[Scaevolus]

What's the accuracy/speed tradeoff for thus model compared to one based on computing density points and using Barnes-Hut?

[sphw]

I've never seen anyone use Barnes-Hut for an earth gravity model. I'd be curious to see how an implementation like that would work. I think Barnes-Hut is typically used for large N-body simulations where each particle moves independently, like for galactic simulations.

One of the biggest barriers to alternate geopotential models is the availability of trusted data-sets. In another comment someone linked to a PINN based method that looks super promising