[Qgis-user] Problem georeferencing images in UTM

[Nicolas Cadieux]

Hi,
Disable projection on the fly.  Make sure the project is in the same CRS as your maps.
Nicolas

> Le 17 mai 2018 à 12:14, Carlos Henrique Grohmann de Carvalho <carlos.grohmann at gmail.com> a écrit :
> 
> Hello all
> 
> I have two pngs of topographic maps from southeastern Brazil (a zip file with images and points is available here: https://www.dropbox.com/s/mexeh4be46pgsk6/images_georef.zip?dl=0)
> 
> I'm trying to georeference them, but with partial success only. In this image (https://www.dropbox.com/s/37xxqp4fkwpdyqh/utm_error.png?dl=0) you can see that the X coordinate is fine, but the Y coordinate of the two maps won't match.
> 
> Both maps use South American Datum 1969. I selected points near the edges, and used the UTM values. 
> 
> Interestingly, if I use Lat/Long, and place the points at the corners, using decimal degrees, the maps align perfectly.
> 
> 
> Any help is appreciated
> 
> 
> -- 
> Prof. Carlos Henrique Grohmann
> Institute of Energy and Environment - Univ. of São Paulo, Brazil
> - Digital Terrain Analysis | GIS | Remote Sensing - 
> 
> http://carlosgrohmann.com
> http://orcid.org/0000-0001-5073-5572
> ________________
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