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Qibla, and related, map projections / W. Tobler in Cartography and Geographic Information Science, vol 29 n° 1 (January 2002)  

Public [article]  inCartography and Geographic Information Science > vol 29 n° 1 (January 2002) . - pp 17 - 23 Titre : Qibla, and related, map projections Type de document : Article/Communication Auteurs : W. Tobler, Auteur Année de publication : 2002 Article en page(s) : pp 17 - 23 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] projection [Termes IGN] projection azimutale Résumé : (Auteur) The qibla problem-determination of the direction to Mecca-has given rise to retro-azimuthal map projections, an interesting, albeit unusual and little known, class of map projections. Principal contributors to this subject were Craig and Hammer, both writing in 1910. A property of retro-azimuthal projections is that the parallels are bent downwards towards the equator. The resulting maps, when extended to the entire world, thus must overlap themselves. An unusual recent discovery from Iran suggests that Muslims might have been prior inventors of a similar projection, by at least several centuries. A later corollary by Schoy leads to a new "cylindrical" azimuthal map projection with parallels bending away from the equator, here illustrated for the first time. Numéro de notice : A2002-047 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1559/152304002782064574 En ligne : https://doi.org/10.1559/152304002782064574 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21964 [article]

Exemplaires(1)

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032-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

An elevation of fractal methods for characterizing image complexity / Nina S.N. Lam in Cartography and Geographic Information Science, vol 29 n° 1 (January 2002)  

Public [article]  inCartography and Geographic Information Science > vol 29 n° 1 (January 2002) . - pp 25 - 35 Titre : An elevation of fractal methods for characterizing image complexity Type de document : Article/Communication Auteurs : Nina S.N. Lam, Auteur ; H.L. Qiu, Auteur ; et al., Auteur Année de publication : 2002 Article en page(s) : pp 25 - 35 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] autocorrélation spatiale [Termes IGN] complexité [Termes IGN] dimension fractale [Termes IGN] exploration de données [Termes IGN] objet fractal [Termes IGN] simulation de surface Résumé : (Auteur) Previously, we developed an integrated software package called ICAMS (Image Characterization and Modeling System) to provide specialized spatial analytical functions for interpreting remote sensing data. This paper evaluates three fractal dimension measurement methods that have been implemented in ICAMS: isarithm, variogram, and a modified version of triangular prism. To provide insights into how the fractal methods compare with conventional spatial techniques in measuring landscape complexity, the performance of two spatial autocorrelation methods, Moran's 1 and Geary's C, is also evaluated. Results from analyzing 25 simulated surfaces having known fractal dimensions show that both the isarithm and triangular prism methods can accurately measure a range of fractal surfaces. The triangular prism method is most accurate at estimating the fractal dimension of surfaces having higher spatial complexity, but it is sensitive to contrast stretching. The variogram method is a comparatively poor estimator for all surfaces, particularly those with high tractor dimensions. As with the fractal techniques, spatial autocorrelation techniques have been found to be useful for measuring complex images, but not images with low dimensionality. Fractal measurement methods, as well as spatial autocorrelation techniques, can be applied directly to unclassified images and could serve as a tool for change detection and data mining. Numéro de notice : A2002-048 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1559/152304002782064600 En ligne : https://doi.org/10.1559/152304002782064600 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21965 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible

An inverse solution to the Winkel Tripel projection using partial derivatives / Cengizhan Ipbuker in Cartography and Geographic Information Science, vol 29 n° 1 (January 2002)  

Public [article]  inCartography and Geographic Information Science > vol 29 n° 1 (January 2002) . - pp 37 - 42 Titre : An inverse solution to the Winkel Tripel projection using partial derivatives Type de document : Article/Communication Auteurs : Cengizhan Ipbuker, Auteur Année de publication : 2002 Article en page(s) : pp 37 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] Projection de Winkel-Tripel Résumé : (Auteur) In cartographic applications it is frequently necessary to transform the rectangular coordinates from one projection into another. In this case, one must first calculate the geographical coordinates from the rectangular coordinates of the existing map and then project these new geo-graphical coordinates to the desired projection. This is called an inverse solution. If both of the plane coordinates are functions of the variables longitude and latitude, it may not be easy to derive the geographical coordinates. This paper describes an iterative approach for the inverse solution of the Winkel Tripel projection using partial derivatives. I chose the Winkel Tripel projection because it is commonly used for mapping the whole world. It has a special importance in atlas cartography where it is regarded as a suitable projection with relatively little distortion, distributed more uniformly than many other atlas projections. Numéro de notice : A2002-049 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1559/152304002782064619 En ligne : https://doi.org/10.1559/152304002782064619 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=21966 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
032-02011	RAB	Revue	Centre de documentation	En réserve L003	Disponible