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Development of an interoperable tool to facilitate spatial data integration in the contexte of SDI / H. Mohammadi in International journal of geographical information science IJGIS, vol 24 n°3-4 (march 2010)
[article]
Titre : Development of an interoperable tool to facilitate spatial data integration in the contexte of SDI Type de document : Article/Communication Auteurs : H. Mohammadi, Auteur ; Abbas Rajabifard, Auteur ; I.P. Williamson, Auteur Année de publication : 2010 Article en page(s) : pp 487 - 505 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] cohérence des données
[Termes IGN] données multisources
[Termes IGN] infrastructure nationale des données localisées
[Termes IGN] intégration de données
[Termes IGN] interopérabilitéRésumé : (Auteur) The integration of multisource heterogeneous spatial data is one of the major challenges for many spatial data users. To facilitate multisource spatial data integration, many initiatives including federated databases, feature manipulation engines (FMEs), ontology-driven data integration and spatial mediators have been proposed. The major aim of these initiatives is to harmonize data sets and establish interoperability between different data sources.
On the contrary, spatial data integration and interoperability is not a pure technical exercise, and there are other nontechnical issues including institutional, policy, legal and social issues involved. Spatial Data Infrastructure (SDI) framework aims to better address the technical and nontechnical issues and facilitate data integration. The SDIs aim to provide a holistic platform for users to interact with spatial data through technical and nontechnical tools.
This article aims to discuss the complexity of the challenges associated with data integration and propose a tool that facilitates data harmonization through the assessment of multisource spatial data sets against many measures. The measures represent harmonization criteria and are defined based on the requirement of the respective jurisdiction. Information on technical and nontechnical characteristics of spatial data sets is extracted to form metadata and actual data. Then the tool evaluates the characteristics against measures and identifies the items of inconsistency. The tool also proposes available manipulation tools or guidelines to overcome inconsistencies among data sets. The tool can assist practitioners and organizations to avoid the time-consuming and costly process of validating data sets for effective data integration. Copyright Taylor & FrancisNuméro de notice : A2010-145 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810902881903 En ligne : http://dx.doi.org/10.1080/13658810902881903 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30340
in International journal of geographical information science IJGIS > vol 24 n°3-4 (march 2010) . - pp 487 - 505[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010022 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Segmentation and reconstruction of polyhedral building roofs from aerial lidar points clouds / A. Sampath in IEEE Transactions on geoscience and remote sensing, vol 48 n° 3 Tome 2 (March 2010)
[article]
Titre : Segmentation and reconstruction of polyhedral building roofs from aerial lidar points clouds Type de document : Article/Communication Auteurs : A. Sampath, Auteur ; J. Shan, Auteur Année de publication : 2010 Article en page(s) : pp 1554 - 1567 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] analyse de groupement
[Termes IGN] cohérence géométrique
[Termes IGN] détection du bâti
[Termes IGN] diagramme de Voronoï
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] intégrité topologique
[Termes IGN] reconstruction 3D du bâti
[Termes IGN] segmentation
[Termes IGN] semis de points
[Termes IGN] similitude
[Termes IGN] toitRésumé : (Auteur) This paper presents a solution framework for the segmentation and reconstruction of polyhedral building roofs from aerial LIght Detection And Ranging (lidar) point clouds. The eigenanalysis is first carried out for each roof point of a building within its Voronoi neighborhood. Such analysis not only yields the surface normal for each lidar point but also separates the lidar points into planar and nonplanar ones. In the second step, the surface normals of all planar points are clustered with the fuzzy k-means method. To optimize this clustering process, a potential-based approach is used to estimate the number of clusters, while considering both geometry and topology for the cluster similarity. The final step of segmentation separates the parallel and coplanar segments based on their distances and connectivity, respectively. Building reconstruction starts with forming an adjacency matrix that represents the connectivity of the segmented planar segments. A roof interior vertex is determined by intersecting all planar segments that meet at one point, whereas constraints in the form of vertical walls or boundary are applied to determine the vertices on the building outline. Finally, an extended boundary regularization approach is developed based on multiple parallel and perpendicular line pairs to achieve topologically consistent and geometrically correct building models. This paper describes the detail principles and implementation steps for the aforementioned solution framework. Results of a number of buildings with diverse roof complexities are presented and evaluated. Numéro de notice : A2010-272 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2009.2030180 Date de publication en ligne : 03/11/2009 En ligne : https://doi.org/10.1109/TGRS.2009.2030180 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30466
