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
resp. gruppo Sistema Informativo Territoriale
Provincia regionale di Agrigento
sede istituzionale: piazza Aldo Moro, 1 - 92100 AGRIGENTO
sede operativa: via Acrone, 27 - 92100 AGRIGENTO
cell. 3392718463 (personale)
       3316874296 (aziendale)
tel. uff 0922593752
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[jldominguez]

Some javascript/style in this post has been disabled (why?)

Hello, Ernesto.

I think there was a problem in the georreference option in gvSIG 1.1.2, but I think in version 1.9 it works fine. Which version are you using?

 

Can you send a screenshot showing exactly three control points and a RMS different from zero?

 

Regards,

 

 

 

Juan Lucas Domínguez Rubio
---

Prodevelop SL, Valencia (España)

Tlf.: 96.351.06.12 -- Fax: [phone]
http://www.prodevelop.es
---

---

De: [hidden email] en nombre de ernesto sferlazza
Enviado el: mié 14/10/2009 9:53
Para: [hidden email]
Asunto: [Gvsig_english] Raster georeferencing

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
resp. gruppo Sistema Informativo Territoriale
Provincia regionale di Agrigento
sede istituzionale: piazza Aldo Moro, 1 - 92100 AGRIGENTO
sede operativa: via Acrone, 27 - 92100 AGRIGENTO
cell. 3392718463 (personale)
       3316874296 (aziendale)
tel. uff 0922593752
_______________________________________________
Gvsig_internacional mailing list
[hidden email]
http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional

_______________________________________________
Gvsig_internacional mailing list
[hidden email]
http://listserv.gva.es/cgi-bin/mailman/listinfo/gvsig_internacional