Errors!
This is a small (roughly 2×2 km) area in NW São Paulo. The gappy diagonal line from the lower left corner to the middle right is the SP-021 highway, and the tweets along it seem mostly legit. But the weird double triangle appears to be entirely the tweets of a single user – a very prolific young man who, I speculate, has a broken GPS chip in his phone.
That particular pattern looks like it might be some kind of bit interleaving between latitude and longitude, but that’s sheer guesswork.
While pinning this down, I also discovered that I slightly mis-projected the big version.
Errors!
This is a small (roughly 2×2 km) area in NW São Paulo. The gappy diagonal line from the lower left corner to the middle right is the SP-021 highway, and the tweets along it seem mostly legit. But the weird double triangle appears to be entirely the tweets of a single user – a very prolific young man who, I speculate, has a broken GPS chip in his phone.
That particular pattern looks like it might be some kind of bit interleaving between latitude and longitude, but that’s sheer guesswork.
While pinning this down, I also discovered that I slightly mis-projected the big version.