[Eeglablist] Spherical coordinates (longitude and latitude) for standard 10-20 system in degrees

[Andreas Widmann]

Dear Stefanie,

to my understanding sph_theta and sph_phi directly reflect longitude and latitude, respectively. Could you please explain your problem in more detail?

Best,
Andreas

> Am 29.06.2016 um 22:20 schrieb Stefanie Nickels <stefanie.nickels at gmail.com>:
> 
> Hello all,
> 
> I am looking for a file that contains the spherical coordinates for electrodes placed in the standard 10-20 system, but I specifically need the values in degrees of longitude and latitude.
> 
> I am aware that eeglab contains a number of channel location lookup files (such as standard-10-5-cap385.elp), but they only contain the spherical theta and phi (and radius, which is constant). I understand that these three values uniquely specify the electrode's position in the sphere, but I don't know how to get to longitude and latitude from there. So a) does anyone have a file that already contains the electrode positions in longitude and latitude, or b) can someone point me towards the formula that lets me solve for longitude and latitude from theta and phi?
> 
> Thank you all very much,
> Stefanie
> 
> 
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