GEOG 2420 Chapter Notes - Chapter 12: Nexrad, Urban Runoff, Radiometer
7 Dec 2013
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Document Summary
Water covers approximately 74% of the earth"s surface. Remote sensing can be used to inventory and monitor spatial extent, organic/inorganic constituents, depth and temperature of water. The total radiance (lt) recorded by the sensor onboard the aircraft or satellite is a function of the electromagnetic energy from the four sources: Lp is the portion of radiance recovered by a remote sensing instrument resulting from the downwelling solar and sky radiation that never actually reaches the water surface. Ls is the radiance from the downwelling solar and sky radiation that reaches the air water interface (free surface layer) but only penetrates it a millimetre or so and then is essentially reflected from the water surface. Lv is the radiance that actually penetrates the air water interface, interacts with the water and organic/inorganic constituents and then exits the water column without encountering the bottom. Spectral response of water as a function of wavelength.
