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<div data-externalstyle="false" dir="ltr" style="font-family: 'Calibri', 'Segoe UI', 'Meiryo', 'Microsoft YaHei UI', 'Microsoft JhengHei UI', 'Malgun Gothic', 'sans-serif';font-size:12pt;"><div>Yeah, I’ve got a distance reference that covers the amount of distance covered in the time from the last point. I’m just missing the way to actually do the calculation in the program. I cant see a way to compare a point to the one before it.</div><div><br></div><div>Thanks!</div><div>Dean <br></div><div data-signatureblock="true"><div><br></div><div>Sent from Windows Mail</div><div><br></div></div><div style="padding-top: 5px; border-top-color: rgb(229, 229, 229); border-top-width: 1px; border-top-style: solid;"><div><font face=" 'Calibri', 'Segoe UI', 'Meiryo', 'Microsoft YaHei UI', 'Microsoft JhengHei UI', 'Malgun Gothic', 'sans-serif'" style='line-height: 15pt; letter-spacing: 0.02em; font-family: "Calibri", "Segoe UI", "Meiryo", "Microsoft YaHei UI", "Microsoft JhengHei UI", "Malgun Gothic", "sans-serif"; font-size: 12pt;'><b>From:</b> <a href="mailto:rjhale@northrivergeographic.com" target="_parent">Randal Hale</a><br><b>Sent:</b> Sunday, August 17, 2014 3:22 PM<br><b>To:</b> <a href="mailto:dean.walker151@gmail.com" target="_parent">dean.walker151@gmail.com</a>, <a href="mailto:qgis-user@lists.osgeo.org" target="_parent">qgis-user@lists.osgeo.org</a></font></div></div><div><br></div><div dir="">
I can think of a couple of ways you might be able to do this - but
considering I haven't done something like this before it's a guess.
<br>
<br>
You can derive an interval in seconds I believe (referencing
<a class="moz-txt-link-freetext" href="http://nathanw.net/2012/06/30/better-date-and-time-support-in-qgis-expressions-and-styles/" target="_parent">http://nathanw.net/2012/06/30/better-date-and-time-support-in-qgis-expressions-and-styles/</a>)
from the point data - I'm assuming you have date and time (or at
least time). <br>
<br>
You could connect the points with a line (that would give you
distance). <br>
<br>
I'm thinking this might be better accomplished in a database as
opposed to a shapefile (assuming shapefile). <br>
<br>
...and I think I've just given you the most abstract assumed
non-answer ever. <br>
<br>
Lemme think on this one a bit more. Hopefully someone has a
practical answer. <br>
<br>
Randy<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 08/17/2014 05:57 PM,
<a class="moz-txt-link-abbreviated" href="mailto:dean.walker151@gmail.com" target="_parent">dean.walker151@gmail.com</a> wrote:<br>
</div>
<blockquote style="margin-top: 0px; margin-bottom: 0px;" cite="mid:af53bff48c8645e7936df83972c05e32@gmail.com">
<div>
<div>Hi all,</div>
<div><br>
</div>
<div>I’m working on some point data that has been collected
using a combine in an agricultural field. Trying to figure
out a way to compare speed between the dropped points? I’m
not sure how to start….can anyone help?</div>
<div><br>
</div>
<div>Thanks</div>
<div>Dean</div>
<br>
</div>
<div data-signatureblock="true">
<div><br>
</div>
<div>Sent from Windows Mail</div>
<div><br>
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