[jandrewrogers]

Graph reconstruction from space-time event data goes far beyond the above in terms of capability. You can infer relationships between people that never co-travel, infer that people have been places that are not in the event data, etc by stitching together large numbers of orthogonal event streams over long periods of time. It is straightforward to distinguish between various modes of transit analytically. The "metadata" that simply indicates an event in space-time is far more valuable analytically than the data because it is possible to reconstruct so much with it that isn't contained within the data per se.

I was doing all of this five years ago, the capability has been around for a while.

[pjc50]

Do you ever worry that this data might be used for bad purposes?