GeoDataFrame.
crs
The Coordinate Reference System (CRS) represented as a pyproj.CRS object.
pyproj.CRS
Returns None if the CRS is not set, and to set the value it :getter: Returns a pyproj.CRS or None. When setting, the value can be anything accepted by pyproj.CRS.from_user_input(), such as an authority string (eg “EPSG:4326”) or a WKT string.
pyproj.CRS.from_user_input()