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Status of data quality in European national mapping agencies / Antti Jakobsson (2001)  

Public contenu dans Mapping the 21st century: the 20th International Cartographic Conference, ICC 2001, Beijing, China, August 6 - 10, 2001, vol 5. Proceedings / L. Li (2001) Titre : Status of data quality in European national mapping agencies Type de document : Article/Communication Auteurs : Antti Jakobsson, Auteur ; François Vauglin , Auteur Editeur : International Cartographic Association ICA - Association cartographique internationale ACI Année de publication : 2001 Conférence : ICC 2001, 20th International Cartographic Conference ICA, Mapping the 21th century 06/08/2001 10/08/2001 Pékin Chine OA Proceedings Importance : pp 2875 - 2883 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique [Termes IGN] Europe (géographie politique) [Termes IGN] information géographique [Termes IGN] organisme cartographique national [Termes IGN] qualité Résumé : (Auteur) EuroGeographics (formerly CERCO) brings together representatives from the European National Mapping Agencies (NMAs). Its mission is to represent Europe's NMAs and coordinate their efforts to develop the European Geographic Information Infrastructure. It has created several working groups for exchanging information and discussing issues relating to geographical information including the Working Group on Quality. This group is considering three subjects : 'Quality management' and 'ISO 9000', 'Data quality issues and Standards'. The Sub-WorkingGroup on Data Quality (SWG) aims to share experiences in methods used to write dataset specifications, measure quality, assess user requirements and evaluate fitness for use. The SWG used product life cycle as a basis for further study of other issues relating data quality and to prepare a questionnaire based on diffèrent steps in the product life cycle. The questionnaire on data quality was prepared in 1999 and received answers from 18 countries, including the USA. This paper is based on the results of the questionnaire. The questionnaire covered a total of 226 datasets. All NMAs produce topographic datasets and about half also produce cadastral datasets. The questionnaire also covered other datasets produced by the NMAs. The reasons for producing the datasets was divided between legal obligations and market reasons. The user requirements were identified mainly through customer interviews. The specifications and production of the datasets are discussed. Generally, datasets have a product specification, but there is a clear need for standardization. Graphical maps are still considered to be the main source of datasets. NMAs have defined general criteria for quality of datasets, but detailed criteria will be used in the future. Subcontracting the production appears to be quite common. Nearly 75% of the NMAs subcontract part of their production. Surprisingly, cost is not the major reason cited, but rather the acceleration of production. Finally, quality evaluation procedures and data quality issues are discussed. The NMAs recognize the geographic standards are being developed, but evidently some education is needed to evaluate quality. Some quality elements and elements are not well known. Assuring customer of data quality appears to be a major issue. However, quality results are not forwarded to customers, which implies that evaluation procedures are not functioning properly. Current attitudes on quality and the need for proper quality specification indicate the possibility that remaining issues will be solved in the future. Numéro de notice : C2001-014 Affiliation des auteurs : COGIT+Ext (1988-2011) Thématique : GEOMATIQUE Nature : Communication DOI : sans En ligne : https://icaci.org/files/documents/ICC_proceedings/ICC2001/icc2001/file/f20008.pd [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64923

Assessing positional and shape accuracy of polygons in vector GIS / Atef Bel Hadj Ali (2000)

Public contenu dans Accuracy 2000 : Proceedings of the 4th international symposium on spatial accuracy assessment in natural resources and environmental sciences, Amsterdam, July 2000 / Gerard B.M. Heuvelink (2000)  Titre : Assessing positional and shape accuracy of polygons in vector GIS Type de document : Article/Communication Auteurs : Atef Bel Hadj Ali , Auteur ; François Vauglin , Auteur Editeur : Delft : Delft University Press Année de publication : 2000 Conférence : Accuracy 2000, 4th international symposium on spatial accuracy assessment in natural resources and environmental sciences 12/07/2000 14/07/2000 Amsterdam Pays-Bas OA Proceedings Importance : pp 9 - 12 Format : 16 x 24 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] données vectorielles [Termes IGN] évaluation des données [Termes IGN] incertitude de position [Termes IGN] qualité des données Résumé : (auteur) Vector Geographical Information Systems (GIS) use points, limes and polygons to represent the shape and position of spatial information. Classes, attributes and links are use fed to achieve the representation of semantics of spatial information. Assessing accuracy of geographical data sets is obtained by comparing them to data sets of higher accuracy. Such comparison requires efficient matching tools, as do applications working in a multi-source context. Matching algorithms rely on a comparison of spatial information. Some have already been developed and most focus on the matching of points. Some work has been conducted on the matching of lines too. Very few exist on the matching of polygons. This paper proposes new methods for comparing polygonal features in GIS. Numéro de notice : C2000-013 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90094

Less digits for storing coordinates : reducing geographical data without loosing information / François Vauglin in GIM international, vol 13 n° 11 (November 1999)

Public [article]  inGIM international > vol 13 n° 11 (November 1999) . - pp 6 - 9 Titre : Less digits for storing coordinates : reducing geographical data without loosing information Type de document : Article/Communication Auteurs : François Vauglin , Auteur Année de publication : 1999 Article en page(s) : pp 6 - 9 Note générale : Bibliographie 4 ref. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] compression de données [Termes IGN] données localisées [Termes IGN] précision géométrique (imagerie) [Termes IGN] qualité des données [Termes IGN] stockage de données Résumé : (Auteur) Le volume des données dans une BD géographiques vecteur provient des coordonnées des points individuels. Afin d'éviter le gaspillage d'espace informatique, il est important de réfléchir à la quantité de "digits" nécessaire à chacune de ces millions de coordonnées, sans perdre d'information significative. Cet article présente un outil pour une solution simple, entre précision et résolution. Numéro de notice : A1999-119 Affiliation des auteurs : IGN (1940-2011) Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26319 [article]

