Cartography and Geographic Information Science / Cartography and geographic information society . vol 31 n° 4Paru le : 01/10/2004 ISBN/ISSN/EAN : 1523-0406 |
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Ajouter le résultat dans votre panierA new method for the specification of geographic footprints in digital gazetteers / J.P. Wilson in Cartography and Geographic Information Science, vol 31 n° 4 (October 2004)
[article]
Titre : A new method for the specification of geographic footprints in digital gazetteers Type de document : Article/Communication Auteurs : J.P. Wilson, Auteur ; C.S. Lam, Auteur ; D. Holmes-Wong, Auteur Année de publication : 2004 Article en page(s) : pp 195 - 207 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] base de données documentaires
[Termes IGN] base de données localisées
[Termes IGN] bibliothèque numérique
[Termes IGN] cartographie numérique
[Termes IGN] cartographie thématique
[Termes IGN] interactivité
[Termes IGN] logiciel de navigation
[Termes IGN] Los Angeles
[Termes IGN] répertoire toponymique
[Termes IGN] requête spatiotemporelle
[Termes IGN] spécification de produitRésumé : (Auteur) This paper presents the strategy used to add neighborhood names and footprints to Los Angeles Digital Gazeetteer. The Gazetteer database currently contains 4500 features and is needed to : (1) facilitate the specification of footprint in the Qualified Dublin Core metadata records that are used to describe digital assets ; and (2) support the search for and retrieval of select objects based on location, time, format, and/or keyword. The role of the digital gazetteer and a new browser which will offer the library patron a web-based query form with an interactive map is explained. The interface can be used to draw a query on a map, and it provides a series of pull menus that can be used to specify time periods, formats, collections, and keywords of interest. A new method for specifying neighborhood footprints in the digital gazetteer is described in some detail, and opportunities are highlighted for generalizing the method to help with search and retrieval using the map browser. Numéro de notice : A2004-604 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040042742394 En ligne : https://doi.org/10.1559/1523040042742394 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27120
in Cartography and Geographic Information Science > vol 31 n° 4 (October 2004) . - pp 195 - 207[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-04041 RAB Revue Centre de documentation En réserve L003 Disponible The discontinuous nature of kriging interpolation for digital terrain modelling / Thomas H. Meyer in Cartography and Geographic Information Science, vol 31 n° 4 (October 2004)
[article]
Titre : The discontinuous nature of kriging interpolation for digital terrain modelling Type de document : Article/Communication Auteurs : Thomas H. Meyer, Auteur Année de publication : 2004 Article en page(s) : pp 209 - 216 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] discontinuité
[Termes IGN] estimation statistique
[Termes IGN] interpolation inversement proportionnelle à la distance
[Termes IGN] interpolation spatiale
[Termes IGN] krigeage
[Termes IGN] modèle numérique de terrain
[Termes IGN] variogrammeRésumé : (Auteur) Kriging is a widely employed method for interpolating and estimating elevations from digital elevation data. Its place of prominence is due to its elegant theoretical foundation and its convenient practical implementation. From an interpolation point of view, kriging is equivalent to a thin -plate spline and is one species among the many in the genus of weighted inverse distance methods, albeit with attractive properties. However, from a statistical point of view, kriging is a best linear unbiased estimator and, consequently, has a place of distinction among all spatial estimators because any other linear estimator that performs as well as kriging ( in the least squares sense) must be equivalent to kriging, assuming that the parmeters of the semivariogram are known. Therefore, kriging is often held to be gold standard of digital terrain model estimation. However, i prove that, when used with local support, kriging creates discontinuous digital terrain models, which is to say, surfaces with "rips" and "tears" throughout them. This results is generaly ; it is true for ordinary kriging with a trend, and other forms. A U.S. Geological Survey (USGS) digital elevation model was analyzed to characterize the distribution of the discontinuities. I show that the magnitude of the discontinuity does not depend on surface gradient but is strongly dependant on the size of the kriging neighborhood. Numéro de notice : A2004-605 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1559/1523040042742385 En ligne : https://doi.org/10.1559/1523040042742385 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27121
in Cartography and Geographic Information Science > vol 31 n° 4 (October 2004) . - pp 209 - 216[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-04041 RAB Revue Centre de documentation En réserve L003 Disponible Frequency histogram legend in the choropleth map: a substitute to traditional legends / N. Kumar in Cartography and Geographic Information Science, vol 31 n° 4 (October 2004)
