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Optimising 2-parameter Lambert Conformal Conic projections for ground-to-grid distortions / Sergio Baselga in Survey review, Vol 53 n° 380 (September 2021)  

Public [article]  inSurvey review > Vol 53 n° 380 (September 2021) . - pp 415 - 421 Titre : Optimising 2-parameter Lambert Conformal Conic projections for ground-to-grid distortions Type de document : Article/Communication Auteurs : Sergio Baselga, Auteur Année de publication : 2021 Article en page(s) : pp 415 - 421 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] carroyage géographique [Termes IGN] déformation géométrique [Termes IGN] projection conique de Lambert [Termes IGN] projection Universal Transverse Mercator [Termes IGN] transformation inverse Résumé : (auteur) A Lambert Conformal Conic (LCC) projection with two true-scale parallels of latitudes ϕl and ϕu can be recast in a LCC projection with one standard parallel of latitude ϕ0 and scale k0, having the practical advantage that the same type of definition can be used for the two conformal projections universally used: LCC and Transverse Mercator (TM). While equations giving ϕ0 and k0 in terms ϕl and ϕu can be found in the literature, inverse relationships are not readily found. They are derived in the present paper. These may be necessary in views of the planned future definition of the United States State Plane Coordinate System (SPCS) 2022 for the users of particular mapping software requiring to specify the two latitude values instead of the central latitude and central scale. While map projection parameters are customary selected to minimise ellipsoid-to-grid distortions for a region, in some cases it could be more convenient to study and minimise ground-to-grid distortions. Also bearing in mind the design of SPCS 2022, we discuss the advantages and disadvantages of working with each type of distortion definition. Numéro de notice : A2021-638 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2020.1797339 Date de publication en ligne : 28/07/2020 En ligne : https://doi.org/10.1080/00396265.2020.1797339 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98305 [article]

The Equal Earth map projection / Bojan Šavrič in International journal of geographical information science IJGIS, Vol 33 n° 3-4 (March - April 2019)  

Public [article]  inInternational journal of geographical information science IJGIS > Vol 33 n° 3-4 (March - April 2019) . - pp 454 - 465 Titre : The Equal Earth map projection Type de document : Article/Communication Auteurs : Bojan Šavrič, Auteur ; Tom Patterson, Auteur ; Bernhard Jenny, Auteur Année de publication : 2019 Article en page(s) : pp 454 - 465 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] carroyage géographique [Termes IGN] mappemonde [Termes IGN] projection (équivalente) de Mollweide [Termes IGN] projection de Peters [Termes IGN] projection de Robinson [Termes IGN] projection sinusoïdale Résumé : (auteur) The Equal Earth map projection is a new equal-area pseudocylindrical projection for world maps. It is inspired by the widely used Robinson projection, but unlike the Robinson projection, retains the relative size of areas. The projection equations are simple to implement and fast to evaluate. Continental outlines are shown in a visually pleasing and balanced way. Numéro de notice : A2019-023 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/13658816.2018.1504949 Date de publication en ligne : 07/08/2018 En ligne : https://doi.org/10.1080/13658816.2018.1504949 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91951 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-2019031	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-2019032	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Minimum distortion pointed-polar projections for world maps by applying graticule transformation / Janos Gyorffy in International journal of cartography, vol 4 n° 2 (June 2018)  

