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The plots that appear when you use this tool are supposed to help you figure that out. As you increase the polynomial order, you should see the curve of that order superimposed on the cross track signal. The idea is that you would want to choose a polynomial order that looks like it follows that cross track trend in the plot. At some point as you increase the order, you'll see the fitted curve deviate from the data, and then you know you've gone too far. If there are a more than one polynomial orders that look equally good, then I guess you would have to use trial and error to choose among them.
I don't know of another way, aside from looking at those plots, to determine the best polynomial order for your cross track correction.
- Peg
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