Well what have I done the past few weeks? Well i created a own terrain system based on this:
The downside is, that I have a infinite artifacts on the lowest terrain height in form of a plane, however this does not matter for me, since it is usually below water, or out of sight.
A look from the side of the Terrain
HighQuality: https://wiki.visiongamestudios.de/wiki/uploads/en/2012/11/ppmt-30152420.png
This is the whole terrain, 16km x 16km with a visible range of around 20km
HighQuality: https://wiki.visiongamestudios.de/wiki/uploads/en/2012/11/49_PM-27164322.png
Ground Quality, closeup
https://wiki.visiongamestudios.de/wiki/uploads/en/2012/11/javaw_2012-11-10_01-34-30-13-10014005.png