[acemarke]

It says "contact us" and links to their sales email, so I'd assume the dataset is available for purchase. Based on the costs for their satellite imagery dataset [0], I'd assume it's reasonably priced.

I actually self-generated an entire worldwide Cesium quantized-mesh terrain dataset myself a few months ago, based on the ALOS30 terrain dataset [1]. As a prerequisite, I modified the open-source `cesium-terrain-builder` tool to support writing output to MBTiles files [2].

I've been wanting to write a blog post about the process, but have had too many other things on my todo list. Also, it's probably simpler to just purchase whatever they've got available. Still, if you've got questions, be happy to try to answer them.

[0] https://openmaptiles.com/downloads/tileset/satellite/

[1] http://www.eorc.jaxa.jp/ALOS/en/aw3d30/index.htm

[2] https://github.com/geo-data/cesium-terrain-builder/pull/61