I like it and this is cool to see. I have a Certificate in GIS and did some reading at one time about the inherent challenges involved in dealing with time in d

I like it and this is cool to see. I have a Certificate in GIS and did some reading at one time about the inherent challenges involved in dealing with time in data visualization. This seems to be a fairly elegant solution. In city centers with a lot of walking traffic, you may see maps overlaid with progressively larger circles, to estimate travel time based on simple physical distance. But this assumes that people move like crows fly: that there’s a straight-line road for anywhere we want to go, through concrete walls and over lakes, without traffic ever to slow us down. In an urban setting, none of these are practical assumptions to make. That isn't limited to urban settings. They are not practical assumptions to make in any setting.