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Geometrical matching of polygons in GISs and assessment of geometrical quality of polygons / Atef Bel Hadj Ali (1999) 

Public contenu dans Proceedings of the International Symposium on Spatial Data Quality '99, ISSDQ 1999, 18th to 20th March 1999, The Hong Kong Polytechnic University, Hong Kong / Wenzhong Shi (1999) Titre : Geometrical matching of polygons in GISs and assessment of geometrical quality of polygons Type de document : Article/Communication Auteurs : Atef Bel Hadj Ali , Auteur ; François Vauglin , Auteur Editeur : Hong Kong [China] : The Hong Kong Polytechnic University Année de publication : 1999 Conférence : ISSDQ 1999, 1st International Symposium on Spatial Data Quality 18/07/1999 20/07/1999 Hong-Kong Hong-Kong OA Proceedings Importance : pp 33 - 44 Format : 17 x 25 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] appariement automatique [Termes IGN] appariement géométrique [Termes IGN] BD Carto [Termes IGN] BD Topo [Termes IGN] Corine Land Cover [Termes IGN] distance (mathématique) [Termes IGN] indicateur de qualité [Termes IGN] lever cadastral [Termes IGN] polygone [Termes IGN] qualité géométrique (image) Résumé : (auteur) The production of geographic information is a complex process that can not be considered as deterministic because several digitization produce several different data sets. Geographic Information Systems enable the handling of various data, which have to be matched prior to their use. This paper presents a geometric matching algorithm for polygonal surfaces. Our thought process is to handle the surface in itself without focusing on the information about its contour. This algorithm is based on a mathematical distance between polygons. This distance makes it possible to compute two thresholds and a matching table that is defined as a list of polygons from one data set that may be matched to polygons of the other data set. The thresholds are considered as the tuning parameters of this algorithm. They are used to filter the matching table in order to eliminate non-relevant links to produce the matching. The matching process takes into account various cardinality such as 1:1 or 1:n or n:l. Based on the matching table, a quality map of a controlled data set has been produced. This quality assessment is based on a similar measurement of the mathematical distance between polygons. This algorithm has been tested and validated on various data sets, including the land-use layer of French Cartographic Database BDCarto® and Corine Land-Cover Database, or buildings from the French Topographic database BDTopo® and the French Cadaster. This paper presents also the results of these tests. Numéro de notice : C1999-071 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92370

Documents numériques

peut être téléchargé Geometrical matching of polygons ... - scan Adobe Acrobat PDF

A practical study on precision and resolution in vector geographical databases / François Vauglin (1999) 

Public contenu dans Proceedings of the International Symposium on Spatial Data Quality '99, ISSDQ 1999, 18th to 20th March 1999, The Hong Kong Polytechnic University, Hong Kong / Wenzhong Shi (1999) Titre : A practical study on precision and resolution in vector geographical databases Type de document : Article/Communication Auteurs : François Vauglin , Auteur Editeur : Hong Kong [China] : The Hong Kong Polytechnic University Année de publication : 1999 Conférence : ISSDQ 1999, 1st International Symposium on Spatial Data Quality 18/07/1999 20/07/1999 Hong-Kong Hong-Kong OA Proceedings Importance : pp 84 - 94 Format : 17 x 25 cm Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] base de données vectorielles [Termes IGN] BD Carto [Termes IGN] données maillées [Termes IGN] échelle des données [Termes IGN] pouvoir de résolution géométrique [Termes IGN] précision des données [Termes IGN] précision géométrique (imagerie) Résumé : (auteur) Vector geographical databases are designed to represent the world by means of points, lines, polygons, and attributes. This fundamental information is highly structured in most geographical information systems, in which complex concepts like topology can be implemented. This paper describes a study on precision and resolution of vector data. Precision and resolution can be defined easily for raster data or even for classical paper maps. Their definition for digital vector data is presented as a consequence of the corresponding definitions for classical paper maps and as a result of production processes and human perception. Trying to make precision and resolution compatible is then presented as an optimisation issue for geographical databases. A tool providing a simple solution is proposed as well as a classification of the problems that are raised. Numéro de notice : C1999-073 Affiliation des auteurs : COGIT (1988-2011) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92371

Documents numériques

peut être téléchargé A practical study on precision ... pdf auteur Adobe Acrobat PDF

Probability assessments for the use of geometrical metadata / François Vauglin (1999)

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Appariement géométrique de surfaces / François Vauglin in Bulletin d'information de l'Institut géographique national, n° 69 (octobre 1998)

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Description des incertitudes géométriques de l'information géographique / François Vauglin (1998)

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Geometric matching of areas comparison measures and association links / Francis Harvey (1998)

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Statistical representation of relative positional uncertainty / François Vauglin (1998)

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No fuzzy creep! A clustering algorithm for controlling arbitrary node movement / Francis Harvey (07/04/1997)    

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Modèles statistiques des imprécisions géométriques des objets géographiques linéaires / François Vauglin (1997)

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Qualité des données géographiques / François Vauglin (1997)

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Approche probabiliste pour des métadonnées sur la géométrie des objets géographiques / François Vauglin (1995) 

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Journées Recherche 1995, Conception Objet et Généralisation de l'Information Topographique COGIT / Jean-Philippe Lagrange (1995)

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