<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 dir="ltr" class=""><div class="">Hi Chris,</div><div class=""> This makes sense, thanks. The trail is oriented predominantly North West and is 318 miles so a bit longer than km. I’ll check out the article and try UTM Zone 10 I think and see how that goes.</div><div class=""><br class=""></div><div class="">Much appreciated!</div><div class=""><br class=""></div><div class="">Tim Fearn</div><div class=""><br class=""></div><div class="">Hi Tim,</div><div class=""><br class=""></div><div class="">EPSG4326 is geographic coordinates, not metres nor feet. But we're not really interested in the projection of the project, we're interested in the projection of the data set that contains the trail.</div><div class=""><br class=""></div><div class="">The first thing I would try is to project your trail dataset into a relevant rectangular coordinate system. You don't mention the orientation of your trail but 318 km is fairly long, so you need to be careful in your choice of projections. For example, a UTM zone is about 360 km wide at the equator, so if your trail is aligned predominantly E-W you may experience some error due to distortion near the edges. You might benefit by reviewing this Wikipedia article</div><div class=""><br class=""></div><div class=""><a href="https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system" class="">https://en.wikipedia.org/wiki/Universal_Transverse_Mercator_coordinate_system</a></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 30, 2023 at 12:51 PM Tim Fearn <<a href="mailto:mountainprana.map.works@gmail.com" class="">mountainprana.map.works@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div style="overflow-wrap: break-word;" class="">Hi Chris,<div class=""><br class=""></div><div class=""> The project CRS is WGS 84, aka EPSG 4326. All layers have been normalized to this CRS and clipped to the study boundaries.</div><div class=""><br class=""></div><div class="">I haven’t tried playing around with various projections to see if that changes anything. I’m not very well versed on the mathematics behind such things. Appreciate your reply and happy to answer any other questions.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Tim Fearn</div><div class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Mar 30, 2023, at 1:43 PM, chris hermansen <<a href="mailto:clhermansen@gmail.com" target="_blank" class="">clhermansen@gmail.com</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class="">Tim and list,<br class=""></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr"><br class=""></div><div class="">What is the projection of your data? <br class=""></div><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-style: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><br class="">The more specific information you can share, the more likely it is someone can help you. </blockquote></div><br clear="all" class=""><br class="">-- <br class=""><div dir="ltr" class=""><div dir="ltr" class="">Chris Hermansen · clhermansen "at" gmail "dot" com<br class=""><br class="">C'est ma façon de parler.</div></div></div></div></blockquote></div><br class=""><div class=""><br class=""></div></div></div></blockquote></div><br clear="all" class=""><br class=""><span class="gmail_signature_prefix">-- </span><br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class="">Chris Hermansen · clhermansen "at" gmail "dot" com<br class=""><br class="">C'est ma façon de parler.</div></div></body></html>