in IEEE Transactions on geoscience and remote sensing > vol 48 n° 3 Tome 2 (March 2010) . - pp 1554 - 1567[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-2010031B RAB Revue Centre de documentation En réserve L003 Disponible Spatial data infrastructures as complex adaptative systems / Lucasz Grus in International journal of geographical information science IJGIS, vol 24 n°3-4 (march 2010)
[article]
Titre : Spatial data infrastructures as complex adaptative systems Type de document : Article/Communication Auteurs : Lucasz Grus, Auteur ; Joep Crompvoets, Auteur ; Arnold K. Bregt, Auteur Année de publication : 2010 Article en page(s) : pp 439 - 463 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] estimation statistique
[Termes IGN] infrastructure nationale des données localisées
[Termes IGN] intégration de données
[Termes IGN] qualité des données
[Termes IGN] système complexeRésumé : (Auteur) Many researchers throughout the world have been struggling to better understand and describe spatial data infrastructures (SDIs). Our knowledge of the real forces and mechanisms behind SDIs is still very limited. The reason for this difficulty might lie in the complex, dynamic and multifaceted nature of SDIs. To evaluate the functioning and effects of SDIs we must have a proper theory and understanding of their nature. This article describes a new approach to understanding SDIs by looking at them through the lens of complex adaptive systems (CASs). CASs are frequently described by the following features and behaviours: complexity, components, self-organization, openness, unpredictability, nonlinearity and adaptability, scale-independence, existence of feedback loop mechanism and sensitivity to initial conditions. In this article both CAS and SDI features are presented, examined and compared using three National SDI case studies from the Netherlands, Australia and Poland. These three National SDIs were carefully analysed to identify CAS features and behaviours. In addition, an Internet survey of SDI experts was carried out to gauge the degree to which they consider SDIs and CASs to be similar. This explorative study provides evidence that to a certain extent SDIs can be viewed as CASs because they have many features in common and behave in a similar way. Studying SDIs as CASs has significant implications for our understanding of SDIs. It will help us to identify and better understand the key factors and conditions for SDI functioning. Assuming that SDIs behave much like CASs, this also has implications for their assessment: assessment techniques typical for linear and predictable systems may not be valid for complex and adaptive systems. This implies that future studies on the development of an SDI assessment framework must consider the complex and adaptive nature of SDIs. Copyright Taylor & Francis Numéro de notice : A2010-144 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810802687319 En ligne : http://dx.doi.org/10.1080/13658810802687319 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30339
in International journal of geographical information science IJGIS > vol 24 n°3-4 (march 2010) . - pp 439 - 463[article]Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-2010022 RAB Revue Centre de documentation En réserve L003 Disponible 079-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Evaluation of Terrasar-X observations for wetland INSAR application / S.H. Hong in IEEE Transactions on geoscience and remote sensing, vol 48 n° 2 (February 2010)
[article]
Titre : Evaluation of Terrasar-X observations for wetland INSAR application Type de document : Article/Communication Auteurs : S.H. Hong, Auteur ; S. Wdowinski, Auteur ; S.W. Kim, Auteur Année de publication : 2010 Article en page(s) : pp 864 - 873 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] bande X
[Termes IGN] cohérence des données
[Termes IGN] Floride (Etats-Unis)
[Termes IGN] image radar moirée
[Termes IGN] image TerraSAR-X
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] marais