[article]
Titre : Frequency histogram legend in the choropleth map: a substitute to traditional legends Type de document : Article/Communication Auteurs : N. Kumar, Auteur Année de publication : 2004 Article en page(s) : pp 217 - 236 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] ArcInfo
[Termes IGN] carte choroplèthe
[Termes IGN] cartographie statistique
[Termes IGN] classe de précision
[Termes IGN] distribution de Gauss
[Termes IGN] histogramme
[Termes IGN] légende cartographique
[Termes IGN] lisibilité perceptive
[Termes IGN] utilisateur
[Termes IGN] visualisationRésumé : (Auteur) This article presents the use of the frequency histogram legend (FHL) as a substitute to traditional legends in both classed and unclassed maps. Great variation in the size of mapping units can hinder reader's ability to comprehend statistical distributions from a choropleth map. Replacing conventional legends with FHL can aid readers i their understanding of spatial as well as statistical distributions of the mapped data sumultaneously. A custumized mapping application was designed in ArcInfo 9.0 to test the use of FHL in both classed and unclassed choropleth maps. Frequency histogram legends were tested on different types of statistical distributions. although the comparison of the results show that the FHL works best for a Gaussian or close to a gaussian distribution for eight or fewer classes, the customuzed application permits users to generate choropleth maps with frequency histogram legends for any type of statistical distribution with any number of classes. The analysis reveals that reader's background in statistic helped them to effectively utilize and interpret frequency histogram legends in the choropleth maps. Numéro de notice : A2004-606 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040042742411 En ligne : https://doi.org/10.1559/1523040042742411 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27122
in Cartography and Geographic Information Science > vol 31 n° 4 (October 2004) . - pp 217 - 236[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-04041 RAB Revue Centre de documentation En réserve L003 Disponible The distance-similarity metaphor in network-display spatialisations / Sara Irina Fabrikant in Cartography and Geographic Information Science, vol 31 n° 4 (October 2004)
[article]
Titre : The distance-similarity metaphor in network-display spatialisations Type de document : Article/Communication Auteurs : Sara Irina Fabrikant, Auteur ; Daniel R. Montello, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 237 - 252 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Cartographie numérique
[Termes IGN] découverte de connaissances
[Termes IGN] distance
[Termes IGN] réseau
[Termes IGN] similitude
[Termes IGN] variable visuelle
[Termes IGN] visualisation de donnéesRésumé : (Auteur) Dimensionality reduction algorithms are applied in the field of information visualization to generate low-dimensional, visuo-spatial displays of complex multivariate databases - spatializations. Most popular dimensionality reducting algorithms projects relatedness in data content among entities in an information space (e.g., semantic similarity) onto some form of distanceamong the entities, such that semantically similar documents are placed closer to one another than less similar ones. In previous studies of point-display spatializations, we have shown that people indeed associate metric straight-line inter-point distances with the semantic dissimilarity of documents depicted as points in two-dimensional space. In this paper, we investigated the strategies viewers employ when conflicting notions of distance (straight-line metric vs. topological proximity) are jointly shown in a spatialized network display or reuters news articles depicted as points connected by links. We report empirical results of an experiment where viewers are asked to assess document similarity, depending on various distance types. We also investigate how cartographic symbolization principles (the use of visual variables such as size, color hue, and value) influence similarity judgments. These findings provide rare empirical evidence for generally accepted design practices within the cartographic community (e.g., the effects of visual variables). in addition, empirical results from this and related studies can be used to develop design guidelines for constructing cognitively adequate spatializations for knowledge discovery in very large databases. We conclude by presenting design guidelines for network spatializations within the context of cartographic practice and theory. Numéro de notice : A2004-607 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1559/1523040042742402 En ligne : https://doi.org/10.1559/1523040042742402 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27123
in Cartography and Geographic Information Science > vol 31 n° 4 (October 2004) . - pp 237 - 252[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 032-04041 RAB Revue Centre de documentation En réserve L003 Disponible