04-Multispectral

04-Multispectral - 4/1416/2008 Radiation and remote sensing...

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4/14 16/2008 ESM 266: Multispectral remote sensing 1 ESM 266: Multispectral remote sensing Radiation and remote sensing For example, if energy being sensed comes from the Sun, it: is radiated by atomic particles at the source (the Sun) propagates through the vacuum of space at the speed of light 2 interacts with Earth's atmosphere interacts with Earth's surface interacts with Earth's atmosphere once again, and finally reaches our sensing system where it interacts with various optical systems, filters, emulsions, or detectors Atmospheric absorption and scattering emission 3 absorption scattering Relation between frequency and wavelength , so and speed of light, m/s wavelength m (but we often use m or nm) c c c c λυ υ λ λ υ λ μ = = = 4 -1 wavelength, m (but we often use frequency, Hz (s ) υ Sun glint and wildfires near Carpenteria Carpenteria Bay, Bay, Queensland, Australia
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