Anne-
Sorry for the late reply to photogrammetry query, I've been outta town. Try:
IAT Innovative Architectural Technologies, 191 Wooster St, New Haven CT
203 562 9910
Frazier Associates, 213 Augusta St., Staunton, VA 540 886 6230
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Rollei promotes a hardware/software package with which (with a moderate
understanding of photography and drawing) you can get started. The cost is,
as I remember about $40K minimum for the stuff.
There is a company in Switzerland marketing "ELCOVISION" software with which
you can plot from photographic images.
PMS AG
Bahnhofstrasse 8
St. Margrethen, Switzerland
41(71) 717091
Carry On!
M. Devonshire