Interactive visualisations

[xoolive]

altair seems a good way to display data, although not great with geographical representations. It is easy to reimplement Flight.plot_time to altair with decent default options. This could be added to the default API.

Another scenario that would be nice to work on would be to the possibility to project trajectories to a 2D space (anything, basic projections, t-SNE, PCA, etc.) and be able by an altair-like selector to come back to a Traffic subset.

[xoolive]

Once altair is implemented, appropriate output can be added to the Traffic widget.
➡️ A new Traffic.widget should be designed...

If a good solution is found for maps as well (Vega/Altair based? d3js based?), then the following dependencies can be removed:

"tornado",  # dependency for matplotlib with WebAgg
"ipympl",  # interactive matplotlib in notebooks

[xoolive]

6de5b79 altair output has been implemented in Flight.chart

[xoolive]

Maybe after all, this could be an extension of the project some day, as an extra library or plugin.