I have absolutely no experience with GIS, it just so happens that one of the hobby projects I am doing at the local hackerspace includes tracking a model boat with a GPS... I hope this is the right place to ask! [If not, I would appreciate suggestions on where to turn for help].
Here's my problem: today we went testing the new model boat, but when I processed the log, I noticed that for some strange reason, some of the GPS readings are totally off (see picture below: we never actually sailed on the left of the trees).
I was wandering if there is a standard way to filter a GPS log to spot and eliminate such noisy signals. The only obvious way I could think of was to tell the filter the a maximum speed for the boat that was tracked, and simply exclude any signal that would imply the boat to have travelled fastest than that maximum speed. Is there a better way?
Since our boat is a model one and most of the times it travels at speeds below the knot, I was wondering if there is a clever way to "rectify" points that are probably wrong. An example: suppose the boat is travelling east to west and the track looks something like:
it is quite possible that the central dot is a glitch in the GPS, but rather than dropping the log signal altogether, I would like to "correct" it [each log record contains information about the electronics too, and this data is always correct]. Again: is there a standard way to "smooth" a GPS track? I thought some sort of solution could pass through the standard deviation, but I am clueless on how to proceed.
Additional information: we are using python for processing the log, but while code snippets are always appreciated, I'd be more than pleased with a general explanation of the algorithm that I would implement myself.
Many thanks in advance for your time and expertise.