Interestingly, the same patterns happen in Vancouver when downtown near all the highrises: http://labs.strava.com/heatmap/#16/-123.11986/49.28436/gray/bike http

Interestingly, the same patterns happen in Vancouver when downtown near all the highrises: http://labs.strava.com/heatmap/#16/-123.11986/49.28436/gray/bike http://labs.strava.com/heatmap/#16/-123.11986/49.28436/gray/... The noise may well be indirectly tracking building height. ;)