Using Aggregation and Disaggregation in Expressions

The methods aggregate and disaggregate are used to aggregate and disaggregate variable values over two or more datasets. The aggregate method associates information from one dataset to another along a many-to-one relationship, while the disaggregate method does the same along a one-to-many relationship. Some examples are:

• zone.aggregate(gridcell.population)

• zone.aggregate(2.5*gridcell.population)

• zone.aggregate(urbansim.gridcell.population)

• neighborhood.aggregate(gridcell.population, intermediates=[zone,faz])

• neighborhood.aggregate(gridcell.population, intermediates=[zone, faz], function=mean)

• zone.aggregate(gridcell.population, function=mean)

• region.aggregate_all(zone.my_variable)

• region.aggregate_all(zone.my_variable, function=mean)

• faz.disaggregate(neighborhood.population)

• gridcell.disaggregate(neighborhood.population, intermediates=[zone, faz])

The syntax and semantics for these is as follows.