[Qgis-developer] Enhanced georeferencer plugin

[Maxim Dubinin]

Jukka,

Please try downloading dll for windows from the same page, I've
updated it. Please note, it might be unstable, so use at your own
risk. No viruses, I promise ;)

To other QGIS developers,
We'd greatly appreciate if someone can try to help us build a new
C++ based georeferencer-gdal for Windows for testing. I should admit we suck with
building our plugins for Win lately, nothing works as needed :(

-- 
Best regards,
 Maxim

Вы писали 4 февраля 2009 г., 10:11:52:

RJ> Hi,

RJ> Great, that was fast!  I have a few scanned historical maps which
RJ> I have not yet warped with the manual way so I will for sure test
RJ> the plugin immediately when I can get it for Windows.

RJ> -Jukka Rahkonen-


>> -----Alkuperäinen viesti-----
>> Lähettäjä: Maxim Dubinin [mailto:sim at gis-lab.info] 
>> Lähetetty: 4. helmikuuta 2009 18:08
>> Vastaanottaja: Rahkonen Jukka
>> Kopio: qgis-developer at lists.osgeo.org
>> Aihe: Re: [Qgis-developer] Enhanced georeferencer plugin
>> 
>> Dear Jukka,
>> 
>> this functionality is already implemented in new Georeferencer plugin.
>> You can grab a copy for Ubuntu from svn mentioned here [1] or 
>> wait for new 1.0.1 (?) release of QGIS, where it will be part 
>> of standard distribution.
>> 
>> http://gis-lab.info/qa/qgis-georef-new-eng.html
>> 
>> Meanwhile, we'll be glad to hear from you regarding any 
>> problems with this plugin.
>> 
>> --
>> Best regards,
>>  Maxim                          mailto:sim at gis-lab.info
>> 
>> Вы писали 4 февраля 2009 г., 7:07:52:
>> 
>> RJ> Hi,
>> RJ> This message has been lying for some days in QGis forum and now I 
>> RJ> was adviced to send it to mailing list.
>> RJ> -Jukka Rahkonen-
>> RJ>  
>> RJ> Forum message follows:
>> RJ> "The Georeferencer plugin is pretty nice to use. However, I have 
>> RJ> found that the result of georeferencing with world file is not 
>> RJ> always satisfactory. Therefore I have used the fine user 
>> interface 
>> RJ> for collecting ground control points and done the rest of 
>> RJ> georecerencing with other tools. However, I believe that 
>> it should 
>> RJ> be rather easy to modify the Georeferencer plugin so that 
>> it could 
>> RJ> do georeferncing also with this alternative way. As a result QGis 
>> RJ> would have a georeferencing tool of professional quality 
>> both when 
>> RJ> it comes to easy of use and accuracy.
>> RJ> The work flow would be like this:
>> RJ> 1. Ground control points are collected with the existing plugin.
>> RJ> It is gathering all the information that is needed for 
>> the next step 
>> RJ> (mapX, mapY, pixelX, pixelY) 2. Ground control points are fed for 
>> RJ> gdal_translate program as -gcp parameters. Gdal_translate 
>> takes them 
>> RJ> in this order:
>> RJ> [-gcp pixel line easting northing [elevation]]* The whole 
>> RJ> gdal_translate command line would be gdal_translate -of 
>> GTiff -gcp 
>> RJ> [params_1] -gcp [params_2] -gcp [params_3] .... input.tif 
>> RJ> temporary.tif 3. Third step is to warp the temparary image that 
>> RJ> contains now the ground control points. It is done with gdalwarp, 
>> RJ> for example like this:
>> RJ> gdalwarp -of GTiff -s_srs epsg:4326 -t_srs epsg:4326 
>> temporaty.tif 
>> RJ> warped.tif Command lines are presented as working 
>> examples which can 
>> RJ> be repeated with gdal utility programs. For the plugin it 
>> would be 
>> RJ> better to call gdal funtions directly, use virtual raster 
>> format as 
>> RJ> temporary format instead of tiff etc. I cannot say very 
>> much about 
>> RJ> how it should be done because I can't program myself.
>> RJ> However, in the very end of this link 
>> RJ> http://www.scangis.org/scangis2007/papers/r3_rahkonen.pdf 
>> there is 
>> RJ> python code that might be useful and that can be used 
>> freely. That 
>> RJ> script is doing basically the same thing, it takes ground control 
>> RJ> points from external source and warps image automatically 
>> with gdal components."
>> RJ> _______________________________________________
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>> RJ> Qgis-developer at lists.osgeo.org
>> RJ> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>> 
>>