Relationship between Yahi and PSI
If you make use of this data then I'd love to know what you're doing with it, please drop me a line.
Errors and Format Changes
Data prior to about October 2014 is likely to contain location errors. In particular, early samples for any given sensor are likely to be at HackerspaceSG rather than at the location indicated. If I do make corrections to historical data then I'll announce this on the yahi-announce mailing list which I'd suggest you join.
I am also likely to make format changes at some point. These will also be announced on yahi-announce.