Thank you so much for your response! The resources you linked to were very useful. The Erdas paper is especially good. I never heard of MapAnalyst. I will have to give it a try. <br><br>Unfortunately, the focal length of the camera is not on the photo border. The photo must be too old. Do you have any recommendations on what focal length I should try? It was taken in 1939 for the USDA Agricultural Adjustment Administration. If it would help, I could send the image file. It is about 7 mb in size.<br>
<br>I was using photo2.image as part of the i.ortho.photo UI when I was having the problems. It may be because I am using GIS-Knoppix. If I use GIMP to measure the fiducial mark coordinates, do I still need to use photo2.image or do I just use photo.camera?<br>
<br>Thanks!<br><br>Shaun<br><br><div class="gmail_quote">On Sun, Apr 6, 2008 at 6:18 AM, Maciej Sieczka <tutey@o2.pl> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Shaun & Melissa Busler pisze:<div class="Ih2E3d"><br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
1) When is i.ortho.photo going to be available for the Windows binaries?<br>
</blockquote>
<br></div>
Dunno. It currently depend on X displays, not easily portable to else than Unix.<div class="Ih2E3d"><br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
2) The historic aerial photos do not have camera calibration files. I have<br>
searched all over and they do not seem to exist anymore. Is there a way to<br>
orthorectify the images without the camera calibration files? Can I make<br>
some assumptions? If so, what parameters should I enter?<br>
</blockquote>
<br></div>
If the DPI at which photos have been scanned is known to you, you can measure the principal point and fiducial marks coordinates in any image editing software, like GIMP. Interior orientation results will depend on how close is the geometry of the image plane to the geometry of camera's optical system, and if/how the photo scan is distorted.<br>
<br>
Idea, not tested: you might try using software like MapAnalyst [1] to asses the distortion of the image, which can help you guessing genuine fiducial marks coordinates.<br>
<br>
Then you need the focal length. It often is present on the photo border. Or guess it :).<div class="Ih2E3d"><br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
3) When I tried using photo.2image, I was not prompted with "Look ok?<br>
(Y/N)" so I was not able to mark the fiducials.<br>
</blockquote>
<br></div>
photo.2image is not supposed to be used standalone. i.ortho.photo is the UI for photo.2image & friends.<br>
<br>
There's plenty of info you might find usefull on the net. eg. [2] [3].<br>
<br>
[1]<a href="http://mapanalyst.cartography.ch" target="_blank">http://mapanalyst.cartography.ch</a><br>
[2]<a href="http://support.erdas.com/focus3/files/Aerial_photo.pdf" target="_blank">http://support.erdas.com/focus3/files/Aerial_photo.pdf</a><br>
[3]<a href="http://www.pcigeomatics.com/services/support_center/faqs/oe_general_v10.html#no_fiducial" target="_blank">http://www.pcigeomatics.com/services/support_center/faqs/oe_general_v10.html#no_fiducial</a><br>
</blockquote></div><br>