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Re: Re Film-based depolarisation and ghosting

  • From: P3D <CJMCE@xxxxxxxxxxxxxxxx>
  • Subject: Re: Re Film-based depolarisation and ghosting
  • Date: Thu, 05 Jun 1997 08:54:20 -0600 (CST)
Aerial photogrammetric cameras have "Fiducial" markers built into the lens
cone of the camera, and these physical markers are used, among other things,
to allow compensation of film shrinkage.  Over the decades, lots of papers 
have been published on general equations to correct for film shrinkage.
I am unaware of anything regarding specific directions as a function of age
for any type of polyester base or (ancient) acetate base.

The closest thing to specific directions is by Professor Sprinsky at Texas A&M,
and if I remember the conversation, he said it was for dimensional changes in
paper...  I think he told me that back in 1987 or 1988 in Austin.

Clifford J. Mugnier  (cjmce@xxxxxxx)
Topographic Engineering Laboratory
Department of Civil & Environmental Engineering
University of New Orleans
New Orleans, Louisiana  70148
Voice: (504) 280-7095
FAX:         280-7095


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