I have population distribution data as a raster layer and exposure contours as vector (polygon) layers. What I'd like to do is use the vector layer to estimate the population indicated from the raster layer that fall underneath the polygon.
It seems like a pretty standard request to perform spatial query using data like this but I can't find any obvious solution. Which probably means I'm doing it wrong or I've missed a paragraph from "GIS101" so no one has needed to ask before.
Can someone shed some light on this? Perhaps the raster data needs to be flipped into vector data first? Is there an option for this already built in and I need to RTFM?
If it isn't straight forward, I am not too bad with Python so I'd be more than comfortable writing something that does this.
Thanks inn advance, Dan