Over the past few days, I’ve jumped into the Mapzen/Tangram ecosystem. First impressions: somewhat steep learning curve to grasp YAML format, lighting options are pretty neat, very fast to render GeoJSON, documentation is good although asks a lot of the newbie reader, the provided Mapzen Vector Tile Service (mostly OSM) is awesome, and I bet shaders are cool, but I don’t understand them (yet).
My example is largely based off the Mapzen JS Walkthrough, with a few simple additional wrinkles. I draw parcel geometry and attribute data directly from Open Data Prince George. I take building data from the same source, remove OSM buildings from the scene, and draw/extrude 3D buildings based on the building height attribute.