We have been working on a physically-based world for a while - see this earlier post: Physically Based Earth.
We are at the stage where we are looking for alpha testers to see if we can come up with an alternative to using data controlled by large corporations. The ambition is a 3D world that anyone can contribute to and use.
We can currently create any part of the world from a variety of source (Open Street Map, SRTM, GEBCO) and view and edit that in UE4 in the Editor and at runtime.
Here’s a couple of images of Dublin comparing OSM 3D buildings and our UE4 version.
Message me on here if you are interested and we’ll sort something out.