[Qgis-developer] Re: [Qgis-user] Error in Georeferencer tool

[Agustin Lobo]

I've uploaded the input layer and points file to:
https://sites.google.com/site/filestemp2/home/Ilerfly125v2.tif?attredirects=0&d=1
https://sites.google.com/site/filestemp2/home/Ilerfly125v2.tif.points?attredirects=0&d=1

in case someone could test prior reporting this as a bug.

Agus

2011/11/28 Agustin Lobo <alobolistas at gmail.com>:
> Unfortunately this is not the case with ED50 UTM31N: the resulting layer has the
> correct CRS, but it is shifted. The points appear where they have to
> be, but the raster layer
> is shifted.
> We'll try with points set on google mercator.
> Thanks
>
> 2011/11/28  <dennis at dmlinton.net>:
>> Hi, Agus;
>>
>> You set your desired CRS in the Georeferencing properties.  What I am
>> saying is that this setting seems to be ignored and, in place of the
>> specified CRS, some strange unknown custom CRS is substituted.  By going
>> to the layer properties for the georeferenced layer (after it has been
>> added to your project) and resetting the CRS to the correct one, the
>> georeferenced layer then displays properly.  This is my experience
>> anyhow - particularly using Google or OSM (both have Google Mercator CRS)
>> maps as reference.
>>
>> Best regards,
>>    Dennis
>>
>>> 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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>>
>>
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>