Real terrain data in Unity 3D

The TerrainToolkit is a good tool to create your own imaginary terrain.

1 - What you would do if you want to use real digital terrain elevation model (DEM) with its latitude, longitude and height data in your Unity 3D application?​

There are many sources on internet that large, high resolution terrain data can be obtained. For example, you can download large FSX (Microsoft Flight Simulator X) terrain data from here.

2 - Is there any tool (free or commercial) that loads large terrain data (10s or 100s megabytes) into Unity 3D?
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-Kaya

 

I'd suggest using a program to work with DEMs which can save RAW files, which you can then load into terrain toolkit. I think Terragen can do it.