GEOG 3420 Lecture 1: GEOG3420 All Lectures
21 Oct 2017
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Document Summary
We can compute the dominant wave length based on wein"s displacement law. Therefore the sun"s dominate wavelength is about 0. 48 um. All passive rs systems measure emr that is radiated by atomic particles at the source (sun) Travels through the vacuum of space at the speed of light. Interacts with the earth"s atmosphere once again, and finally reaches the remote sensor, where it interacts with various optics, filters, film emulsion, or detector. Incident energy is bent from its normal trajectory as it travels from one atmospheric layer to another (refraction) The way in which we calculate the amount of refraction. Rayleigh: most problematic (the reason our sky is blue) Scattering from objects that are much smaller than what is being scattered. Shorter wavelengths get scattered to a greater degree. Result of things that are roughly the same size as the wavelengths. Non-selective (scatters all wavelengths equally): somewhat washed out. Larger than the wavelengths of light being detected.
