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<div class="moz-cite-prefix">Jeff,<br>
<br>
Depending on the topography (relief variations over the area
covered) and photoscale you will probably have to cope with both
relief and radial displacements - assuming you are not using
orthophotos. Ideal situation for good georeferencing of standard
aerial photos would be flat ground and a large photoscale.<br>
<br>
Regards,<br>
Mike<br>
<br>
On 16/11/2016 11:06, Aslam Parker wrote:<br>
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi
Jeff<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">My
colleague Muhammed Deal <a class="moz-txt-link-rfc2396E" href="mailto:Muhammed.Deal@drdlr.gov.za"><Muhammed.Deal@drdlr.gov.za></a>
has a tutorial that he can send you, we do this all the time
on QGIS.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Please
take note that if you do a georeferencing by common points,
this amounts to rubbersheet/transformation and does not
create an orthorectified imagery and the georeferencing will
be approximate.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="EN-US"> Africa [<a class="moz-txt-link-freetext" href="mailto:africa-bounces@lists.osgeo.org">mailto:africa-bounces@lists.osgeo.org</a>]
<b>On Behalf Of </b>Jeff Ngwane<br>
<b>Sent:</b> 16 November 2016 12:17 PM<br>
<b>To:</b> Africa local chapter discussions<br>
<b>Subject:</b> [OSGeo Africa] Georeferencing or overlaying
old aerial photograph with cadastre<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">How to correctly georeference old
aerial photograph (i.e 1972) for purpose of being aligned
with up to date cadastre on QGIS recent versions? I have
been trying but in vain. Please help me.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thank<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Jeff <o:p></o:p></p>
</div>
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