[Qgis-user] Error in Georeferencer tool

[Agustin Lobo]

I was suspecting something like this too. But the question is that the CRS
of the input image should be, by definition, unknown. In case the input
image has a CRS, this CRS should be just ignored. Instead, the plugin
actually prompts the user about the CRS of the input image. And I do not
find any way to set the input CRS to unknown or just arbitrary x,y
coordinates (while this is possible in Grass).

Where you say:

"Upon resetting the CRS specified in the layer properties to the correct
one, all was well"
do you refer to the input or to the output image?

Agus

2011/11/27 Dennis M. Linton <dennis at dmlinton.net>

> **
> I have observed this behaviour in QGIS 1.7.2 and found, upon reviewing the
> layer properties of the georectified layer, that the coordinate reference
> system being used was NOT the one specified in the Georeferencing plugin.
> Rather, the CRS was some unknown custom CRS.  Upon resetting the CRS
> specified in the layer properties to the correct one, all was well.
>
> Hope this helps.
>
> Best regards,
>     Dennis
>
> --
> Dennis M. Linton, P.Eng.
> Tel: +1 (613) 473-1015
> Cell: +1 (705) 312-1336
> Skype: thedmlinton
>
>
>
>
>   On Sun, 2011-11-27 at 22:10 +0100, Agustin Lobo wrote:
>
>
> Hi!
> We are using the Georeferencer tool and the resulting image is shifted,
> please see the screenshot here:https://sites.google.com/site/filestemp2/home/error_georef.jpg?attredirects=0
>
>
> We've tried polynomia of order 1 and 2 and Helmert, with very similar results.
>
> I think this is a bug, but I'm not sure we are not actually doing
> something wrong.
>
> Agus
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