I am trying to extract information on vegetation cover within a set radius of point locations (my sites). I have succeeded in creating a new vector layer of circles with a 5 km radius around my sites.
What I want to do is calculate the amount of vegetation cover within each of these circles (and therefore, within a 5 km radius of my sites), which I have as a raster layer. I would like to extract this either as a direct measurement of land cover (e.g. metres squared), or even just a percentage of the 5 km radius circle/polygon that is covered by the raster layer of vegetation (because I could then calculate the land cover from that).
I am aware that the LeCos plugin can somehow do this, but I have not succeeded in installing this (subject of another question I have posted) and was hoping there might be another way. I would be open to trying this in R if someone can point me in the right direction ( I am a user of R for statistical analysis but haven't yet tried it for spatial analysis).