How to get a downward pointing z axis

[sebwolf-de]

Hi,
I am trying to get a CRS with a downward pointing z-axis. So I specified +axis=ned. The x and y axis are correct, just the z-axis is still pointing upwards:

In [1]: from pyproj import CRS

In [3]: CRS.from_user_input("+proj=utm +zone=34 +ellps=GRS80 +units=m +axis=ned +type=crs").to_3d()
Out[3]:
<Projected CRS: PROJCRS["unknown",BASEGEOGCRS["unknown",DATUM["Unk ...>
Name: unknown
Axis Info [cartesian]:
- N[north]: Northing (metre)
- E[east]: Easting (metre)
- h[up]: Ellipsoidal height (metre)
Area of Use:
- undefined
Coordinate Operation:
- name: UTM zone 34N
- method: Transverse Mercator
Datum: Unknown based on GRS80 ellipsoid
- Ellipsoid: GRS 1980
- Prime Meridian: Greenwich

[snowman2]

You could try: https://pyproj4.github.io/pyproj/stable/build_crs.html

You could also ask the PROJ devs: https://github.com/osgeo/proj