I am trying to compute population affected by various distances, during earthquake events. The earthquake point events update every minute and I need to find a way how to create automatic buffers and get real time statistics. At the moment, I have point data and have used geometry generator polygons to create the buffer affect for 5km, 10km and 20km (as can be seen via attachment). What is the best way to calculate zonal statistics using these polygons created through geometry generator?
I am also using Print Composer Atlas to export these maps in real time and would like to add the affected population for each buffer through a legend key on the map below. Is there any way I can do this?