Re: [Qgis-user] skewed GCPs

[Zirneklitis]

I suppose, that "Polynomial 1" is linear transformation which preserves 
straight lines. Four points are too few :( By the way – these four 
points should be as far into the raster-map corners as possible.

K.
T. Gray Shaw wrote:
Oh sorry, that was Polynomial 1, using only four GCPs. I'd have used
Polynomial 2 but it was hard to find matching points.

..
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