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Ten years of technology advancement in remote sensing and the research in the CRC-AGIP in GCE / Y. Zhang in Geomatica, vol 64 n° 2 (June 2010)  

Public [article]  inGeomatica > vol 64 n° 2 (June 2010) . - pp 173 - 189 Titre : Ten years of technology advancement in remote sensing and the research in the CRC-AGIP in GCE Type de document : Article/Communication Auteurs : Y. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp 173 - 189 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] capteur imageur [Termes IGN] capteur non-imageur [Termes IGN] cartographie par internet [Termes IGN] extraction automatique [Termes IGN] instrument aéroporté [Termes IGN] télédétection aérienne [Termes IGN] télédétection spatiale [Termes IGN] traitement d'image Résumé : (Auteur) This paper briefly reviews the development of remote sensing technologies in the last ten years, including the development of optical, radar, and laser sensors and the trend of remote sensing software development. It also introduces some of the research activities and achievements of the Canada Research Chair Laboratory in Advanced Geomatics Image Processing (CRC-AGIP Lab) in the Department of Geodesy and Geomatics Engineering (GGE) at the University of New Brunswick (UNB). According to literature review and our research experience, we have concluded that the “bottle neck” of remote sensing is still the lack of software tools for effective information extraction from remote sensing data, especially after the rapid advancement of remote sensing sensor technologies in the last ten years and the increased demand for quickly updated, accurate geo-spatial information. Numéro de notice : A2010-386 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.5623/geomat-2010-0019 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2010-0019 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30580 [article]

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The potential and early limitations of volunteered geographic information / David Coleman in Geomatica, vol 64 n° 2 (June 2010)  

Public [article]  inGeomatica > vol 64 n° 2 (June 2010) . - pp 209 - 219 Titre : The potential and early limitations of volunteered geographic information Type de document : Article/Communication Auteurs : David Coleman, Auteur Année de publication : 2010 Article en page(s) : pp 209 - 219 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] cartographie par internet [Termes IGN] diffusion de données [Termes IGN] données localisées des bénévoles [Termes IGN] géopositionnement [Termes IGN] logiciel de cartographie [Termes IGN] partage de données localisées [Termes IGN] transmission de données Résumé : (Auteur) Advances in personal positioning, Web mapping, cellular communications and wiki technologies have surpassed the original visions of the architects of mapping and spatial data infrastructure programs around the world. Using GPS-enabled cellphones and personal navigation systems, people can and do share location information describing points of interest, places visited, recent construction and corrections to out-of-date feature attributes. By tapping the distributed knowledge, personal time and energy of volunteer contributors, geographic information (GI) voluntarism has the potential to relocate and redistribute selected GI productive activities from mapping agencies to networks of non-state volunteer actors. However, if we are to design strategies and systems to maximize its advantages and minimize the risks to authoritative mapping programs, we must have a clear understanding of the people and technologies involved. This paper describes a program of research led by the author which examines the risks and opportunities created by the emergence of Volunteered Geographic Information (VGI) as a viable means of updating and enriching authoritative geographic information databases maintained by public and private sector providers. After briefly summarizing early research into the nature and motivation of contributors, the author describes early empirical accuracy testing results and important questions to be posed by authoritative data providers when considering VGI as a source of data updates. Numéro de notice : A2010-387 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.5623/geomat-2010-0021 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2010-0021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30581 [article]

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035-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Can mean values of Helmert's gravity anomalies be continued downward directly? / Petr Vanicek in Geomatica, vol 64 n° 2 (June 2010)  

Public [article]  inGeomatica > vol 64 n° 2 (June 2010) . - pp 245 - 251 Titre : Can mean values of Helmert's gravity anomalies be continued downward directly? Type de document : Article/Communication Auteurs : Petr Vanicek, Auteur ; Marcelo C. Santos, Auteur Année de publication : 2010 Article en page(s) : pp 245 - 251 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] géoïde gravimétrique [Termes IGN] problème des valeurs limites [Termes IGN] problème inverse [Termes IGN] valeur moyenne Résumé : (Auteur) The computation of a precise gravimetric geoid based on the Stokes-Helmert approach requires the solution of the geodetic boundary value problem. For that, the mean Helmert’s gravity anomaly on the earth’s topographic surface must be reduced to the geoid, the surface that plays the role of the boundary. This reduction is a process known as downward continuation. This paper considers the downward continuation as a solution of the discrete inverse Poisson problem. It shows the derivation of a doubly-averaged upward continuation operator that relates mean Helmert’s gravity anomaly from the boundary to the surface. Downward continuation is then carried out by the inversion of this operator. It is shown that this can be done rigorously if, and only if, the processes of averaging and downward continuation are commutative (mutually interchangeable). Numéro de notice : A2010-388 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5623/geomat-2010-0024 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2010-0024 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30582 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
035-2010021	RAB	Revue	Centre de documentation	En réserve L003	Disponible