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I'm trying to reproduce the idea behind this blogpost from Mapbox, but with other data, for example the ne_10m_populated_places_simple dataset from Natural Earth. By adding a z-dimension to the data (eg. the scalerank column, size of city), the idea is to be able to set a height in CartoCSS in Tilemill and get a 3D-representation of the data, with x,y as geo-point and z as value (like in Mapbox's example).

The result could perhaps be something like this (except this map is oblique, different story):

enter image description here

What do I need to do with PostGIS (or other) so that the z-dimension is set for value and correctly converted so I can set the height in CartoCSS?

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