W dniu 08.12.2019 o 21:39, Majid Hojati pisze:
> Thanks for your email, actually I have asked them and they said it is
> just forward transformation. How can I implement it? Do you know any
> kind of documentations or papers for that?
At the proj website
https://proj.org/operations/projections/isea.html
the original paper is listed:
https://www.tandfonline.com/doi/abs/10.1559/152304088783886784
but it's behind the paywall so I don't know if the inverse projection is
described there or is it even possible.

A quick search reveals also that someone already tried to implement the
inverse projection in 2017 but had problems with it:
http://osgeo-org.1560.x6.nabble.com/Inverse-Icosahedral-Snyder-Equal-Area-ISEA-Projection-td5345223.html
The student mentions that the inverse projection is described in the
paper on page 14.

Adam
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