Pop you later
Oh, too bad if you're not a city planner. I'm on a roll.
Floor area ratio is calculated by taking the total floor area of buildings and dividing by the land area of the lot they are built on.
Employment density is the number of jobs in any given area.
Gross density is any density figure for a given area of land that include uses not directly relevant to the figure.
Nett density is a density figure for a given area of land that excludes land not directly related to the figure.
Weighted density. I feel the weight of destiny requiring my services elsewhere when it comes time to describe that.