<div dir="ltr"><div><div><div><div><div><div>I've checked<br><a href="https://en.wikipedia.org/wiki/Equirectangular_projection">https://en.wikipedia.org/wiki/Equirectangular_projection</a><br></div>and the French page was a bit better as the formula take into account lamba_0, but proj4 thus the us page did not !.<br><br><br></div>I am about to pull request the formula in eqc.rst as a first test : <a href="https://github.com/OSGeo/proj.4/pull/411">https://github.com/OSGeo/proj.4/pull/411</a><br></div>Let me know if something is wrong.<br></div><div>(note the big fast forward cos my fork was a bit away from the latests proj4 commit).<br><br><br></div>I need to sleep a bit !<br><br></div>Regards,<br></div>Julien.<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-09-02 22:49 GMT+02:00 Howard Butler <span dir="ltr"><<a href="mailto:howard@hobu.co" target="_blank">howard@hobu.co</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The intention right now is for those project pages to document proj4 projection methods as they are implemented. The intention is when a new projection method is added to Proj4, such as when +proj=times was just added this past release, a new page will be added there with all relevant information, math, and pointers.<br>
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> On Sep 2, 2016, at 3:36 PM, Julien Moquet <<a href="mailto:moquet.julien@gmail.com">moquet.julien@gmail.com</a>> wrote:<br>
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> Howard,<br>
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> How can I contribute to add formulae on <a href="http://proj4.org/projections/index.html" rel="noreferrer" target="_blank">http://proj4.org/projections/<wbr>index.html</a> ?<br>
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> As part of the exchange on spatialreference mailing list, I was about to check formulae on wikipedia. I think it will be valuable to share it on projections/index.html.<br>
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> Regards,<br>
> Julien.<br>
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> 2016-09-02 5:58 GMT+02:00 Howard Butler <<a href="mailto:howard@hobu.co">howard@hobu.co</a>>:<br>
> Kristian,<br>
><br>
> Thanks to your efforts generating a script to render the projections in a similar fashion as Gerald's PostScript files. I have taken those and updated the website <a href="http://proj4.org/projections/index.html" rel="noreferrer" target="_blank">http://proj4.org/projections/<wbr>index.html</a><br>
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> The idea is to provide an individual page for each projection that Proj.4 supports, and we would put all math and relevant supporting materials about that projection at that location. Something like <a href="http://proj4.org/projections/sinu.html" rel="noreferrer" target="_blank">http://proj4.org/projections/<wbr>sinu.html</a> There is a ton of material in the PostScript files (I do wish we had the original latex so there wasn't risk to getting the math notation wrong) that needs to be brought into these "projection pages", but we now have some scaffolding to support people contributing to this effort.<br>
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> Thanks again!<br>
><br>
> Howard<br>
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