and the instance-based matching methods, in the case of being employed individually, are not efficient to determine the concept relationships, which are crucial for finding high-quality matches between schema attributes. In this paper, we propose an improved schema matching method, based on the combination of instance and metadata (CIM) matcher. The main method of our approach is to utilize schema structure, element labels, and the corresponding instance data information. The matching process is divided into two phases. In the first phase, the metadata-based matchers are used to compute the element label similarity of multi-version open geospatial consortium web service schema, and the generated matching results are raw mappings, which will be reused in the next instance matching phase. In the second phase, the designed instance matching algorithms are employed to the instance data of the raw mappings and fine mappings are generated. Finally, the raw mappings and the fine mappings are combined, and the final mappings are obtained. Our experiments are executed on different versions of web coverage service and web feature service instance data deployed in Geoserver. The results indicate that, the CIM method can obtain more accurate matching results and is flexible enough to handle the web service instance data. Numéro de notice : A2015-761 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/10095020.2015.1065075 En ligne : http://dx.doi.org/10.1080/10095020.2015.1065075 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78797
in Geo-spatial Information Science > vol 18 n° 2 (August 2015) . - pp 111 - 123[article]Discriminating classes of sequential and qualitative colour schemes / Alžběta Brychtová in International journal of cartography, vol 1 n° 1 (August 2015)
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Titre : Discriminating classes of sequential and qualitative colour schemes Type de document : Article/Communication Auteurs : Alžběta Brychtová, Auteur ; Arzu Çöltekin, Auteur Année de publication : 2015 Article en page(s) : pp 62 - 78 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] carte choroplèthe
[Termes IGN] carte polychrome
[Termes IGN] convivialité
[Termes IGN] couleur (rédaction cartographique)
[Termes IGN] lecture de carte
[Termes IGN] lisibilité perceptive
[Termes IGN] oculométrie
[Vedettes matières IGN] CartologieRésumé : (auteur) We present an analysis of the influence of colour distance on the user experience with choropleth and chorochromatic maps. We systematically evaluated five sequential and five qualitative colour schemes in a two-stage user experiment. At first, we conducted an online study to obtain performance metrics accuracy and response time from a large, heterogeneous population. Following this, in a controlled lab study with eye-tracking, we re-examined the findings from the online study for a subset of experimental stimuli and further assessed the user experience through an analysis of their visual behaviour. In this process, along with accuracy and response time, eye-tracking metrics fixation frequency, fixation duration and scanpath speed as well as a gaze transition analysis were utilized. In both experiments, participants were asked to compare two areas with controlled colour distances between them, and decide whether these areas were of the same colour. Results suggest that we are able to discriminate narrower colour distances than commonly used in practice, however, not as narrow as suggested in previous literature. Numéro de notice : A2015-402 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2015.1055643 En ligne : https://doi.org/10.1080/23729333.2015.1055643 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76888
in International journal of cartography > vol 1 n° 1 (August 2015) . - pp 62 - 78[article]Web services for dynamic coloring of UAVSAR images / Jun Wang in Pure and applied geophysics, vol 172 n° 8 (August 2015)PermalinkAutomatic transformation of different levels of detail in 3D GIS city models in CityGML / Yichuan Deng in International journal of 3-D information modeling, vol 4 n° 3 (July - September 2015)PermalinkBeyond the basemap / Matt Toon in GEO: Geoconnexion international, vol 14 n° 7 (July 2015)PermalinkDétermination de la précision planimétrique des images Google Earth haute-résolution de Rome (2ème partie) / Guiseppe Pulighe in Géomatique expert, n° 105 (juillet - août 2015)PermalinkA dimension-independent extrusion algorithm using generalised maps / Ken Arroyo Ohori in International journal of geographical information science IJGIS, vol 29 n° 7 (July 2015)PermalinkFORESTIMATOR : un plugin QGIS d'estimation de la hauteur dominante et du site index de peuplements résineux à partir de Lidar aérien / Laurent Dedry in Revue Française de Photogrammétrie et de Télédétection, n° 211 - 212 (juillet - décembre 2015)PermalinkHier, le Grand Paris / Marc Lemonier in Diagonal, n° 194 (juillet 2015)PermalinkImportance of 3D visualization for land use planning, construction and management of the Karsıyaka settlement area (Izmir-Turkey) / Mehmet Ozcelik in International journal of 3-D information modeling, vol 4 n° 3 (July - September 2015)PermalinkMapping a pollution index for the transboundary Red River Valley, Asia, 2009–2011 / Yongming Xu in Journal of maps, vol 11 n° 3 ([01/07/2015])PermalinkA multicriteria spatial decision support system for solving emergency service station location problems / Majid Esmaelian in International journal of geographical information science IJGIS, vol 29 n° 7 (July 2015)Permalink