SpheriColor: Colormaps for Spherical Geospatial Input Topographies

Authors

Julius Rauscher (University of Konstanz), Johannes Fuchs (University of Konstanz), Daniel A Keim (University of Konstanz), Frederik L. Dennig (University of Konstanz)

Presentation

Session
Form Follows Function
Time
Tuesday, Nov 10, 10:00 – 10:09 (US/Eastern) · session 10:00 – 11:30
Location
Hall Essex north

Keywords

Visual Analytics, Geographic Visualization

Abstract

Multivariate geospatial data visualization often relies on multiple coordinated views, where color can be used to either link views or encode data attributes. Encoding spatial locations through color can reveal patterns in non-spatial visualizations, yet most applications of colormaps focus on high-dimensional attribute encodings instead. While 2D colormaps have been studied extensively, color encodings designed for spherical geospatial data have received much less attention, even though all locations lie on a sphere. To address this, we propose SpheriColor, a colormap generation approach for mapping geospatial references guided by the design goals of distance preservation and colorspace exploitation. We project a geospatial distance function into a perceptually linear colorspace, followed by two different gamut-constrained optimization strategies. We perform a quantitative evaluation using both real-world and synthetic datasets, demonstrating superior performance over 2D colormaps and HSLuv double cone encodings. The simplex-based optimization excels at distance preservation, whereas the ray-based approach provides better colorspace exploitation.

For Practitioners

Data Scientists