SRTM

The shuttle radar topography mission was a two week STS mission for creating high-res SAR topography maps of most of earths surface.

Getting SRTM data sets

SAR data sets are a good source if you are interested into making quality 3D terrains for Orbiter.

You can download SRTM data from this location. [1]

SRTM addons

There are currently no addons known, which allow you to recreate the SRT mission.

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