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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Hi Markus, Florian, and others,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Thanks for your replies. I still did not solve this, so I am grateful for any hint.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Now, I extracted the relevant data (XY-location containing the mapset (“reconyx”) with the image group (containing i.ortho.photo
files), and camera file as well as the target location (“ETRS_32N”) with the “target” mapset containing the DEM (“dem_1m”) and two of my attempts for orthorectification (with and without INIT file active). You can fetch the zip-file with the GRASS DB (22
MB) within the next 30 days from:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">https://www.dropbox.com/sh/swri19zn5m9gb7w/AACADlkqGZKO_JMS_YbLNXBXa?dl=0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">There you will also find the original image (“IMG_0015.jpg”) as it comes from the camera.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">As a next step I will take another test image with a more orthophoto-like perspective and no visible sky. I hope, that
way I can check whether the issue is due to the chosen camera position / angle or the way I defined the exposure in the INIT file…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">I have a strong feeling that my problems - in one or the other way - have to do with camera angles…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Unfortunately, it does not seem to be possible to specify only the exposure parameters one is sure about. i.photo.rectify
uses either all or nothing to initialize the orthorectification algorithm…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US">Stefan<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> grass-user-bounces@lists.osgeo.org [mailto:grass-user-bounces@lists.osgeo.org]
<b>On Behalf Of </b>Florian Mueller<br>
<b>Sent:</b> 15. august 2015 20:54<br>
<b>To:</b> grass-user grass-user (grass-user@lists.osgeo.org)<br>
<b>Subject:</b> Re: [GRASS-user] Orthorectification of tilted digital camera images<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Dear Stefan,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can you provide some example photos in a Dropbox (e.g.) folder? <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best regards,<o:p></o:p></p>
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<p class="MsoNormal">Florian<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Sat, Aug 15, 2015 at 7:53 PM, Markus Neteler <<a href="mailto:neteler@osgeo.org" target="_blank">neteler@osgeo.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">On Tue, Aug 11, 2015 at 11:37 PM, Blumentrath, Stefan<br>
<<a href="mailto:Stefan.Blumentrath@nina.no">Stefan.Blumentrath@nina.no</a>> wrote:<br>
> Dear all,<br>
><br>
> Although there is a lot of relevant information regarding the<br>
> orthorectification of tilted digital camera images in GRASS GIS online<br>
> (here:<br>
...<br>
> Does up-slope direction of the photo or sky in the photo conflict with the<br>
> orthorectification algorithm?<br>
<br>
I have no idea... in general the algorithm is very robust but was<br>
really written for aerial photos.<br>
<br>
><br>
> When it comes to the GCPs I am in principle quite confident that they are<br>
> placed OK. Or do you think that GCPs measured by a hand held GPS are too<br>
> imprecise?<br>
<br>
They should be fine.<br>
<br>
> However, depending on initial camera settings RMS something like 268, which<br>
> indicates that something is wrong here. If I do not use i.photo.init, the<br>
> image is placed much better (RMS around 10-20), but still pretty poor…<br>
<br>
About 10 years have passed that I tried the last time, memory is fading...<br>
<br>
Did you figure it out?<br>
<br>
...<br>
> Btw: Some of the submodules of i.ortho.photo are not linked to the /bin<br>
> folder in GRASS 6.4.5svn, so I have to start them like this:<br>
> /usr/local/grass-6.4.5svn/etc/i.photo.init<br>
<br>
To my knowledge they are intentionally hidden in order to be run from<br>
the i.ortho.photo main menu (in GRASS GIS 6).<br>
<br>
Markus<br>
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<p class="MsoNormal"><o:p> </o:p></p>
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