<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Hi,</div><div>Disable projection on the fly. Make sure the project is in the same CRS as your maps.</div><div>Nicolas</div><div><br>Le 17 mai 2018 à 12:14, Carlos Henrique Grohmann de Carvalho <<a href="mailto:carlos.grohmann@gmail.com">carlos.grohmann@gmail.com</a>> a écrit :<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr"><span style="font-size:12.800000190734863px">Hello all</span><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px">I have two pngs of topographic maps from southeastern Brazil (a zip file with images and points is available here: <a href="https://www.dropbox.com/s/mexeh4be46pgsk6/images_georef.zip?dl=0" target="_blank">https://www.dropbox.com/<wbr>s/mexeh4be46pgsk6/images_<wbr>georef.zip?dl=0</a>)</div><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px">I'm trying to georeference them, but with partial success only. In this image (<a href="https://www.dropbox.com/s/37xxqp4fkwpdyqh/utm_error.png?dl=0" target="_blank">https://www.dropbox.com/s/37x<wbr>xqp4fkwpdyqh/utm_error.png?dl=<wbr>0</a>) you can see that the X coordinate is fine, but the Y coordinate of the two maps won't match.</div><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px">Both maps use South American Datum 1969. I selected points near the edges, and used the UTM values. </div><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px">Interestingly, if I use Lat/Long, and place the points at the corners, using decimal degrees, the maps align perfectly.</div><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px"><br></div><div style="font-size:12.800000190734863px">Any help is appreciated</div><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Prof. Carlos Henrique Grohmann<br>Institute of Energy and Environment - Univ. of São Paulo, Brazil<div>- Digital Terrain Analysis | GIS | Remote Sensing - </div><div><br></div><div><a href="http://carlosgrohmann.com/" target="_blank">http://carlosgrohmann.com</a></div><div><a href="http://orcid.org/0000-0001-5073-5572" style="font-size:13px;color:rgb(17,85,204)" target="_blank">http://orcid.org/0000-0001-5073-5572</a><br><div>________________<br>Can’t stop the signal.</div></div></div></div>
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