I wish the same was the case for the US for this period of aerial photos. I have tracked down the location of the photos to the National Archives and they do not have the calibration reports. Prior to the archives the USDA was responsible for the photos; however, they sent "everything" they had to the Archives. The USGS could provide me a calibration report if I knew the type of camera or serial number of the camera lens, but I do not have that either. I even tried talking to the contractor who took the photos since they are still around, but they do not have any files prior to the 1970's. <br>
<br>The records get better after the early 1940's. For some reason, they do not have any information for these early aerial photos.<br><br>Thanks!<br><br>Shaun<br><br><div class="gmail_quote">On Thu, Apr 10, 2008 at 2:46 PM, Patton, Eric <<a href="mailto:epatton@nrcan.gc.ca">epatton@nrcan.gc.ca</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="Ih2E3d">>May it be a stupid suggestion, but did you try to contact anyone at the<br>
>USGS ? perhaps they maintain data from these old times... (here in<br>
>France IGN is always helpful, and can provide answers to such historical<br>
>requests)<br>
><br>
>Vincent.<br>
<br>
</div>Similarly in Canada, provincial Department of Natural Resources frequently<br>
maintain documents from the original flight transects, sometimes going back<br>
several decades. I've managed to recover much aerial photo detail by contacting<br>
these agencies, including fiducial mark coordinates, camera make and focal length,<br>
aircraft altitude, lens type, etc.<br>
<br>
It's probably just a matter of tracking down the right federal agency to contact.<br>
<font color="#888888"><br>
~ Eric.<br>
</font></blockquote></div><br>