[Termes IGN] polarimétrie radarRésumé : (Auteur) This paper assesses the potential of using spaceborne X-band synthetic aperture radar (SAR) data for monitoring water-level changes over wetlands. Our analysis is based on three sets of TerraSAR-X (TSX) observations acquired over South Florida's Everglades wetlands during an eight-month period in 2008. The first set was acquired in single HH polarization stripmap mode over our northern study area, consisting of managed wetlands and urban environments. The second set was acquired in dual-polarization stripmap mode over the western half of the same area, consisting mostly of managed wetlands. The third set was also acquired with dual-polarization stripmap mode over our southern study area, consisting of natural flow freshand salt-water wetlands in the southern Everglades. The first data set was used for a proof-of-concept study to verify that X-band data can generate coherent interferograms in wetland areas. Interferometric processing of this data set shows a high level of coherence (> 0.35) over both wetland and urban regions, maintaining interferometric phase in all three interferograms spanning 11 days. Surprisingly, phase is maintained over some of the wetlands even for interferograms spanning 33 days. The other two data sets were used to evaluate interferometric coherence of all four polarization modes and to determine dominant scattering mechanism in each wetland environment. Our results show high coherence values (> 0.4) in all polarization modes, with highest values in HH, then VV, and lowest in HV or VH. Interferograms calculated from multipolarization data show very similar fringe patterns regardless of the polarization type, suggesting that the phase information in all polarization data reflects water-level changes in wetlands and that volume scattering may be less important than commonly believed. We also used the two multipolarization data sets to conduct the Pauli decomposition, finding a strong dependence of scattering mechanism on vegetation type. The high interferometric coherence level of all polarization data suggests that a significant part of the X-band scattered signal interacts with lower sections of the vegetation (trunks and branches), because scattering from wind-affected canopies cannot support such a high coherence level. The high spatial resolution of TSX, combined with its 11-day repeat orbit, makes this X-band sensor surprisingly suitable for wetland interferometric SAR applications. Copyright IEEE Numéro de notice : A2010-041 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2009.2026895 Date de publication en ligne : 28/08/2009 En ligne : https://doi.org/10.1109/TGRS.2009.2026895 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30237
in IEEE Transactions on geoscience and remote sensing > vol 48 n° 2 (February 2010) . - pp 864 - 873[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 065-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Accuracy 2010 : Proceedings of the Ninth international symposium on spatial accuracy assessment in natural resources and environmental sciences, Leicester, UK, 20 - 23 juillet 2010 / Nicholas J. Tate (2010)
Titre : Accuracy 2010 : Proceedings of the Ninth international symposium on spatial accuracy assessment in natural resources and environmental sciences, Leicester, UK, 20 - 23 juillet 2010 Type de document : Actes de congrès Auteurs : Nicholas J. Tate, Éditeur scientifique ; Peter F. Fisher, Éditeur scientifique Editeur : Leicester [Royaume-Uni] : University of Leicester Année de publication : 2010 Autre Editeur : International Spatial Accuracy Research Association ISARA Conférence : Accuracy 2010, 9th international symposium on spatial accuracy assessment in natural resources and environmental sciences 20/07/2010 23/07/2010 Leicester Royaume-Uni OA Proceedings Importance : 436 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Termes IGN] données localisées des bénévoles
[Termes IGN] géostatistique
[Termes IGN] géovisualisation
[Termes IGN] incertitude des données
[Termes IGN] incertitude géométrique
[Termes IGN] incertitude temporelle
[Termes IGN] précision des données
[Termes IGN] propagation d'erreur
[Termes IGN] sous ensemble flou
[Termes IGN] traitement de données localiséesIndex. décimale : CG2010 Actes de congrès en 2010 Note de contenu : 1 - Keynotes
2 - Remote sensing and image interpretation
3 - Fuzzy uncertainty 1
4 - Uncertainty in space and time
5 - Geostatistics 1
6 - ISPRS session
7 - Uncertainty propagation
8 - Land use and land cover
9 - DEM uncertainty 1
10 - Remote sensing
11 - Geoprocessing
12 - Model uncertainty and validation
13 - Vizualisation
14 - Sampling design
15 - Spatio-temporal uncertainty
16 - DEM uncertainty 2
17 - Geostatistics 2
18 - Fuzzy uncertainty 2
19 - DEM uncertainty 3
20 - Remote sensing classification
21 - Environmental quality
22 - Small area concerns
23 - Ecology and forestry
24 - VGI and web-based geoprocessing
25 - Geocoding and adress coding
26 - PostersNuméro de notice : 21370 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Actes DOI : sans En ligne : http://spatialaccuracy.org/spatial-accuracy-2010/ Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90097 ContientExemplaires(1)
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