## vectools.is_z_axis_zero()


Check if the Z axis in a GeoDataFrame is always zero.


Usage

``` python
vectools.is_z_axis_zero(gdf)
```


## Parameters


`gdf: geopandas.GeoDataFrame`  
GeoDataFrame containing geometries with potential Z coordinates.


## Returns


`bool`  
True if all Z values are zero, False otherwise.


## Raises


`ValueError`  
If the geometry does not have a Z axis.

`TypeError`  
If the geometry type is unknown.