Name for error resulting from GPS sampling on curves?
August 18, 2011 6:06 AM Subscribe
Is there a proper name for errors in distance calculated by GPS logs resulting from a curving path not receiving enough samples to define it and thus being shortened?
posted by c0nsumer to Technology (7 answers total) 1 user marked this as a favorite
I do a lot of mountain biking and have taken to using a GPS to log my distance. Typically I use a 1 second sample rate, but I find that some tight, fast, curvy parts of trails don't seem to be logged because two subsequent samples occur just before and after a curve, smoothing it out.
Is there a proper term for this sort of error? I've been referring to it as a "chording error" because it results in the distance measurement being taken based on a rather substantial chord of the curve.
(Please note, I understand that there will always be some amount of chording on curves simply because GPS-based measurement is done via discrete samples. I'm just trying to better understand the issue and the terms used to describe it.)