Calculate the required level based on a bounding box and a cellsize
n_level(bbox, cellsize)A two-column matrix. The first column has the minimum, the second the maximum values. Rows represent the spatial dimensions.
The size of each cell. Either a single value or one value for each dimension.
the required level to cover the bbox using a grid with cellsize
Other utility:
compact_db(),
create_index(),
has_index(),
is_grtsdb(),
which_level()