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Volunteered geographic information to authoritative databases: linking contributor motivations to program characteristics / David Coleman in Geomatica, vol 64 n° 1 (March 2010)
[article]
Titre : Volunteered geographic information to authoritative databases: linking contributor motivations to program characteristics Type de document : Article/Communication Auteurs : David Coleman, Auteur ; B. Sabone, Auteur ; N. Nkhwanana, Auteur Année de publication : 2010 Article en page(s) : pp 27 - 39 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] analyse comparative
[Termes IGN] base de données thématiques
[Termes IGN] classement
[Termes IGN] données localisées des bénévoles
[Termes IGN] participation du publicRésumé : (Auteur) This paper builds on research by the senior author in reviewing and classifying both VGI contributors and the nature of their contributions. Drawing upon lessons learned in other types of user contribution systems, the authors discuss and propose recommendations as to how a deeper understanding of contributor motivations and the contributions themselves may influence the design of more sustainable re-engineered mapping programs in future. They then use these recommendations to compare and contrast three programs or initiatives driven by volunteered contributions: the State of Victoria's Notification and Editing Service in Australia, the National Map Corps Initiative of the United States Geological Survey, and TomTom's MapShare™ Service. The paper concludes with brief descriptions of related VGI research also currently underway at the University of New Brunswick. Numéro de notice : A2010-263 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/SOCIETE NUMERIQUE Nature : Article DOI : 10.5623/geomat-2010-0004 En ligne : https://cdnsciencepub.com/doi/abs/10.5623/geomat-2010-0004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30457
in Geomatica > vol 64 n° 1 (March 2010) . - pp 27 - 39[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 035-2010011 RAB Revue Centre de documentation En réserve L003 Disponible An intercomparison of simulated rainfall and evapotranspiration associated with a mesoscale convective system over West Africa / Françoise Guichard in Weather and Forecasting, vol 25 n° 1 (February 2010)
[article]
Titre : An intercomparison of simulated rainfall and evapotranspiration associated with a mesoscale convective system over West Africa Type de document : Article/Communication Auteurs : Françoise Guichard, Auteur ; Nicole Asencio, Auteur ; Christophe Peugeot, Auteur ; Olivier Bock , Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Afrique occidentale
[Termes IGN] analyse comparative
[Termes IGN] évapotranspiration
[Termes IGN] modèle de simulation
[Termes IGN] objet meso structurel
[Termes IGN] orage
[Termes IGN] précipitationRésumé : (auteur) An evaluation of precipitation and evapotranspiration simulated by mesoscale models is carried out within the African Monsoon Multidisciplinary Analysis (AMMA) program. Six models performed simulations of a mesoscale convective system (MCS) observed to cross part of West Africa in August 2005.
Initial and boundary conditions are found to significantly control the locations of rainfall at synoptic scales as simulated with either mesoscale or global models. When initialized and forced at their boundaries by the same analysis, all models forecast a westward-moving rainfall structure, as observed by satellite products. However, rainfall is also forecast at other locations where none was observed, and the nighttime northward propagation of rainfall is not well reproduced. There is a wide spread in the rainfall rates across simulations, but also among satellite products.
The range of simulated meridional fluctuations of evapotranspiration (E) appears reasonable, but E displays an overly strong zonal symmetry. Offline land surface modeling and surface energy budget considerations show that errors in the simulated E are not simply related to errors in the surface evaporative fraction, and involve the significant impact of cloud cover on the incoming surface shortwave flux.
