ERSC 3P07 Lecture Notes - Lecture 9: Phenology, European Route E20, Torr
19 May 2016
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Document Summary
Active sensors provides their own energy source; thus, it can operate during the day or at night. Depending on , microwave energy can penetrate haze, cloud, smoke, light rain and now. No direct relationship with counterparts in visible part of the spectrum. Radar is an acronym for radio detection and ranging. Transmits short pulses (bursts) of microwave energy towards a scene of interest. Receives portion of the transmitted energy backscattered from the scene. Records the strength (detection) and the time delay (ranging) of the return signals within its. Great for equatorial regions (where persistent cloud limits acquisition of imagery from optical portion of the ems). Images can have very high spatial resolution (3-10 m). Different and complementary information compared to optical sensors. Some surface features can be seen better in radar images. Smooth targets (e. g. , calm water) appear as dark tones. Diffuse targets (e. g. , vegetation) appear as intermediate tones.
