[Gvsig_english] Raster georeferencing

[ernesto sferlazza]

Hello list and developers
The algorithms at the moment available for raster georeferencing are
"affine" and polinomial (1st, 2nd and 3rd order). The question I
retrieve is: aren't "affine" and "polinomial 1st order" the same
transformation?
Anyway, nothing happens when I select "affine" transformation and try
to start the process.
Moreover: working with a 1st order transformation, if I use only three
Ground Control Points (the minimum theoretic to resolve the
transformation) the RMS should be zero, but it results different
instead. Why?
Best regards
Ernesto Sferlazza

-- 
ing. Ernesto Sferlazza
responsabile nodo provinciale di Agrigento del SITR Sicilia
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