<div dir="ltr">Hi Adam,<div>Thanks so much for your reply.</div><div>I&#39;ll take a look at them<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div>With the best,<br></div><div>Majid Hojati</div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Dec 8, 2019 at 10:20 PM Adam Wulkiewicz via Geometry &lt;<a href="mailto:geometry@lists.boost.org">geometry@lists.boost.org</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">W dniu 08.12.2019 o 21:39, Majid Hojati pisze:<br>
&gt; Thanks for your email, actually I have asked them and they said it is <br>
&gt; just forward transformation. How can I implement it? Do you know any <br>
&gt; kind of documentations or papers for that?<br>
At the proj website<br>
<a href="https://proj.org/operations/projections/isea.html" rel="noreferrer" target="_blank">https://proj.org/operations/projections/isea.html</a><br>
the original paper is listed:<br>
<a href="https://www.tandfonline.com/doi/abs/10.1559/152304088783886784" rel="noreferrer" target="_blank">https://www.tandfonline.com/doi/abs/10.1559/152304088783886784</a><br>
but it&#39;s behind the paywall so I don&#39;t know if the inverse projection is <br>
described there or is it even possible.<br>
<br>
A quick search reveals also that someone already tried to implement the <br>
inverse projection in 2017 but had problems with it:<br>
<a href="http://osgeo-org.1560.x6.nabble.com/Inverse-Icosahedral-Snyder-Equal-Area-ISEA-Projection-td5345223.html" rel="noreferrer" target="_blank">http://osgeo-org.1560.x6.nabble.com/Inverse-Icosahedral-Snyder-Equal-Area-ISEA-Projection-td5345223.html</a><br>
The student mentions that the inverse projection is described in the <br>
paper on page 14.<br>
<br>
Adam<br>
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</blockquote></div>