[Qgis-user] Problem georeferencing images in UTM

[Carlos Henrique Grohmann de Carvalho]

Thanks Nicolas, but the misalignment still persists. OTF is off, project
has same CRS as data (epsg 29192). There is a ~400m difference in the N-S
direction.

Carlos

On Thu, May 17, 2018 at 1:28 PM, Nicolas Cadieux <
nicolas.cadieux at archeotec.ca> wrote:

> 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
> ________________
> Can’t stop the signal.
>
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
>


-- 
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
________________
Can’t stop the signal.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20180517/6978bbc6/attachment.html>