Gps Distance Measurement
Deviation and GPS systems?
I was running the other day and thought about the following problem:
both bike riders AND runners now have GPS tools available to them. Which is more accurate? The runners are obviously moving slower than the bikers and the computer system on them is measuring smaller distance increments over a given period of time than the computer system on the biker. Does this make it more error prone or less error prone? Or neither? IE, is error in GPS simply a %% of the measurement or are there baseline distance errors that occur along with %% errors????
The amount of error is directly proportional to velocity. GPS units refresh position rapidly yet not constantly, but they show constant movement. They assume that until they receive information otherwise, you’re going to be traveling in the same direction at the same speed.
If you were biking along a path and turned 90 degrees suddenly, the GPS would display constant movement along your original vector, past the point you turned, and only update with accurate data when it received new information from the satellites. If you were to look at a non-road-oriented GPS track history, you would see very few right angles where there was a right angle turn: unless there was a full stop before the turn, the track will run past the turning point, then angle acutely back to the new path.
What it comes down to is, the more movement occuring between satellite updates, the more error.
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