I have 2 vector layers of points:
- one with a point for each house in the city (thanks to osm.org), roughly equivalent to population
- one with a point for each case of cholera in the city
I'm trying to define in which locations I should site new water supply points based on a local attack rate (ie: number of cholera cases / local population). I've built separate heat maps for each layer (using QGIS heat map plugin), but it's hard to visually figure out hot spots.
So I'm looking for a way to calculate this local attack rate, ideally something like (number of cases within X meters radius / number of houses within same radius) and spit that out as a raster layer. Basically just like a heat map, but using a ratio rather than a simple count.
I'm guessing there's some magic keyword I don't know that will open a swath of solutions. Can anyone point me in the right direction? I'm using QGIS.