Returns the root directory the catalogue is built from. The
default is the ABMI science share; override it with the
sciSpatialR.spatial_root option or the
SCISPATIALR_SPATIAL_ROOT environment variable, which is how
you point the catalogue at a mirror, a mapped drive letter, or a
local copy.
Examples
if (FALSE) { # \dontrun{
spatial_root()
options(sciSpatialR.spatial_root = "D:/spatial_data")
spatial_root()
} # }