About Terassikeli

What is Terassikeli?

Terassikeli is a map that shows which terraces are in the sun right now and for how long. You can filter terraces by tap list, price level or cocktails, and scrub time forward to plan the evening.

How is the sun data computed?

For every terrace we compute the sun path and the shadows of the surrounding buildings from open city building data. Street and park tree shadows are estimated from tree registers where available. Cloud cover comes from the hourly forecast, so "sunny now" accounts for the weather.

The model does not know about backyard trees, awnings or parasols, so conditions on site may differ.

Where does the data come from?

Terraces come from the Helsinki terrace permit register and OpenStreetMap. Building heights come from open city data and the National Land Survey of Finland; weather from Open-Meteo. Sources and licenses:

Spotted an error?

The data comes from open registers and is not always up to date. If a terrace is missing or a detail is wrong, vote and comment on its page — it helps everyone else.

Which cities does Terassikeli cover?

All the largest Finnish cities, 302 in total: