A personal reason: I'm building a global simulator for shadows [1]. I started with SRTM based elevation data which allowed me to cast mountain shadows. I'm now

A personal reason: I'm building a global simulator for shadows [1]. I started with SRTM based elevation data which allowed me to cast mountain shadows. I'm now offering some LiDAR data which also includes buildings, structures and trees (~50cm resolution). People use my website for sun mapping their gardens, real estate, farms, events, photography, academic research, solar systems. It would be nice to amp up that resolution by another factor. [1] https://shademap.app https://shademap.app Edit: after reading the article it seems less about surveying the Earth's surface and more about accurate triangulation like GPS :(