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・ Low poly
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・ Low rate initial production
Low Rate Picture Transmission
・ Low Redford Meadows
・ Low Reef
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・ Low Rigg
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Low Rate Picture Transmission : ウィキペディア英語版
Low Rate Picture Transmission
The Low Rate Picture Transmission (LRPT) is a digital transmission system, intended to deliver images and data from an orbital weather satellite directly to end users via a VHF radio signal. It is used aboard polar-orbiting, near-Earth weather satellite programs such as MetOp and NPOESS.
==Purpose==
LRPT provides three image channels at full sensor resolution (10-bit, 1 km/pixel, six lines/second) in addition to data from other sensors, such as atmospheric sounders and GPS positioning information.
The system is an update and replacement of the existing analog system called Automatic Picture Transmission (APT), which has been used since the 1960s aboard NOAA's TIROS polar-orbiting satellites. The APT system provided only two image channels, which were at a reduced accuracy and resolution (8-bit, 4 km/pixel, two lines/second). Compared to the APT system, LRPT images are four times more accurate and contain twelve times the resolution. Further, the additional data from other sensors increases the applications of the satellites and the users who receive the signal.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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