it’s all
in the slopes

  You know the feeling when all seems to be flat, yet you have to work extra hard to maintain your cycling speed?

It’s called faux-plat, or false flat. A small difference in slope percentage makes a big difference on your bike. A 2% slope is hard to see with the bare eye, but requires a lot more energy to overcome than a pancake flat road:

  • cycling takes twice the effort
  • a normal car can use up to 35% more fuel
  • a heavy truck uses up to 40% more fuel


reliable data is absolutely essential.


The Horizontal app uses state-of-the-art topographic data with the highest possible detail.

Where available, we use raw LiDAR derived elevation data, with a vertical error of not more than 15cm. This results in very heavy 3D models, but the outcome is absolutely stunning. We build our topographic models in house, on massive cloud computers, out of billions and billions of survey points.

Based on the topographic model, we calculate the slope of every single street segment in your city.

That’s as detailed as you can get



we map

  And suddenly, mapping is hugely relevant again.

Hans-Ulrich Obrist (Zürich)


Horizontal Cities combines the best of topographic data with entire street networks all over there world. We calculate the slope of all streets. And of all street segments.


Every. Single. Street.

Every 10 meters.

Thousands of kilometers.


(The Comunidad de Madrid, good for a whopping 9.000km² of terrain, has 26.246km of streets. That’s from the north of Norway to Kuala Lumpur and back.)


we map
the world

  A map is the greatest of all epic poems. Its lines and colors show the realization of great dreams.

Gilbert H. Grosvenor, Editor of National Geographic (1903- 1954)



Topographic data being processed by Horizontal Cities
Today we cover 17% of the world’s surface