Add a `buffer` arguments in `split_on_poly` and `crop_on_poly` functions

[LucieContamin]

Would it be interesting to add a buffer arguments in the split_on_poly and crop_on_poly functions, to be able to select all the value of the raster even the cells that overlap with the polygon?

[choisy]

Sure! Can you please provide example raster and polygon?

[LucieContamin]

For example, if you run this code, you will see that on the border of Vietnam, we have some missing value.

vn <- sptools::gadm("Vietnam", "sf", 0)
vn <- sf::as_Spatial(vn)
r <- raster::getData("worldclim", var = "tmin", res = 10, lon = 104, lat = 11)
cropr <- sptools::crop_on_poly(r[[1]], vn)
sp::plot(cropr)
sp::plot(vn, add = TRUE)