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

[Makoto Miyakoshi]

Dear Stefanie,

> a) does anyone have a file that already contains the electrode positions
in longitude and latitude,

I have never heard of that coordinate system. How do you compute that? As
long as definition is available, converting from one system to another
should be straightforward.

Makoto

On Wed, Jun 29, 2016 at 1:20 PM, Stefanie Nickels <
stefanie.nickels at gmail.com> wrote:

> 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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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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