<html aria-label="message body"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Even,<div>Thank-you for your thoughts.</div><div><br></div><div>As mentioned in my OP, the CRS isn’t a DGGS. It is a continuous CRS that acts as the backbone for a DGGS.</div><div>Consider, please, the net projections that are run using the current system (albeit via the python module).</div><div><br></div><div><a href="https://raw.githubusercontent.com/MrBenGriffin/hex9/refs/heads/main/images/rhombus.jpg">https://raw.githubusercontent.com/MrBenGriffin/hex9/refs/heads/main/images/rhombus.jpg</a> </div><div><br></div><div>Or</div><div><br></div><div><a href="https://raw.githubusercontent.com/MrBenGriffin/hex9/refs/heads/main/images/butterfly.jpg">https://raw.githubusercontent.com/MrBenGriffin/hex9/refs/heads/main/images/butterfly.jpg</a></div><div><br></div><div>Those are projections under the CRS declared in the OP - they are not representative of a DGGS.</div><div><div>I’m not denying that the CRS is related to (and supports) DGGS - but it is not a DGGS.</div></div><div><br></div><div>The query concerned how best to capture a global coordinate that involves an octahedral scheme - It feels like you picked up on something else.</div><div>One of the aspects of this, which to me feels the most obvious, is that a CRS is continuous, while a DGGS is not.</div><div><br></div><div>I feel that my position on this is defensible.</div><div><br></div><div>Best regards</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>Ben.</div><div></div><div><br></div><div><div><blockquote type="cite"><div>On 22 Mar 2026, at 16:47, Even Rouault <even.rouault@spatialys.com> wrote:</div><br class="Apple-interchange-newline"><div><div>Hi Ben,<br>I don't think PROJ API is the best fit for DGGS implementations. Probably https://github.com/ecere/dggal would be a better host (I haven't used it myself)<br>And AFAIK, WKT / ISO-19111 hasn't been designed with DGGS use cases in mind either.<br><br>Even<br></div></div></blockquote></div><br></div><div><br></div></body></html>