Flight azimuths

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A flight azimuth is used to indicate linear distance or image scale in the direction parallel to the radar's path of flight. It is also used to determine distance when a pilot looks to the horizon and the sky, he can use the angles to determine the correct distance to his destination. In an image, azimuth is also known as along-track direction, since it is the relative along-track position of an object within the antenna's visibilty range following the radar's line of flight. Azimuth is mainly used in radar terminology. The azimuth direction is perpendicular to range direction. continuous and independent of the range.

an azimuth line

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[edit] Sources

http://envisat.esa.int/dataproducts/asar/CNTR5-5.htm#eph.asar.gloss.geo:BEAMWIDTH