Adaptive Composite Map Projections

Jenny, Bernhard

doi:10.1109/tvcg.2012.192

Cited by 43 publications

(18 citation statements)

References 25 publications

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“…The real-time projection of web maps is relevant at various map scales, because it offers two main advantages: (1) the map can automatically adjust its projection to minimize distortion for the currently visible area and (2) the map center can be adjusted, either by the user or algorithmically (Jenny, 2012;. The projection of a video requires each movie frame to be transformed.…”

Section: Real-time Projection Of Georeferenced Videomentioning

confidence: 99%

Interactive video maps: A year in the life of Earth's CO₂

et al. 2016

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This article introduces interactive video maps for the web. The main component of video maps is a video stream that is areally georeferenced to a spatial reference system in the same way rectified raster orthoimages are georeferenced. The areal georeference allows for interactivity that goes beyond the play, pause, and stop functionality of video player software. We highlight two types of functionality, allowing the user to (1) combine the video stream layer with other raster and vector map layers and (2) adjust the projection of the map in real time. We exemplify video maps by A Year in the Life of Earth's CO 2 , an interactive video map that visualizes the results of a high-resolution NASA computer model of global atmospheric carbon dioxide distribution. The map shows how carbon dioxide travels around the globe over the course of one year. We use a combination of WebGL, a programming interface to the hardware-accelerated graphics pipeline, and HTML5 video for adding an areally georeferenced video layer to other map layers, and for the on the fly projection of the video stream in the web browser.ARTICLE HISTORY

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Section: Real-time Projection Of Georeferenced Videomentioning

confidence: 99%

Interactive video maps: A year in the life of Earth's CO₂

et al. 2016

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“…We show the result of the deformation of a regular grid as is common in geographical map projections (e.g. [26]). Since grids have a regular structure, they can be used as a reference to understand what was deformed and how (See Figs.…”

Section: Visual Designmentioning

confidence: 99%

Visual Encoding of Dissimilarity Data via Topology-Preserving Map Deformation

Bouts

Dwyer

Dykes

et al. 2016

IEEE Trans. Visual. Comput. Graphics

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This is the accepted version of the paper.This version of the publication may differ from the final published version. Abstract-We present an efficient technique for topology-preserving map deformation and apply it to the visualization of dissimilarity data in a geographic context. Map deformation techniques such as value-by-area cartograms are well studied. However, using deformation to highlight (dis)similarity between locations on a map in terms of their underlying data attributes is novel. We also identify an alternative way to represent dissimilarities on a map through the use of visual overlays. These overlays are complementary to deformation techniques and enable us to assess the quality of the deformation as well as to explore the design space of blending the two methods. Finally, we demonstrate how these techniques can be useful in several-quite different-applied contexts: travel-time visualization, social demographics research and understanding energy flowing in a wide-area power-grid. Permanent repository link

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“…Can these projections be incorporated into the base Web maps to minimize distortion in a seamless way, and is this computationally feasible for systems where millions or billions of maps are served every day? For instance, can we incorporate base maps that respond to user panning and zooming as demonstrated in Jenny's (2012) adaptive composite map projections?…”

Section: Conclusion and Future Research Directionsmentioning

confidence: 99%

Implications of Web Mercator and Its Use in Online Mapping

et al. 2014

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Online interactive maps have become a popular means of communicating with spatial data. In most online mapping systems, Web Mercator has become the dominant projection. While the Mercator projection has a long history of discussion about its inappropriateness for general-purpose mapping, particularly at the global scale, and seems to have been virtually phased out for general-purpose global-scale print maps, it has seen a resurgence in popularity in Web Mercator form. This article theorizes on how Web Mercator came to be widely used for online maps and what this might mean in terms of data display, technical aspects of map generation and distribution, design, and cognition of spatial patterns. The authors emphasize details of where the projection excels and where it does not, as well as some of its advantages and disadvantages for cartographic communication, and conclude with some research directions that may help to develop better solutions to the problem of projections for general-purpose, multi-scale Web mapping. RÉSUMÉLes cartes interactives en ligne sont devenues un moyen populaire de communiquer au moyen de données spatiales. Dans la plupart des systèmes de cartographie en ligne, la projection de Mercator sur le Web est devenue la projection dominante. La projection de Mercator soulève depuis longtemps des discussions sur son caractère inapproprié en cartographie générale, particulièrement à l'échelle de la planète, et elle semble avoir à peu près disparu des cartes imprimées à l'échelle mondiale d'usage général, mais on a constaté un regain de popularité de la projection de Mercator sur le Web. Cet article présente une théorie sur la façon dont la projection de Mercator sur le Web s'est généralisée pour les cartes en ligne et sur ce que cela pourrait signifier pour l'affichage des données, les aspects techniques de la production et de la distribution de cartes, la conception et la cognition des tendances spatiales. Les auteurs mettent en évidence des détails sur les aspects où la projection excelle et sur ceux où elle n'excelle pas, ainsi que certains de ses avantages et inconvénients pour la communication cartographique. Ils concluent par des pistes de recherche qui peuvent aider à trouver une meilleure solution au problème des projections destinées à la cartographie générale à échelles multiples sur le Web.Mots clés : cartographie en ligne, Mercator sur le Web, projections cartographiques, science SIG, cartographie

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Adaptive Composite Map Projections

Cited by 43 publications

References 25 publications

Interactive video maps: A year in the life of Earth's CO₂

Interactive video maps: A year in the life of Earth's CO₂

Visual Encoding of Dissimilarity Data via Topology-Preserving Map Deformation

Implications of Web Mercator and Its Use in Online Mapping

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Adaptive Composite Map Projections

Cited by 43 publications

References 25 publications

Interactive video maps: A year in the life of Earth's CO2

Interactive video maps: A year in the life of Earth's CO2

Visual Encoding of Dissimilarity Data via Topology-Preserving Map Deformation

Implications of Web Mercator and Its Use in Online Mapping

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Product

Resources

About

Interactive video maps: A year in the life of Earth's CO₂

Interactive video maps: A year in the life of Earth's CO₂