The use of higher horizontal resolution (a few km) enhances the variability of precipitation, evapotranspiration, and precipitable water (PW) at the mesoscale. It also leads to a weakening of the daytime precipitation, less evapotranspiration, and smaller PW amounts. The simulated MCS propagates farther northward and somewhat faster within an overall drier atmosphere. These changes are associated with a strengthening of the links between PW and precipitation.Numéro de notice : A2010-645 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1175/2009WAF2222250.1 Date de publication en ligne : 01/02/2010 En ligne : https://doi.org/10.1175/2009WAF2222250.1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90741
in Weather and Forecasting > vol 25 n° 1 (February 2010) . - pp[article]Documents numériques
en open access
An intercomparison of simulated rainfall ... - pdf éditeurAdobe Acrobat PDF Mapping an annual weed with colour-infared aerial photography and image analysis / James H. Everitt in Geocarto international, vol 25 n° 1 (February 2010)
[article]
Titre : Mapping an annual weed with colour-infared aerial photography and image analysis Type de document : Article/Communication Auteurs : James H. Everitt, Auteur ; C. Yang, Auteur ; M.R. Davis, Auteur Année de publication : 2010 Article en page(s) : pp 45 - 52 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] analyse comparative
[Termes IGN] analyse d'image numérique
[Termes IGN] carte de la végétation
[Termes IGN] classification dirigée
[Termes IGN] classification non dirigée
[Termes IGN] image numérisée
[Termes IGN] parcours
[Termes IGN] photographie aérienne
[Termes IGN] photographie en couleur
[Termes IGN] photographie infrarouge
[Termes IGN] surveillance de la végétation
[Termes IGN] Texas (Etats-Unis)Résumé : (Auteur) Silverleaf sunflower (Helianthus argophyllus, Torr and Gray) is an annual weed found on rangelands in south and southeast Texas. Colour-infrared aerial photography and computer image analysis techniques were evaluated for detecting and mapping silverleaf sunflower infestations on a south Texas rangeland area. Supervised and unsupervised image analysis classification techniques were used to classify photographs from two study sites. Supervised classification of the two photographs showed that silverleaf sunflower had mean producer's and user's accuracies of 95.2% and 91.3%, respectively. Unsupervised classification of the two photographs had mean producer's and user's accuracies for silverleaf sunflower of 65.7% and 80.1%, respectively. These results indicate that the supervised technique is superior to the unsupervised technique for mapping silverleaf sunflower infestations using colour-infrared aerial photos. Numéro de notice : A2010-053 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/10106040802677037 Date de publication en ligne : 31/03/2009 En ligne : https://doi.org/10.1080/10106040802677037 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30249
in Geocarto international > vol 25 n° 1 (February 2010) . - pp 45 - 52[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 059-2010011 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Assessing spatial data infrastructures Type de document : Thèse/HDR Auteurs : Lucasz Grus, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 2010 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 76 Importance : 170 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-90-6132-320-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données
[Termes IGN] analyse comparative
[Termes IGN] infrastructure nationale des données localisées
[Termes IGN] qualité des données
[Termes IGN] structure de données localiséesRésumé : (Auteur) Over the last two decades many countries throughout the world have taken steps to establish national Spatial Data Infrastructures (SDls). These actions have sought to provide an infrastructure for accessing and sharing spatial data to reduce the duplication of spatial data collection by both users and producers, and enable better utilization of spatial data and associated services. When developing SDI initiatives it is increasingly important to assess their outcomes in order to justify the resources spent on those infrastructures. Many researchers throughout the world have been struggling with the issue of assessing SDls. The task is difficult due to complex, dynamic and constantly evolving nature of SDI.
The main objective of this thesis is to develop a framework for assessing Spatial Data Infrastructures. This main objective is divided into four sub-objectives: 1. to analyse SDI complexity; 2. to develop a SDI assessment framework; 3. to evaluate the developed SDI assessment framework; 4. to expand the developed SDI Assessment Framework by adding an assessment view for a goal-oriented SDI assessment. Each of these sub-objectives are analyzed in chapters 2 -5.
Chapter 2 analyses SDI complexity by determining whether SDls can be viewed as Complex Adaptive Systems (CAS). This was done by analyzing three NSDI case studies and conducting a survey among SDI experts. First, it was determined if CAS features and behaviours could be found in the three analyzed NSDls. The author searched for the following CAS features and behaviours: 1) features: components, complexity, sensitivity to initial conditions, openness, unpredictability and scale independence; 2) behaviours: adaptability, selforganization, non-linear behaviour, feedback loop mechanism. Second, a survey among SDI experts was conducted by asking them to express their strength of support regarding the presence of CAS features and behaviours in general SDI concept. The results reveal that SDls can be viewed as CAS.
