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1.
IEEE Trans Vis Comput Graph ; 27(2): 1225-1235, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33048742

RESUMO

Shaded relief is an effective method for visualising terrain on topographic maps, especially when the direction of illumination is adapted locally to emphasise individual terrain features. However, digital shading algorithms are unable to fully match the expressiveness of hand-crafted masterpieces, which are created through a laborious process by highly specialised cartographers. We replicate hand-drawn relief shading using U-Net neural networks. The deep neural networks are trained with manual shaded relief images of the Swiss topographic map series and terrain models of the same area. The networks generate shaded relief that closely resemble hand-drawn shaded relief art. The networks learn essential design principles from manual relief shading such as removing unnecessary terrain details, locally adjusting the illumination direction to accentuate individual terrain features, and varying brightness to emphasise larger landforms. Neural network shadings are generated from digital elevation models in a few seconds, and a study with 18 relief shading experts found that they are of high quality.


Assuntos
Gráficos por Computador , Redes Neurais de Computação , Algoritmos , Estimulação Luminosa
2.
IEEE Trans Vis Comput Graph ; 19(12): 2366-75, 2013 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-24051803

RESUMO

Knowledge about visualization tasks plays an important role in choosing or building suitable visual representations to pursue them. Yet, tasks are a multi-faceted concept and it is thus not surprising that the many existing task taxonomies and models all describe different aspects of tasks, depending on what these task descriptions aim to capture. This results in a clear need to bring these different aspects together under the common hood of a general design space of visualization tasks, which we propose in this paper. Our design space consists of five design dimensions that characterize the main aspects of tasks and that have so far been distributed across different task descriptions. We exemplify its concrete use by applying our design space in the domain of climate impact research. To this end, we propose interfaces to our design space for different user roles (developers, authors, and end users) that allow users of different levels of expertise to work with it.


Assuntos
Algoritmos , Clima , Gráficos por Computador , Design de Software , Software , Interface Usuário-Computador , Simulação por Computador , Modelos Teóricos
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