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Allow reading alternative nasion label (Nz) from snirf file #13615
Description
Describe the new feature or enhancement
When reading landmarkPos3D data from a snirf file, the only accepted nasion label in landmarkLabels is "nasion", it would be nice to also allow reading nasion coordinates in the case where the label for the nasion is Nz.
mne-python/mne/io/snirf/_snirf.py
Line 397 in 7ee7155
Describe your proposed implementation
just add nz as another option, e.g. :
elif dign in [b"nasion", b"nz"]:
Describe possible alternatives
None
Additional context
The snirf spec does specifically mention "nasion", but it does really specify it as the standard
Activity
drammock commentedon Jan 27, 2026
is there a particular snirf writer that does it that way? Do we also need to add capitalized versions, e.g., Nasion and Nz?
kdarti commentedon Feb 2, 2026
I work for Artinis, Nz is the label we use for Nasion in our snirf exports. I think NIRx also uses Nz (that's the label in nirsite), see this open nirx dataset.
The check is case-insensitive, so no need for more labels.
drammock commentedon Feb 2, 2026
ok +1 then for your proposed implementation:
can you make a PR?