@nprofile1q... We used to do something similar to that in the Bay Area, draw a circle around the thing you want to keep (like your current living address) and then plot all the ways to get from there to the potential job. I don't think anyone did a conformal mapping based on time. Sometime people would plot businesses within 'x' miles of their house a potential places to work. But the 'x miles' was a loose indicator of commute time.