[GRASSLIST:6846] i.rectify polynomial order

[Luca Penasa]

Thanks all for the help...

Im now using i.rectify to gereference some maps, but i dont understand 
the difference between using a 1,2 or 3 grade polynomial. I see that if 
i want to use the 3 grade polynomial i have to mark 10 points (or more), 
is a 3 grade polynomial better (in precicion and accuracy) than a 2 or 
1-grade polynomial? If i use a a 1 grade polynomial is not the same if i 
use a 3 grade  with the same number of point? where is the difference?
 
 
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