Show HN: Mapping the most convenient ways to meet someone with public transit

[acavailhez]

Hello!

I built a map that generates a heatmap of the most convenient meeting spots between several people, based on public transit travel times.

Move the markers anywhere in the map; all cities with sufficient transit data are supported!

[ababu6]

I tried to set it near to barcelona and it is not loading, maybe it should warn you if there is not enought data instead of infinite loading

[blindstitch]

This is cool, can you say more about how the routing backend works? Was it difficult getting all this data for transit?