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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Very clunky, but if you have a consecutive numerical field in your table, you could add a new field which equals old field -1, then
bring the table in twice and link by old field to new field. The rest should be easy.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US">Probably much easier in a database though.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:windowtext"> qgis-user-bounces@lists.osgeo.org
[mailto:qgis-user-bounces@lists.osgeo.org] <b>On Behalf Of </b>Randal Hale<br>
<b>Sent:</b> Monday, 18 August 2014 6:43 AM<br>
<b>To:</b> dean.walker151@gmail.com; qgis-user@lists.osgeo.org<br>
<b>Subject:</b> Re: [Qgis-user] Velocity Difference Calculation?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">The part of me that screams deadline thinks maybe you toss it into excel/calc and derive time then join that info back the distance portion. The minute I finished that sentence that might work for a few lines/distance
- but you might have more than a few points/lines in the problem. <br>
<br>
To quote a person I once knew "That's a thinker". <br>
<br>
<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">On 08/17/2014 06:34 PM, <a href="mailto:dean.walker151@gmail.com">
dean.walker151@gmail.com</a> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">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.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Thanks!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Dean <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Sent from Windows Mail<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-family:"Calibri","sans-serif";letter-spacing:.25pt">From:</span></b><span style="font-family:"Calibri","sans-serif";letter-spacing:.25pt"> <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></span><span style="font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-family:"Calibri","sans-serif"">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 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>
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<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">On 08/17/2014 05:57 PM,
<a href="mailto:dean.walker151@gmail.com" target="_parent">dean.walker151@gmail.com</a> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Hi all,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">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?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Dean<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif"">Sent from Windows Mail<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif""><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Qgis-user mailing list<o:p></o:p></pre>
<pre><a href="mailto:Qgis-user@lists.osgeo.org" target="_parent">Qgis-user@lists.osgeo.org</a><o:p></o:p></pre>
<pre><a href="http://lists.osgeo.org/mailman/listinfo/qgis-user" target="_parent">http://lists.osgeo.org/mailman/listinfo/qgis-user</a><o:p></o:p></pre>
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