Makes each cell value a function of the attribute values assigned to the
vector points or centroids around it, and stores new cell values in
an output raster map layer.
EXAMPLE
Count the number of schools for a given grid (North Carolina sample
dataset):
The result gives for each grid cell the number of points (here: schools)
not farther than 1500 meter away (half of the given size value)
from the respective cell center.