Connection to OxCOVID19 Database. This can be specified using
the connect_oxcovid19() function.
layer
Name of spatial layer available in OxCOVID19 Database.
Currently, only administrative_division is a spatial layer.
ccode
Three character ISO country code for required country
layers.
adm
Numeric value for administrative level layer required. Possible
values are 0 for whole country, 1 for administrative level 1, 2 for
administrative level 2 and 3 for administrative level 3. Default is 0 for
country borders.
Value
An object of sf class of the specified spatial layer