1. RWT can generate much more detailed terrains and textures.
But Online Maps can generate this runtime, and the result will use much less memory.
So here you choose what you need - quality or runtime.

2. https://forum.infinity-code.com/viewtopic.php?id=808

3. Unfortunately, I did not understand this question.
Please rephrase this.

4. A screenshot is attached.

I am now looking at such ways to stream in real world data and came across Online Maps.

So my questions are:

1) Is the satellite and Elevation data as good as Real World Terrain, or what is the maximum?

2) The "Flight Sim Video" shows a very short distance to the horizon, can this be extended?

3) Are the tiles terrain objects?

4) Do you have any examples, videos or screenshots of a mountain area showing Textures and elevation?

Thank you
Andy