Physics – Optics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980spie..251...37w&link_type=abstract
In: Optical alignment; Proceedings of the Seminar, San Diego, CA, July 29-31, 1980. (A81-39578 18-74) Bellingham, WA, Society of
Physics
Optics
Alignment, Earth Observations (From Space), Foci, Imaging Techniques, Spaceborne Photography, Spaceborne Telescopes, Computer Techniques, Electro-Optics, Error Analysis, Image Motion Compensation, Landsat Satellites, Photomapping, Thematic Mapping
Scientific paper
The characteristics of false color imagery produced by instrumentation on earth resource mapping satellites are examined. The spatial fidelity of the imagery is dependent upon the geometric accuracy (GA) and the band-to-band registration (BBR) with which the telescope instrument is assembled. BBR and GA require knowledge of telescope effective focal length (EFL) to one part in 10,000 in order that the next generation of earth mappers be able to carry out their missions. The basis for this level of precision is briefly considered, and a description is given of the means by which such precise EFL measurements have been carried out. Attention is given to accuracy requirements, the technique used to measure effective focal length, possible sources of error in the EFL measurement, approaches for eliminating errors, and the results of the efforts to control measurement errors in EFL determinations.
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