[Qgis-user] Velocity Difference Calculation?

[Randal Hale]

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.

You can derive an interval in seconds I believe (referencing 
http://nathanw.net/2012/06/30/better-date-and-time-support-in-qgis-expressions-and-styles/) 
from the point data  - I'm assuming you have date and time (or at least 
time).

You could connect the points with a line (that would give you distance).

I'm thinking this might be better accomplished in a database as opposed 
to a shapefile (assuming shapefile).

...and I think I've just given you the most abstract assumed non-answer 
ever.

Lemme think on this one a bit more. Hopefully someone has a practical 
answer.

Randy




On 08/17/2014 05:57 PM, dean.walker151 at gmail.com wrote:
> Hi all,
>
> 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?
>
> Thanks
> Dean
>
>
> Sent from Windows Mail
>
>
>
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