geopandas.GeoDataFrame.set_crs

GeoDataFrame.set_crs(crs=None, epsg=None, inplace=False, allow_override=False)

Set the Coordinate Reference System (CRS) of the GeoDataFrame.

If there are multiple geometry columns within the GeoDataFrame, only the CRS of the active geometry column is set.

Pass None to remove CRS from the active geometry column.

Parameters:

crspyproj.CRS | None, optional

The value can be anything accepted by pyproj.CRS.from_user_input(), such as an authority string (eg “EPSG:4326”) or a WKT string.

epsgint, optional

EPSG code specifying the projection.

inplacebool, default False

If True, the CRS of the GeoDataFrame will be changed in place (while still returning the result) instead of making a copy of the GeoDataFrame.

allow_overridebool, default False

If the the GeoDataFrame already has a CRS, allow to replace the existing CRS, even when both are not equal.

See also

GeoDataFrame.to_crs

re-project to another CRS

Notes

The underlying geometries are not transformed to this CRS. To transform the geometries to a new CRS, use the to_crs method.

Examples

>>> from shapely.geometry import Point
>>> d = {'col1': ['name1', 'name2'], 'geometry': [Point(1, 2), Point(2, 1)]}
>>> gdf = geopandas.GeoDataFrame(d)
>>> gdf
    col1     geometry
0  name1  POINT (1 2)
1  name2  POINT (2 1)

Setting CRS to a GeoDataFrame without one:

>>> gdf.crs is None
True

>>> gdf = gdf.set_crs('epsg:3857')
>>> gdf.crs
<Projected CRS: EPSG:3857>
Name: WGS 84 / Pseudo-Mercator
Axis Info [cartesian]:
- X[east]: Easting (metre)
- Y[north]: Northing (metre)
Area of Use:
- name: World - 85°S to 85°N
- bounds: (-180.0, -85.06, 180.0, 85.06)
Coordinate Operation:
- name: Popular Visualisation Pseudo-Mercator
- method: Popular Visualisation Pseudo Mercator
Datum: World Geodetic System 1984
- Ellipsoid: WGS 84
- Prime Meridian: Greenwich

Overriding existing CRS:

>>> gdf = gdf.set_crs(4326, allow_override=True)

Without allow_override=True, set_crs returns an error if you try to override CRS.