I use a shapefile with CRS ("+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"). I want to calculate a buffer around the points with 'extract' from raster package. How can I know the units in this layer? Is it in meters? My idea is to calculate 1X1 km , thus buffer=1000. Is that correct?
try1 <- extract(raster, points, fun=mean, na.rm=T, sp = TRUE, # create spatial object buffer = 1000, method='simple', weights=T, normalizeWeights=F)