A vector, name of longitude and latitude attributes.
crs
A coordinate reference system: integer with the EPSG code, or
character with proj4string.
Details
If we start from a geographic layer, it initially transforms it into a table.
The CRS of the new layer is indicated. If a CRS is not indicated, it
considers the layer's CRS by default and, if it is not a layer, it considers
4326 CRS (WGS84).
See Also
Other level definition functions:
check_key(),
complete_point_geometry(),
get_empty_geometry_instances(),
get_geometry()