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The open data HELI-DEM DTM for the western alpine area: computation and publication / L. Biagi in Applied geomatics, vol 8 n° 3-4 (December 2016)  

Public [article]  inApplied geomatics > vol 8 n° 3-4 (December 2016) . - pp 191 - 200 Titre : The open data HELI-DEM DTM for the western alpine area: computation and publication Type de document : Article/Communication Auteurs : L. Biagi, Auteur ; S. Caldera, Auteur ; L. Carcano, Auteur ; Marco Negretti, Auteur Année de publication : 2016 Article en page(s) : pp 191 - 200 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] Alpes [Termes IGN] données altimétriques [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] European Terrestrial Reference Frame [Termes IGN] fusion de données [Termes IGN] Italie [Termes IGN] modèle numérique de surface [Termes IGN] Suisse [Termes IGN] transformation rapide de Fourier Résumé : (Auteur) Two problems can arise in analyzing Digital Elevation Models (DEMs). Firstly, one interest region could be patched by several partly overlapping models that present similar accuracies and spatial resolutions; they should be merged in one unified model. Moreover, even when the interest region is completely covered by one model, local data with better accuracy could cover partial areas and should be properly merged. All these problems have been addressed within Helvetia-Italy Digital Elevation Model, a project funded by the European Regional Development Fund (ERDF). One specific aim of the project was the creation and the publication of a unified DEM for a part of the Alps between Italy and Switzerland. The interest area is prevalently mountainous, with elevations that range from about 200 to 4600 m. Various elevation datasets were available that were gridded with different spatial resolutions, in different reference frames and coordinates. Moreover, one high resolution LiDAR model was available for some areas. Firstly, a validation was performed that allowed the identification of few blunders and confirmed the general accuracy of the input data. Two DEMs have been produced. Both of them cover the whole project area (boundaries λ = 7.80° East and λ = 10.70° East, φ = 45.10° North and φ = 46.70° North) and are gridded in ETRF2000 geographical coordinates, with a spatial resolution of 2 × 10−4 degrees. The former (named HD-1) has been obtained by interpolating and merging all the low resolution models on a new common grid. HD-1 has been locally corrected by the LiDAR model, where it was available; to avoid sharp discontinuities, the corrections have been filtered by Fast Fourier Transform before applying them. The resulting model has been called HD-2. HD-1 and HD-2 are published by an open access geoservice. Numéro de notice : A2016--054 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1007/s12518-016-0176-5 Date de publication en ligne : 26/10/2016 En ligne : http://dx.doi.org/10.1007/s12518-016-0176-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84201 [article]

Improving the monitoring of the status of the environment through web geo-services: the example of large structures supervision / M. Brovelli in Transactions in GIS, vol 15 n° 2 (April 2011)  

Public [article]  inTransactions in GIS > vol 15 n° 2 (April 2011) . - pp 173 - 188 Titre : Improving the monitoring of the status of the environment through web geo-services: the example of large structures supervision Type de document : Article/Communication Auteurs : M. Brovelli, Auteur ; G. Giori, Auteur ; M. Mussin, Auteur ; Marco Negretti, Auteur Année de publication : 2011 Article en page(s) : pp 173 - 188 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] intégration de données [Termes IGN] Lombardie [Termes IGN] projet [Termes IGN] service web géographique [Termes IGN] surveillance d'ouvrage [Termes IGN] travaux publics Résumé : (Auteur) Environmental monitoring is a fundamental process in the design, construction, operation and decommissioning phases of constructing large structures, such as highways, high-speed railways, and airports. Many different actors are involved in these steps: the owner (public or private); the planning, construction, and operation managers; the environmental teams executing the monitoring; the government department or agency responsible for protecting the environment and the health of the population; and, finally, the policy-makers. The environmental agency itself is composed of various domain experts dealing with different environmental arenas (air, water, etc.). Since most of the collected information refers to space and time, GISs are natural tools for storing and processing the data. Nevertheless, instruments, people, and communications technology are involved, and there is a potential for failure, waste of time and unnecessary costs to appear. A web platform based on OGC web services and allowing for sharing and processing the sensor and geographic information can greatly improve workflow management. This article presents a description of a working pilot that can serve as a solution to managing such a project, because it makes it possible to integrate geodata (maps and orthophotos) from different sources and to visualize and analyze the sensor data with respect to both time and space. Numéro de notice : A2011-104 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1111/j.1467-9671.2011.01249.x Date de publication en ligne : 04/04/2011 En ligne : https://doi.org/10.1111/j.1467-9671.2011.01249.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30884 [article]