I'm trying to use QGIS to profiling polygons in a layer. There is also another grid layer, each grid contains its own demographics information.
Assume the demographics are evenly distributed within the same grid. Therefore, I'm deriving the value for any demographic attribute of an outlet by summing the sections in different grids weighted by the area. and the calculation for area A, for instance, population, would be:
I know I can use the clip to have the intersects layer, use the field calculator to get the areas and then calculate the population for A1 and A3 separately.
How could I aggregate the sum population and add the population back to area A in the original polygon layer?