"Display of spawning changes after a migration"

#PokemonGO: For the past couple of days, I've been analyzing a large dataset of spawns in the Boston area that span the September 26th migration. I've posted a bit of my data exploration / analysis elsewhere.I thought I'd share a graphical view of what happened to spawning location distributions of a couple of select species, before and after a migration.Figure: Bulbasaur, Charmander, Diglett, DratiniFigure: Kabuto, Nidorina, Pikachu, PonytaAs you can see, some species maintain overall similar spawn distribution (e.g., dratini and nidorina). Others go from concentrated hotspots to a more diffuse distribution (e.g., charmander, diglett, kabuto), while others go from diffuse to a more concentrated hotspot (e.g., ponyta).In case you're curious, this analysis is from 286,825 unique spawns (a subset of ~32M spawns kindly shared by /u/nevermyrealname/), with 230,282 of them between Aug 28 and Sep 26, and 56,543 from Sep 26 through Oct 3.Is this information practically useful? Not really, especially as additional data is not currently forthcoming -- but I've been having a blast analyzing the data, seeing what's happening at both micro and macro levels. Incidentally -- if anyone from the SilphRoad research group sees this, I've sent in a request to join your analytical team ;) via /r/TheSilphRoad http://ift.tt/2e5QvQX