# geopandas.GeoSeries.force_3d#

GeoSeries.force_3d(z=0)[source]#

Forces the dimensionality of a geometry to 3D.

2D geometries will get the provided Z coordinate; 3D geometries are unchanged (unless their Z coordinate is `np.nan`).

Note that for empty geometries, 3D is only supported since GEOS 3.9 and then still only for simple geometries (non-collections).

Parameters:
zfloat | array_like (default 0)

Z coordinate to be assigned

Returns:
GeoSeries

Examples

```>>> from shapely import Polygon, LineString, Point
>>> s = geopandas.GeoSeries(
...     [
...         Point(1, 2),
...         Point(0.5, 2.5, 2),
...         LineString([(1, 1), (0, 1), (1, 0)]),
...         Polygon([(0, 0), (0, 10), (10, 10)]),
...     ],
... )
>>> s
0                          POINT (1 2)
1                  POINT Z (0.5 2.5 2)
2           LINESTRING (1 1, 0 1, 1 0)
3    POLYGON ((0 0, 0 10, 10 10, 0 0))
dtype: geometry
```
```>>> s.force_3d()
0                                POINT Z (1 2 0)
1                            POINT Z (0.5 2.5 2)
2             LINESTRING Z (1 1 0, 0 1 0, 1 0 0)
3    POLYGON Z ((0 0 0, 0 10 0, 10 10 0, 0 0 0))
dtype: geometry
```

Z coordinate can be specified as scalar:

```>>> s.force_3d(4)
0                                POINT Z (1 2 4)
1                            POINT Z (0.5 2.5 2)
2             LINESTRING Z (1 1 4, 0 1 4, 1 0 4)
3    POLYGON Z ((0 0 4, 0 10 4, 10 10 4, 0 0 4))
dtype: geometry
```

Or as an array-like (one value per geometry):

```>>> s.force_3d(range(4))
0                                POINT Z (1 2 0)
1                            POINT Z (0.5 2.5 2)
2             LINESTRING Z (1 1 2, 0 1 2, 1 0 2)
3    POLYGON Z ((0 0 3, 0 10 3, 10 10 3, 0 0 3))
dtype: geometry
```