Abstract
Bayesian phylogeographic analyses are pivotal in reconstructing the spatio-temporal dispersal histories of pathogens. However, interpreting the complex outcomes of phylogeographic reconstructions requires sophisticated visualisation tools. To meet this challenge, we developed spread.gl, an open-source, feature-rich browser application offering a smooth and intuitive visualisation tool for both discrete and continuous phylogeographic inferences, including the animation of pathogen geographic dispersal through time. Spread.gl can render and combine the visualisation of multiple layers that contain information extracted from the input phylogeny and diverse environmental data layers, enabling researchers to explore which environmental factors may have impacted pathogen dispersal patterns before conducting formal testing. We showcase the visualisation features of spread.gl with representative examples, including the smooth animation of a phylogeographic reconstruction based on more than 17,000 SARS-CoV-2 genomic sequences. Source code, installation instructions, example input data, and outputs of spread.gl are accessible at https://github.com/GuyBaele/SpreadGL. Supplementary data are available at Bioinformatics online.
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