For a single
y is missing) this method computes the distance, for all cells that are
NA, to the nearest cell that is not
The distance unit is in meters if the RasterLayer is not projected (
+proj=longlat) and in map units (typically also meters) when it is projected.
RasterLayer objects are provided, the cell-value distances are computed.
Spatial vector type objects are provided, the distances between pairs of geographic object are computed.
# S4 method for RasterLayer,missing distance(x, y, filename='', doEdge=TRUE, ...) # S4 method for RasterLayer,RasterLayer distance(x, y, ...) # S4 method for Spatial,Spatial distance(x, y, ...)
missing, RasterLayer or Spatial object
Character. Filename for the output RasterLayer (optional)
boundaries function is called first. This may be efficient in cases where you compute the distance to large blobs. Calling
boundaries determines the edge cells that matter for distance computation
Additional arguments as for
gdistance package for more advanced distances, and the
geosphere package for great-circle distances (and more) between points in longitude/latitude coordinates.