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.

The records get better after the early 1940's.  For some reason, they do not
have any information for these early aerial photos.

Thanks!

Shaun

On Thu, Apr 10, 2008 at 2:46 PM, Patton, Eric <[EMAIL PROTECTED]> wrote:

> >May it be a stupid suggestion, but did you try to contact anyone at the
> >USGS ? perhaps they maintain data from these old times... (here in
> >France IGN is always helpful, and can provide answers to such historical
> >requests)
> >
> >Vincent.
>
> Similarly in Canada, provincial Department of Natural Resources frequently
> maintain documents from the original flight transects, sometimes going
> back
> several decades. I've managed to recover much aerial photo detail by
> contacting
> these agencies, including fiducial mark coordinates, camera make and focal
> length,
> aircraft altitude, lens type, etc.
>
> It's probably just a matter of tracking down the right federal agency to
> contact.
>
> ~ Eric.
>
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