[GRASSLIST:8662] ortho-rectification reference

[Dan Gavin]

I am looking for a general reference that addresses quality control 
of orthorectification.  We are currently orthorectifying many 
historical aerial photos that lack a detailed camera calibration 
report (we only know the focal length).  We are getting 
reasonable-looking results, but will still like to find some 
guidelines on the process.  Two immediate issues we have: 1) we have 
ca. 20% overlap using every 2nd photo in the flight line--is it 
imperative to orthorectify every photo? Seems like a lot of 'wasted' 
work due to high overlap. 2) we are not sure how to determine 
boundaries for patching adjacent overlapping photos.

Thanks,
Dan

-- 
Dan Gavin
Research Associate
University of Vermont
Botany and Agricultural Biochemistry
120B Marsh Life Science
109 Carrigan Dr.
Burlington, VT 05405-0086