This is my entry for Round three of Mapbox’s first annual Map Madness competition. If you’re interested in my entries for my previous rounds, check out:
In Challenge 3, we are adding a 3rd dimension to the Cartogram style we made during Round one. Specifically, we are making our buildings 3D. Every building record in their database has an attribute (think: Excel column) for height. For example, one building might have a height of 20 meters, another 25. Mapbox’s platform uses this height value to extrude, or pull up, the buildings. With extrusion set up on your buildings, you’ll get a 3D effect when you tilt the map’s view point.
I started with the Cartogram style created during Challenge #1. Here is a view of the University of Arizona’s campus, looking west.
Mapbox’s tutorial for Challenge 3 is really the best source for the step by steps. I won’t even try to compete. Instead, how about some tips from my experience?
- Once you open your style to make the edits, publish a 2nd copy of it. That way you’ll have a “before and after” you make your buildings.
- You might already have building filters set up under the “Select data” section that may need to be removed. For example, my style already had an existing “underground” filter that needed to be removed before my “extrude” filter would work.
The Final Product
Below is the Cartogram style with the building extruded from a view of the University of Arizona’s campus, looking west.
Pondering the Results
At first glance, the height of the buildings on campus look awfully uniform to me. That is of course, except for the housing buildings located near Speedway and Park. This could be a sign of inconsistent/incomplete data – which is fairly common. For comparison, I thought I’d take a peek of the same perspective using Google Maps. Below is a screen capture from Google Maps. What do you think?