Abstract

An airborne recording telephotometer with a field of view of three-minute diameter has been used in an extensive series of measurements of ground brightnesses as seen from an aircraft. Results are presented for a number of typical scenes. On brightness, these results confirm previous range values and show that, by reason of their frequencies, central values are more important than extreme values. On brightness differences, these results indicate that for small detail a typical difference of log brightness is 0.08. This is lower than previously believed.

© 1951 Optical Society of America

Brightness of Fine Detail in Ground Photography

P. D. Carman and H. Brown
J. Opt. Soc. Am. 49(6) 629-636 (1959)

New Criteria for Contact Printing in Aerial Photography*

L. E. Howlett and D. L. Matthews
J. Opt. Soc. Am. 41(11) 752-759 (1951)

The Brightness and Polarization of the Daylight Sky at Altitudes of 18,000 to 38,000 Feet above Sea Level

D. M. Packer and C. Lock
J. Opt. Soc. Am. 41(7) 473-478 (1951)

The Variation of Critical Fusion Frequency with Brightness at Various Retinal Locations*

Richard Thomas Brooke
J. Opt. Soc. Am. 41(12) 1010-1016 (1951)

Air Photography*

Duncan E. Macdonald
J. Opt. Soc. Am. 43(4) 290-298 (1953)