CEE 4221 Lecture Notes - Lecture 2: Electromagnetic Spectrum, Remote Sensing Systems, Radiance

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(cid:1) (cid:1)(cid:2)(cid:3)(cid:4)(cid:5)(cid:6)(cid:7)(cid:8)(cid:9)(cid:10)(cid:11)(cid:3)(cid:5)(cid:12)(cid:4)(cid:13)(cid:1)(cid:11)(cid:3)(cid:6)(cid:10)(cid:14)(cid:15)(cid:13) (cid:1) emr spectrum : distribution of the continuum of energy plotted as a function of wavelength (or frequency) (cid:1) Cameras and scanners (cid:1) platform: a vehicle used to carry the sensor. Aircrafts and satellites (cid:1) (cid:21)(cid:5)(cid:9)(cid:10)(cid:3)(cid:18)(cid:13)(cid:12)(cid:11)(cid:13)(cid:20)(cid:3)(cid:8)(cid:7)(cid:5)(cid:3)(cid:13)(cid:21)(cid:3)(cid:11)(cid:18)(cid:12)(cid:11)(cid:10)(cid:13) (cid:1) (cid:16)(cid:9)(cid:18)(cid:18)(cid:12)(cid:22)(cid:3)(cid:23)(cid:13)(cid:24)(cid:4)(cid:5)(cid:12)(cid:22)(cid:3)(cid:13)(cid:20)(cid:3)(cid:8)(cid:7)(cid:5)(cid:3)(cid:13)(cid:21)(cid:3)(cid:11)(cid:18)(cid:12)(cid:11)(cid:10)(cid:13)(cid:13) Energy emitted by the earth etc. (cid:1) most of the remote sensing systems work in passive mode using solar energy. Solar energy reflected by the targets at specific bands are recorded using sensors. For ample signal strength received at the sensor, wavelengths capable of traversing through the atmosphere without significant loss, are generally used (cid:1) the earth will also emit some radiation since its ambient temperature is about 300o k. Passive sensors can also be used to measure the earth"s radiance. Pulses of microwave signals are sent towards the target from the radar antenna located on the air / space-borne platform.

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