So here is finally the data that I needed for my idea: walk directions from A to B while never leaving the shadows, suggesting bars and pubs where to wait while the shadows catch up and let you cross “safely” where before was sunny.

Useful for scorching weather places like south of Spain.

I do a similar game when walking around but the complete inverse. I live in the UK.

You can fool me Dracula

Currently building something like this for my city. One major challenge I've come across so far is that most APIs will give you coordinates for an address of a place within a building but none of the free, paid or crowdsourced options have reliable information on outside seating polygons. Of course, you could always display the places around you with live shadow data on a map, leaving it up to the user to zoom in and decide based on the satellite image whether the restaurant or café offers outside seating. But to plot the route and then suggest nearby sun/shadow seating options to the user, you would need this information.

Would need this, inverted, for winter.