# EEG layouts mapping

**URL:** <https://mne.discourse.group/t/eeg-layouts-mapping/6289>\
**Category:** Support & Discussions\
**Tags:** eeg\
**Created:** [February 3, 2023, 12:51pm UTC](https://mne.discourse.group/t/eeg-layouts-mapping/6289 "2023-02-03T12:51:49Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![iliazaharov](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/iliazaharov/32/1919_2.png) [@iliazaharov](https://mne.discourse.group/u/iliazaharov)\
**Post date:** [February 3, 2023, 12:51pm UTC](https://mne.discourse.group/t/eeg-layouts-mapping/6289/1 "2023-02-03T12:51:49Z")

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Dear MNE community,

I have a task to combine data from two different datasets. One of them was collected with standard 10-10 system, and the other one with EGI Hydrogel caps. I have found the file matching 10-10 and Hydrogel electrode coordinates ([https://www.egi.com/images/HydroCelGSN\_10-10.pdf](https://www.egi.com/images/HydroCelGSN_10-10.pdf)), but I am a little bit confused with what to do next. Should I manually create the new montage file with the replaced coordinates and just apply it to EGI files? Or what is the correct way to map HydroGel to 10-10 system?

Thank you in advance for your help!

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**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [February 3, 2023, 1:24pm UTC](https://mne.discourse.group/t/eeg-layouts-mapping/6289/2 "2023-02-03T13:24:16Z")

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You could try to use one of our built-in GSN montages. To get a list of available montages, use [`get_builtin_montages()`](https://mne.tools/stable/generated/mne.channels.get_builtin_montages.html#mne.channels.get_builtin_montages).

Best wishes,  
Richard

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**Author:** ![iliazaharov](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/iliazaharov/32/1919_2.png) [@iliazaharov](https://mne.discourse.group/u/iliazaharov)\
**Post date:** [February 3, 2023, 1:40pm UTC](https://mne.discourse.group/t/eeg-layouts-mapping/6289/3 "2023-02-03T13:40:38Z")

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Thank you, Richard!

It will help to work with EGI data alone, but the problem still remians on how to combine data with the EEG from 10-10 system. EGI offers some matching so that you can use see which of their electrodes are placed closely to the location of 10-10 system. Can I just rename these electrodes to their matching types?

Best,  
Ilya

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**Author:** ![richard](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/richard/32/15_2.png) [@richard](https://mne.discourse.group/u/richard)\
**Post date:** [February 3, 2023, 3:30pm UTC](https://mne.discourse.group/t/eeg-layouts-mapping/6289/4 "2023-02-03T15:30:20Z")

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Yes you can probably simply rename those electrodes if they are in the approximately correct locations.

Best wishes,  
Richard

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**Author:** ![iliazaharov](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/iliazaharov/32/1919_2.png) [@iliazaharov](https://mne.discourse.group/u/iliazaharov)\
**Post date:** [February 6, 2023, 1:08pm UTC](https://mne.discourse.group/t/eeg-layouts-mapping/6289/5 "2023-02-06T13:08:33Z")

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Dear Richard, thank you very much for your help!