Hello,
convertSELAFIN.py was a script written in Python 2. Since the switch to Python 3 scripts (release 8.0), previous scripts have been renamed, changed, improved, etc.
You can have a look at many features in the notebooks, run jupyter-notebook index.ipynb in $HOMETEL/notebooks folder
You may see run_telfile.py script and "Switching between lat/long, spherical, UTM coordinates (options --sph2ll, --ll2sph, --ll2utm, --utm2ll)".
You can also read notebooks in static form directly in:
gitlab.pam-retd.fr/otm/telemac-mascaret/...ipynb?ref_type=heads
or
gitlab.pam-retd.fr/otm/telemac-mascaret/...ipynb?ref_type=heads
e.g.
Hope this helps,
Chi-Tuan