Centre de documentation
scientifique

Automatic symbolisation methods for geoportals / Ara Toomanian in Cartographic journal (the), vol 49 n° 2 (May 2012)  

Public [article]  inCartographic journal (the) > vol 49 n° 2 (May 2012) . - pp 153 - 163 Titre : Automatic symbolisation methods for geoportals Type de document : Article/Communication Auteurs : Ara Toomanian, Auteur ; Lars Harrie, Auteur ; P. Olsson, Auteur Année de publication : 2012 Article en page(s) : pp 153 - 163 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géomatique web [Termes IGN] carte sur mesure [Termes IGN] couche thématique [Termes IGN] croisement spatial [Termes IGN] géoportail [Termes IGN] infrastructure nationale des données localisées [Termes IGN] saturation de la couleur [Termes IGN] Suède [Termes IGN] symbole graphique [Termes IGN] web mapping Résumé : (Auteur) There is currently a high demand for spatial data usage within web applications. From a technical viewpoint, web services and geoportals aim to fulfil user requirements; however, the current cartographic methods do not satisfy the needs of the end users. The problem is more challenging when the final map contains data from various sources that have various cartographic characteristics; therefore, the vital information might be located under the base map layer. In this paper, we propose the concept of layer priorities as foreground, middle ground or background, and we propose the two following methods to enhance the symbolisation: polygon overlay and colour saturation methods. The results from two case studies show that these methods can satisfy the requirements of the end users. Numéro de notice : A2012-276 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/1743277412Y.0000000002 Date de publication en ligne : 22/11/2013 En ligne : https://doi.org/10.1179/1743277411Y.0000000028 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31722 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-2012021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Methods to improve and evaluate spatial data infrastructures / Ara Toomanian (2012)  

Public Titre : Methods to improve and evaluate spatial data infrastructures Type de document : Thèse/HDR Auteurs : Ara Toomanian, Auteur Editeur : Lund [Suède] : Lund University Année de publication : 2012 Importance : 200 p. Format : 17 x 24 cm ISBN/ISSN/EAN : 978-91-85793-26-6 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes IGN] données localisées [Termes IGN] entrepôt de données localisées [Termes IGN] géoportail [Termes IGN] INSPIRE [Termes IGN] partage de données localisées [Termes IGN] sémiologie graphique [Termes IGN] service web géographique [Termes IGN] service web sémantique Index. décimale : 37.00 Géomatique - information géographique - infrastructure de données Résumé : (auteur) This thesis mainly focuses on methods for improving and evaluating Spatial Data Infrastructures (SDIs). The aim has been threefold: to develop a framework for the management and evaluation of an SDI, to improve the accessibility of spatial data in an SDI, and to improve the cartography in view services in an SDI. Spatial Data Infrastructure has been identified as an umbrella covering spatial data handling procedures. The long - term implementation of SDI increases the need for short/middle term feedbacks from different perspectives. Thus, a precise strategic plan and accurate objectives have to be defined for the implementation of an efficient environment for spatial data collection and exchange in a region. In this thesis, a comprehensive study was conducted to review the current methods in the business management literature to approach to an integrated framework for the implementation and evaluation of SDIs. In this context, four techniques were described and the usability of each technique in several aspects of SDI implementation was discussed. SDI evaluation has been considered as one of the main challenges in recent years. Lack of a general goal oriented framework to assess an SDI from different perspectives was one of the main concerns of this thesis. Among a number of the current methods in this research area, we focused on the Balanced Scorecard (BSC) as a general evaluation framework covering all perspectives in an SDI. The assessment study opened a window to a number of important issues that ranged from the technical to the cartographic aspects of spatial data exchange in an SDI. To access the required datasets in an SDI, clearinghouse networks have been developed as a gateway to the data repositories. However, traditional clearinghouse networks do not satisfy the end user requirements. By adding a number of functionalities, we proposed a methodology to increase the percentage of accessing required data. These methods were based on predefined rules and additional procedures within web processing services and service composition subjects to develop an expert system based clearinghouses. From the cartography viewpoint, current methods for spatial data presentation do not satisfy the user requirements in an SDI environment. The main presentation problem occurs when spatial data are integrated from different sources. For appropriate cartography, we propose a number of methods, such as the polygon overlay method, which is an icon placement approach, to emphasize the more important layers and the color saturation method to decrease the color saturation of the un important layers and emphasize the foreground layer according to the visual hierarchy concept. Another cartographic challenge is the geometrical and topological conflicts in data shown in view services. The geometrical inconsistency is due to the artificial discrepancy that occurs when displaying connected information from different sources, which is caused by inaccuracies and different level s of details in the datasets. The semantic conflict is related to the definition of the related features, i.e., to the information models of the datasets. To overcome these conflicts and to fix the topological and geometric conflicts we use a semantic based expert system by utilizing an automatic cartography core containing a semantic rule based component. We proposed a system architecture that has an OWL (Web Ontology Language) base d expert system to improve the cartography by adjusting and resolving topological and geometrical conflicts in geoportals. Note de contenu : 1- Introduction Numéro de notice : 21323 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Thèse étrangère Note de thèse : Doctoral thesis : Physical Geography : Lund University : 2012 Organisme de stage : Centre for Geographical Information Systems En ligne : http://portal.research.lu.se/portal/en/publications/methods-to-improve-and-evalu [...] Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89992

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21323-01	37.00	Livre	Centre de documentation	Géomatique	Disponible