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- "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.
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The panel for this tool and its functionalities is as follow:
(1) “Select population (raster)”: select the raster format layer containing the spatial distribution of the target population
(2) “Select merged land cover layer (raster)”, select the raster format layer containing the merged land cover resulting from the use of the first tool (see Section 5.5.2) - named "land cover merged"
(3) Under "Correction mode", select the correction mode to be applied
(4) Under “Select zone name (text)", select the field from the zone boundaries layer
(5) Select the population column that holds the population number to match, if the correction mode "Population value known" was selected
(46) Under “(Add short tags)”, give short tags, we will use “adjusted_population" for the present exercise
(57) You can then click the “Compute" button, in case there are no issues, to launch the calculation