<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'>
<p>Does anyone have any idea whether the elevations, be they in feet or metres, are all respecting the wiki definition of being the height above MSL according to EGM96 (not sure what that would mean in landlocked areas) and NOT WGS84 or (strictly speaking) relative to local MSL?</p>
<p>The wiki page for ele[1] says this:</p>
<p><strong>Elevation (height above sea level) of a point in metres.</strong><span><span> </span>This is mainly intended for mountain<span> </span></span><a title="Tag:natural=peak" href="http://wiki.openstreetmap.org/wiki/Tag:natural%3Dpeak">peaks</a><span><span> </span>but could also be used for elevation of airport runways and many other objects. For OpenStreetMap, this value should be in meters above above mean sea level as defined by the<span> </span></span><a class="extiw" title="wikipedia:EGM96" href="http://en.wikipedia.org/wiki/EGM96">EGM96</a><span><span> </span>geoid model. This elevation is usually very close to national "above sea level" systems with differences < 1m. This is not the height above the WGS84 ellipsoid (see<span> </span></span><a class="extiw" title="wikipedia:Geoid" href="http://en.wikipedia.org/wiki/Geoid">Geoid</a><span>) which is shown as raw elevation by some satellite navigation devices and which can differ from geoid elevation by up to 100m.</span></p>
<p><span>If we can't even rely on the reference point for these elevations, discussions about feet vs. metres (assuming the unit is indicated properly) are close to "bikeshedding".</span></p>
<p><span>//colin</span></p>
<p>[1] http://wiki.openstreetmap.org/wiki/Key:ele</p>
<div> </div>
<p><br /></p>
<p>On 2017-09-08 10:39, Andrew Hain wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0"><!-- html ignored --> <!-- head ignored --><!-- meta ignored --> Or, indeed, you could put a conversion in the editor between the mapper typing a figure in and the elevation being saved to the database.<br /> <br /> --<br /> Andrew<hr style="display: inline-block; width: 98%;" />
<div id="divRplyFwdMsg" dir="ltr"><span style="font-size: 11pt; color: #000000; font-family: Calibri, sans-serif;"><strong>From:</strong> Warin <61sundowner@gmail.com><br /> <strong>Sent:</strong> 08 September 2017 02:59:39<br /> <strong>To:</strong> tagging@openstreetmap.org<br /> <strong>Subject:</strong> Re: [Tagging] Elevation in Feet as part of Peak Names</span>
<div> </div>
</div>
<div>
<div class="moz-cite-prefix">On 08-Sep-17 09:10 AM, Dave Swarthout wrote:</div>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div dir="ltr">Adding numeric values to the name of a peak is not okay. As for using feet in the "ele" tag instead of meters, JOSM discourages this practice and I think we should too. It's long past the time when Americans and other countries still using archaic and cumbersome measurement systems based on the length of the king's foot or thumb should embrace the metric system. The down side is that very peak I add involves an extra step.</div>
</blockquote>
<br /> Aviation still uses feet? <br /> Asking a mapper who may not be familiar with conversion into meters leads to errors. I'd rather have the render do the conversion as is done for other dimensions. <br />
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div dir="ltr">
<div> </div>
<div>Cheers,</div>
<div> </div>
<div>Dave</div>
</div>
<div class="gmail_extra"><br />
<div class="gmail_quote">On Fri, Sep 8, 2017 at 5:57 AM, Jo <span><<a href="mailto:winfixit@gmail.com">winfixit@gmail.com</a>></span> wrote:<br />
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;">
<div dir="ltr">ele can of course be in feett or lightyears for that matter, but it's a lot easier to work with if they are all in the same unit.</div>
<div class="HOEnZb">
<div class="h5">
<div class="gmail_extra"><br />
<div class="gmail_quote">2017-09-08 0:22 GMT+02:00 Warin <span><<a href="mailto:61sundowner@gmail.com">61sundowner@gmail.com</a>></span>:<br />
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;"><span><span>On 08-Sep-17 07:39 AM, Shawn K. Quinn wrote:<br /></span></span>
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;">On 09/07/2017 04:31 PM, Mike Thompson wrote:<br />
<blockquote class="gmail_quote" style="margin: 0 0 0 .8ex; border-left: 1px #ccc solid; padding-left: 1ex;">User Raymo853 and I are having a friendly discussion on changeset<br /> 50470413[1]. He has been adding the elevation of mountain peaks (in<br /> feet) to the name tag. For example, he changed "Crown Point" to "Crown<br /> Point 11,463 ft."[2] While the wiki doesn't specifically address the<br /> issue of elevation as part of a peak name, it does say "Name is the name<br /> only"[3].<br /> <br /> Could we get feedback from the wider community on this?</blockquote>
That's what this is for: <a href="https://wiki.openstreetmap.org/wiki/Key:ele"> https://wiki.openstreetmap.org<wbr />/wiki/Key:ele</a><br /> <br /> The only catch is that it has to be in meters, so you would tag<br /> ele=3493.9 in your example.<br /> </blockquote>
<span><br /> </span>+1 to name tag is name only.<br /> <br /> <br /> --------------------------<br /> <br /> ele tag should be used for this information.<br /> <br /> And I would think that the ele value can be in feet just like other dimensional units of width, height etc.<br /> <br /> Should this be put as a new proposal?
<div class="m_7923779453903023834HOEnZb">
<div class="m_7923779453903023834h5"><br /> <br /> <br /> ______________________________<wbr />_________________<br /> Tagging mailing list<br /> <a href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a><br /> <a href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.or<wbr />g/listinfo/tagging</a></div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
<br /> ______________________________<wbr />_________________<br /> Tagging mailing list<br /> <a href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a><br /> <a href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.<wbr />org/listinfo/tagging</a><br /> </blockquote>
</div>
<br /> <br clear="all" />
<div> </div>
-- <br />
<div class="gmail_signature">
<div dir="ltr">Dave Swarthout<br /> Homer, Alaska<br /> Chiang Mai, Thailand<br /> Travel Blog at <a href="http://dswarthout.blogspot.com"> http://dswarthout.blogspot.com</a></div>
</div>
</div>
<br /><fieldset class="mimeAttachmentHeader"></fieldset><br />
<pre>_______________________________________________
Tagging mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a>
</pre>
</blockquote>
<p><br /></p>
</div>
<!-- html ignored --><br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">_______________________________________________<br /> Tagging mailing list<br /> <a href="mailto:Tagging@openstreetmap.org">Tagging@openstreetmap.org</a><br /> <a href="https://lists.openstreetmap.org/listinfo/tagging">https://lists.openstreetmap.org/listinfo/tagging</a></div>
</blockquote>
</body></html>