By Paul M. Mather
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Additional resources for Computer Processing of Remotely-Sensed Images: An Introduction
15. The total radiant energy emitted by a 14 Remote sensing: basic principles blackbody is dependent on its temperature, and as temperature increases the wavelength at which the maximum spectral exitance is achieved is reduced. 15 joins the peaks of the spectral exitance curves. 15 Spectral exitance curves for blackbodies at temperatures of 1000, 1600 and 2000 K. The dotted line joins the emittance peaks of the curves and is described by Wien’s displacement law (see text). 6697 × 10−8 W m−2 K−4 .
Thus, the orbit selected for a particular satellite determines not just the time taken to complete one orbit (which is one of the factors inﬂuencing temporal resolution) but also the nature of the relationship between the satellite and the solar illumination direction. The temporal resolution is also inﬂuenced by the swath width, which is the length on the ground equivalent to one scan line. Landsat TM/ETM+ has a swath width of 185 km whereas the AVHRR sensor carried by the NOAA satellites has a swath width of approximately 3000 km.
Determines the observed roughness of the surface, in that a surface that has a roughness with a frequency less than that of the microwave radiation used by the radar is seen as smooth. An X-band (c. W. 14. 4. Beyond the microwave region is the radio band. Radio wavelengths are used in remote sensing, but not to detect Earth surface phenomena. Commands sent to a satellite utilise radio wavelengths. Image data is transmitted to ground receiving stations using wavelengths in the microwave region of the spectrum; these data are recorded on the ground by high-speed tape-recorders while the satellite is in direct line of sight of a ground receiving station.
Computer Processing of Remotely-Sensed Images: An Introduction by Paul M. Mather