[Qgis-user] problems with georeferencing results

[G. Allegri]

Richard, I can strip the crs off using gdal_translate and setting a Baseline
profile. But I wanted to test what happens when a raster is already
georeferenced.

Giovanni

Inviato da dispositivo mobile
Il giorno 26/ott/2011 09.23, "Richard Duivenvoorde" <rdmailings at duif.net> ha
scritto:

> On 2011-10-26 00:42, G. Allegri wrote:
> > Ok, i got it.
> > The reason it doesn't work is probably easily explained: the source X/Y
> > are considered as raster space coordinates, while I thought that having
> > the raster a CRS assigned this was kept into account during the warping.
> > Probably manual re-georeferencing is conceptually unuseful, outside my
> > exercise. Even if reprojection wasn't enough, the best way would be to
> > remove any CRS reference from it.
> > Tomorrow I will do more tests, but I'm pretty sure that I was simply
> > trying a wrong procedure...
>
> I think qgis/ogr takes your crs into account. But if you open your
> raster (tiff) in Gimp, and save it again as a tiff, Gimp will 'help' you
> to remove the crs information from your geo(tiff), giving you a plane
> raster with not crs information to do your tests :-)
>
> R
>
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