Stumbled across indie pixels mapbox tutorial. This is part of the Game Dev Toolkit. Need to sign up for a free account at mapbox.com .

It’s quick, fast, accurate (much tighter lineup in 3DE), gets height map, satellite image for base colour and osm street data.

How far you zoom will affect the resolution of satellite data. Here the zoom level is 13.

4 pieces. Each piece is a 2048x2048 heightfield with 4 million voxels. Bloody dense. Needs optimization.