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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hei Dugal,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">g.gui.image2target generates the “CONTROL_POINTS” file (I guess in the folder of the image group).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US">If you want to skip
</span><span lang="EN-US">g.gui.image2target, you have to create that file a different way.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Here is one possible way:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Just create a random list of GCPs in g.gui.image2target to see how the file should look like and then re-create it with the GCPs you have (e.g. in a script or however your workflow is).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Stefan</span><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> grass-user <grass-user-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Dugal Harris<br>
<b>Sent:</b> fredag 16. april 2021 12:42<br>
<b>To:</b> grass-user@lists.osgeo.org<br>
<b>Subject:</b> [GRASS-user] Orthorectification without GCPs<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Good day<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I wonder if anyone could help with this... I am new to GRASS and am trying to orthorectify aerial images. I have accurate camera exterior orientations already, so want to skip the manual g.gui.image2target step in
<a href="https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgrass.osgeo.org%2Fgrass78%2Fmanuals%2Fi.ortho.photo.html&data=04%7C01%7C%7Cca2636775ccc4376985608d900c45023%7C6cef373021314901831055b3abf02c73%7C0%7C0%7C637541665708352737%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=15nnQq5kaVnA7%2FiQoGrcF%2F4qf1jOuJnxeYJpuES%2BZE0%3D&reserved=0">
https://grass.osgeo.org/grass78/manuals/i.ortho.photo.html</a>, and just apply the exterior orientation as is. Is this possible?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">If I run i.ortho.rectify without that step, I get: <o:p></o:p></p>
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<p class="MsoNormal">WARNING: Unable to find file [CONTROL_POINTS] of group [3318D_2016_1143_07_0315_RGB_NoRotate@NGI_3318DD_Ortho_Test in NGI_3318DD_Ortho_Test]<br>
WARNING: unable to open control point (Z) file for group [3318D_2016_1143_07_0315_RGB_NoRotate@NGI_3318DD_Ortho_Test in NGI_3318DD_Ortho_Test]<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you<o:p></o:p></p>
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<p class="MsoNormal">Dugal<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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