grey level A calibrated sequence of grey tones, ranging from black to white. In remote sensing, electromagnetic radiation falling on a photosensitive receiver generates an electrical current proportional to the intensity of the radiation. The receiver is usually tuned to specific wavelength bands and the signal from each receiver is amplified and its intensity classified into different levels, usually 0 (black) to 256. These are the digital numbers of each of the pixel units that together make up a remotely sensed frame. In multi-spectral scanning systems, the digital numbers are classified into grey-scale bands, of which there are usually 10 to 12, but up to 256 shades of grey (brightness) may be used.
More From encyclopedia.com
Decibel , decibel •Adele, Aix-la-Chapelle, aquarelle, artel, au naturel, bagatelle, béchamel, befell, bell, belle, boatel, Brunel, Cadell, carousel, cartel, ce… Band , band, in music, a group of musicians playing principally on wind and percussion instruments, usually outdoors. Prior to the 18th cent., the term band… Brass Band , brass bands are wind bands comprising brass instruments, sometimes with percussion, as opposed to military bands which mix brass and woodwind. The st… intensity , in·ten·si·ty / inˈtensitē/ • n. (pl. -ties) 1. the quality of being intense: gazing into her face with disconcerting intensity the pain grew in inten… Trochophore , trochophore In several invertebrates (including Polychaeta and Mollusca), a ciliated, usually planktonic larva. The larva is almost spherical, with a… Atmospheric Convection , condensation level The atmospheric level at which condensation occurs as a result of convection, the lifting of air (e.g. orographic lifting), or ver…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like