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On 6/28/2012 11:12 AM, Gerardo Jimenez wrote:
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Hi
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<div>I made this one for my non english speaking students. </div>
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<div><a moz-do-not-send="true"
href="http://www.youtube.com/watch?v=_Durq2vpe3k&feature=plcp">http://www.youtube.com/watch?v=_Durq2vpe3k&feature=plcp</a> </div>
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<div>Hope it helps<br>
<br>
Gerardo Jiménez Delgado<br>
Instituto de Investigaciones Antropológicas<br>
Universidad Nacional Autónoma de México<br>
Ciudad Universitaria s/n<br>
Coyoacan 04510
Mexico City<br>
Mexico
56 22 95 16<br>
<br>
<div>> From: <a class="moz-txt-link-abbreviated" href="mailto:giovanni.manghi@faunalia.pt">giovanni.manghi@faunalia.pt</a><br>
> To: <a class="moz-txt-link-abbreviated" href="mailto:digitalmaps@cox.net">digitalmaps@cox.net</a><br>
> Date: Thu, 28 Jun 2012 10:56:29 +0100<br>
> CC: <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a><br>
> Subject: Re: [Qgis-user] Georefrencing paper map<br>
> <br>
> On Wed, 2012-06-27 at 16:46 -0500, . wrote:<br>
> > Is there a recommended georefrencing tutorial that
can explain how to<br>
> > locate a paper map in GIS?<br>
> <br>
> this video has just been updated on youtube<br>
> <br>
>
<a class="moz-txt-link-freetext" href="http://www.youtube.com/watch?v=IZUx-7wj0-U&feature=em-uploademail">http://www.youtube.com/watch?v=IZUx-7wj0-U&feature=em-uploademail</a><br>
> <br>
> but there are plenty of resources, see the qgis wiki<br>
> <br>
> <br>
> cheers<br>
> <br>
> -- Giovanni --<br>
> <br>
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Thanks. I managed to figure it out late last night. <br>
<br>
1) I open the scanned map in Gimp and place three reference dots
along the top edge, left, middle and right. I place two dots at 1/3
and 2/3 mark along bottom edge. This is the time to crop and rotate
the image as necessary. Also I reduce the DPI and image size as much
as possible to reduce the file size while sitll being readable.<br>
<br>
2) Then I open the marked file in Google Earth, position and scale
it and draw a polyline that connects the dots in a big "W" pattern
and save the W as a kml file.<br>
<br>
3) In QGIS I import the W file and georeference the marked file
using the properly positioned polyline.<br>
<br>
Easy peasy.<br>
<br>
B<br>
<br>
<br>
<br>
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