Public [article]  inInternational journal of cartography > vol 4 n° 2 (June 2018) . - pp 224 - 240 Titre : Minimum distortion pointed-polar projections for world maps by applying graticule transformation Type de document : Article/Communication Auteurs : Janos Gyorffy, Auteur Année de publication : 2018 Article en page(s) : pp 224 - 240 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] carroyage géographique [Termes IGN] planisphère Résumé : (Auteur) Both the media and the geosciences often use small-scale world maps for demonstrating global phenomena. The most important demands on the projection of these maps are: (1) the map distortions have to be reduced as much as possible; (2) the outline shape of the mapped Earth must remind the viewer of the Globe. If the map theme to be illustrated requires neither equivalency (nor, which rarely happens, conformality) nor prescriptions for the map graticule, an aphylactic non-conical projection with simultaneously minimized angular and area distortions is advisable. In this paper, a graticule transformation by a parameterizable function helps to convert minimum distortion pointed-polar pseudocylindrical projections for world maps into general non-conical projections with further minimized distortions. The maximum curvature of the outline shape will be moderated at the same time in order to obtain a definitely pointed-polar character. Numéro de notice : A2018-425 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/23729333.2018.1455263 Date de publication en ligne : 07/05/2018 En ligne : https://doi.org/10.1080/23729333.2018.1455263 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90920 [article]

Graphical design of world map projections / Bernhard Jenny in International journal of geographical information science IJGIS, vol 24 n°11-12 (december 2010)  

Public [article]  inInternational journal of geographical information science IJGIS > vol 24 n°11-12 (december 2010) . - pp 1687 - 1702 Titre : Graphical design of world map projections Type de document : Article/Communication Auteurs : Bernhard Jenny, Auteur ; T. Patterson, Auteur ; Lorenz Hurni, Auteur Année de publication : 2010 Article en page(s) : pp 1687 - 1702 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] application informatique [Termes IGN] carroyage géographique [Termes IGN] déformation géométrique [Termes IGN] logiciel libre [Termes IGN] mappemonde [Termes IGN] projection Résumé : (Auteur) The design of new map projections has up until now required mathematical and cartographic expertise that has limited this activity to a small group of specialists. This article introduces the background mathematics for a software-based method that enables cartographers to easily design new small-scale world map projections. The software is usable even by those without mathematical expertise. A new projection is designed interactively in an iterative process that allows the designer to graphically and numerically assess the graticule, the representation of the continents, and the distortion properties of the new projection. The method has been implemented in Flex Projector, a free and open-source application enabling users to quickly create new map projections and modify existing projections. We also introduce new tools that help evaluate the distortion properties of projections, namely a configurable acceptance index to assess areal and angular distortion, a derived acceptance visualization, and interactive profiles through the distortion space of a projection. To illustrate the proposed method, a new projection, the Cropped Ginzburg VIII projection, is presented. Numéro de notice : A2010-548 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article DOI : 10.1080/13658811003596101 En ligne : https://doi.org/10.1080/13658811003596101 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30740 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
079-2010071	RAB	Revue	Centre de documentation	En réserve L003	Disponible
079-2010072	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Unfolding the Earth: myriahedral projections / J. Van Wijk in Cartographic journal (the), vol 45 n° 1 (February 2008)  

Public [article]  inCartographic journal (the) > vol 45 n° 1 (February 2008) . - pp 32 - 42 Titre : Unfolding the Earth: myriahedral projections Type de document : Article/Communication Auteurs : J. Van Wijk, Auteur Année de publication : 2008 Article en page(s) : pp 32 - 42 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Projections [Termes IGN] carroyage géographique [Termes IGN] planisphère [Termes IGN] polyèdre [Termes IGN] projection équivalente Résumé : (Auteur) Myriahedral projections are a new class of methods for mapping the earth. The globe is projected on a myriahedron, a polyhedron with a very large number of faces. Next, this polyhedron is cut open and unfolded. The resulting maps have a large number of interrupts, but are (almost) conformal and conserve areas. A general approach is presented to decide where to cut the globe, followed by three different types of solution. These follow from the use of meshes based on the standard graticule, the use of recursively subdivided polyhedra and meshes derived from the geography of the earth. A number of examples are presented, including maps for tutorial purposes, optimal foldouts of Platonic solids, and a map of the coastline of the earth. Copyright British Cartographic Society Numéro de notice : A2008-132 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1179/000870408X276594 En ligne : https://doi.org/10.1179/000870408X276594 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29127 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
030-08011	RAB	Revue	Centre de documentation	En réserve L003	Disponible