A new method is suggested for determining the characteristic curve of a plate, as well as the magnitude zero point, using PDS microdensitometer data of stars of known brightness on the plate.
We find that when we appropriately adjust downward the brightness, then the properties curve can be changed, and green, blue elements can be brought into their full play…
Sea ice thickness distribution along the flight line over Liudongwan Gulf and statistical curve relating brightness temperature to ice thickness are given.