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.
To quote a person I once knew "That's a thinker".
On 08/17/2014 06:34 PM, [email protected] wrote:
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.
Thanks!
Dean
Sent from Windows Mail
*From:* Randal Hale <mailto:[email protected]>
*Sent:* Sunday, August 17, 2014 3:22 PM
*To:* [email protected] <mailto:[email protected]>,
[email protected] <mailto:[email protected]>
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, [email protected] 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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