[jordonwii]

They mentioned it off-hand once:

> For Android phones, the information we use in addition to satellite signal strengths is usually just the standard GNSS position fix, but can also be Android Fused locations, which may include WiFi-based positioning. Since this location can be very inaccurate, single time instant (one-shot) fusion of GNSS fix with shadow matching likelihoods typically leads to poor performance.

I was thinking the same thing you were. I wonder why they found that it worked poorly for them.