
<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Nyall</div><div class=""><br class=""></div>If omerc is the answer to the question have a look at this issue <a href="https://github.com/OSGeo/proj.4/issues/523" class="">https://github.com/OSGeo/proj.4/issues/523</a><div class="">which goes into details with the quirks of this projection. I am afraid the documentation isn’t very helpful</div><div class="">at this time.</div><div class=""><br class=""></div><div class="">If omerc isn’t what you need, take a look at ob_tran: <a href="https://proj4.org/operations/projections/ob_tran.html" class="">https://proj4.org/operations/projections/ob_tran.html</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">/Kristian<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 8 Jan 2019, at 08:18, Thomas Knudsen <<a href="mailto:knudsen.thomas@gmail.com" class="">knudsen.thomas@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Is the Oblique Mercator projection, available as proj=omerc, what you are searching for?<br class=""></div><br class=""><div class="gmail_quote"><div dir="ltr" class="">Den tir. 8. jan. 2019 kl. 07.06 skrev Nyall Dawson <<a href="mailto:nyall.dawson@gmail.com" class="">nyall.dawson@gmail.com</a>>:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi list,<br class="">

<br class="">

It's my understanding that this is only possible with the Proj 5<br class="">

pipeline API and the new helmert transform, but just in case:<br class="">

<br class="">

Is it possible in proj v4 to define a custom projection, based on a<br class="">

utm/tmerc projection, with a custom rotation applied? (and if so,<br class="">

what's the syntax for this?)<br class="">

<br class="">

Thanks!<br class="">

Nyall<br class="">

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</blockquote></div>

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