urban planning, ??? is translated as "city cluster", replacing "agglomeration". Megalopolises in China have become the subject of national government planning.

Since, presently, urban data are based on arbitrary definitions that vary from country to country and from year or census to the next, making them difficult to compare, an Urban Metric System (UMS) has been conceived that could correct the problem, since it allows computing the urban area limits and central points, and it can