Chapter 3 develops a SDI assessment framework. First, the key SDI characteristics that underlie the problems affecting SDI assessment were identified and analyzed. In order to deal with these problems the principles of assessing Complex Adaptive Systems were identified and discussed. The principles of evaluating Complex Adaptive Systems and norms of general evaluation theory were the basis for developing an assessment framework. The principles of assessing CAS, among others, require that the assessment framework is flexible, contains multiple assessment approaches and uses various methods to determine the indicators' values. The result is the Multi-view SDI assessment framework.
Chapter 4 evaluates the Multi-view SDI assessment framework. The evaluation was based on the pilot application of the framework in 21 National SDIs. The evaluation focused on the process of framework application and framework's applicability to assess SDIs. The process of framework application was evaluated against two criteria: 1) NSDI coordinator response time; 2) Completeness of data. The applicability of the framework to assess SDIs was evaluated by sending a questionnaire to 21 NSDI coordinators. The coordinators were asked for the opinion about the applicability of Multi-view SDI assessment framework application results to assess SDIs. The questionnaire was based on meta-evaluation standard criteria for conducting evaluations (Stufflebeam, 1974; The Joint Committee, 1994). The results showed that the framework could be applied to assess 21 NSDIs. The evaluation of the application process revealed that the completeness of assessment data and time needed to measure indicators depends strongly on the assessment methods used. In addition, the results showed that significant part of the measurements contained missing values. Finally it was demonstrated that the users tend to agree with the general applicability of the Multi-view SDI assessment framework to assess SDIs.
Chapter 5 expands the developed SDI Assessment Framework by adding an assessment view for a goal-oriented SDI assessment. The conceptual foundation of the developed assessment view was a goal-attainment assessment model presented by Hansen (2005). The model seeks to answer the question: to what degree has the goals been realized? The model derives the assessment criteria from goals. To develop a goal-oriented assessment view the author used the Multi-view SDI assessment framework. The developed assessment view was tested by applying it to measure the goals' realization of the Dutch SDI. In addition, the potential users of the goal-oriented assessment view evaluated it. The main result of this chapter is the view for assessing the extent to which SDIs realize their goals. The implementation of the proposed view in the Dutch SDI case demonstrates its potential application. In addition, the evaluation of the proposed view conducted among the potential users confirms its usability and generic character. It is also argued that the precision of definition of SDI goals determines how easy the correct assessment indicators can be found.
Chapter 6 discusses the results of the thesis, presents author's reflections on the main results, and suggests recommendations for the future research. In order to better assess SDIs researchers should look for theories, which could explain and help to understand SDI mechanisms and laws. The results show that viewing SDI as CAS is beneficial for better understanding of SDI assessment principles. As a result, the Multi-view SDI assessment framework is proposed. However, due to the practical reasons it is hypothesized that a fully comprehensive SDI assessment might never be achieved. The reflections on the thesis results lead to several conclusions. Firstly, viewing SDI as CAS, apart from helping to assess SDIs, has also a potential to significantly improve the conceptualization of SDI. Secondly, the proposed Multi-view SDI assessment framework demonstrates the potential value for SDI assessment users acting on all SDI organizational levels. Thirdly, the experience of developing an assessment framework for SDI may also be used in evaluation discipline to further analyze and propose solutions for assessing complex phenomena. Fourthly, the proposed framework has also potential to contribute to an emerging trend of the inter- and transdisciplinary approaches to researching and assessing SDIs. The following recommendations for the future research are made: 1) Analyze the roles that CAS features and behaviours play in SDIs; 2) Focus on developing operational SDI assessment approaches suited to specific user's needs; 3) Analyze the users and their requirements of SDI assessment; 4) Analyze the use of SDI assessment results.Note de contenu : 1. General Introduction
