...
- "Population value known": for this, it is assumed the attribute table of the administrative unit shapefile has a column informing about the official number of population in each administrative unit. AccessMod will therefore ensure, in each administrative unit, that the population redistributed outside barriers sum up to the official population number of that unit. Note that this option can also be used when one simply want to correct the whole population by a factor (e.g. to obtain the population of pregnant women, by multiplying the total population in each administrative zone by 5%).
- "Population value not known": for this, it is assumed you do not know the official total distribution of each administrative unit. AccessMod therefore assumes that the sum of population in each administrative unit is the correct one and redistribute this total population outside barriers.
...