----------------------------Original message----------------------------
At 03:26 PM 3/18/98 EST, Gary Hubbs wrote:
>----------------------------Original message----------------------------
>I'm looking for information and opinions on the use of small format (i.e.,
>not from a metric camera) aerial photography for mapping and map updating
>purposes.
>
>One of our (potential) clients is considering this for small-scale mapping,
>and I need some authoritative info to convince them that this is not a good
>idea.
 
If they're just going to enlarge the image and trace, and not be concerned
about image distortions, then metric photography is not going to give them
any compelling extra value. However, if they intend to do mapping from
stereo pairs (e.g. photogrammetry), they will probably need calibrated
photography (there are ways to derive camera geometry given stereo
photography and copious ground control, but you would only consider doing
this with, for example, historical photography). Photogrammetry is what I
do, so feel free to question me further!
 
-- Pat Dunlavey