The definition for urban is a grid cell, one kilometre wide, with 1500 people. A "urban centre" is a contiguous collection of urban grid cells that totals at le

The definition for urban is a grid cell, one kilometre wide, with 1500 people. A "urban centre" is a contiguous collection of urban grid cells that totals at least 50 000 people. A city is then the set of municipalities that have at least 50% of their population in that urban centre. I think the article is just summer filler, the results are at least a year old. Here Dijkstra talks about them: https://unhabitat.org/the-tale-of-broadville-and-narrowtown-why-we-need-a-global-people-based-definition-of-cities-and-settlements-lewis-dijkstra/ https://unhabitat.org/the-tale-of-broadville-and-narrowtown-...