2. Spatial Data Infrastructures as Complex Adaptive Systems
3. Multi-view SDI Assessment Framework
4. Evaluation of the Multi-view SDI Assessment Framework
5. An assessment view to evaluate whether Spatial Data Infrastructures meet their goals
6. General Discussion 123 References
AppendicesNuméro de notice : 10446 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/76Grus.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62445 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10446-01 37.00 Livre Centre de documentation Géomatique Disponible Biais et dérives dans l'altimétrie satellitale à partir de comparaisons avec des marégraphes co-localisés avec des stations GPS / Médéric Gravelle (2010)
Titre : Biais et dérives dans l'altimétrie satellitale à partir de comparaisons avec des marégraphes co-localisés avec des stations GPS Type de document : Mémoire Auteurs : Médéric Gravelle, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2010 Importance : 94 p. Format : 21 x 30 cm Note générale : Bibliographie
Mémoire du Travail de Fin d’Etude, Cycle des Ingénieurs diplômés de l’ENSG 3ème année, [Master PPMD]Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] analyse comparative
[Termes IGN] co-positionnement
[Termes IGN] corrélation
[Termes IGN] détection d'erreur
[Termes IGN] données altimétriques
[Termes IGN] données marégraphiques
[Termes IGN] erreur systématique
[Termes IGN] R (langage)Index. décimale : MPPMD Mémoires du mastère spécialisé Photogrammétrie, Positionnement et Mesures de Déformation Résumé : (Auteur) Dans le contexte actuel de surveillance des océans qui tend vers une océanographie opérationnelle, l'altimétrie satellitale apporte un complément aux mesures des marégraphes, situes sur les zones côtières. Mais la comparaison de ces deux techniques à l'échelle globale est encore un défi, notamment en raison du manque de diffusion de données de rattachement des marégraphes aux stations GPS environnantes, indispensables pour placer les mesures dans un même repère géocentrique, mais aussi pour corriger les observations marégraphiques des mouvements verticaux du socle terrestre sur lequel l'appareil est implante. C'est dans cette optique qu'a vu le jour le projet SONEL (Système d'observation du niveau des eaux littorales) au début des années 2000, visant à collecter, analyser et diffuser les observations de marégraphes français. L'objectif de ce projet de fin d'études est d'élaborer une méthodologie afin de détecter les biais et dérives dans l'altimétrie satellitale à partir de comparaisons avec des marégraphes co-localisés avec des stations GPS. Cela passe dans un premier temps par une participation au développement de SONEL dans le but de constituer un jeu minimal de données sur lesquelles l'étude portera. [...] Note de contenu : Introduction
1 - CONTEXTE
1 - 1 Présentation du site : le laboratoire LIENSs
1 - 1.1 Présentation
1 - 1.2 L'équipe DPL
1 - 1.3 Axe 1 : Niveau marin et mouvements verticaux
1 - 2 Cadre et objectifs
1 - 2.1 Le projet CECILE
1 - 2.2 Le projet SONEL
1 - 2.3 L'altimétrie satellitale
1 - 2.4 Objectifs du stage
1 - 3 Prise en main
1 - 3.1 Le logiciel R
1 - 3.2 Bibliographie
2 Développement de la base de données SONEL
2 - 1 Sources et collecte de données
2 - 1.1 Organismes
2 - 1.2 Les rapports de mission IGN
2 - 2 Intégration dans la base de données
1 - 2.1 Partie Nivellement de la base de données
1 - 2.2 Implémentation
2 - 3 Génération de graphiques
2 - 3.1 Contexte
2 - 3.2 Développement
3 Données et méthode
3 - 1 Données en entrée
3 - 1.1 Données altimétriques
3 - 1.2 Données marégraphiques
3 - 2 Phase d'analyse - Choix des sites
3 - 2.1 Critères de sélection
3 - 2.2 Processus
3 - 2.3 Bilan
3 - 3 Chaine de traitement
3 - 3.1 Format des fichiers
3 - 3.2 Traitement des données marégraphiques
3 - 3.3 Extraction de la série altimétrique
3 - 3.4 Affichage de la différence
4 Résultats
4 - 1 Produits mailles
4 - 1.1 Corrélations
4 - 1.2 Ecart moyen
4 - 1.3 Tendance
4 - 1.4 Transitions
4 - 2 Produits le long de la trace
4 - 2.1 Corrélations
4 - 2.2 Tendances
ConclusionNuméro de notice : 10914 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Mémoire masters divers Organisme de stage : UMR LIENSs Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=49418 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10914-01 MPPMD Livre Centre de documentation Travaux d'élèves Disponible Documents numériques
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