From Glossary of Meteorology
- The reference line in a measurement by triangulation.
In meteorological observations it has several applications, for example, 1) the horizontal distance from the observation point to the location of a ceiling-light projector; 2) the horizontal distance between a ceilometer projector and detector; and 3) the bearing, distance, and slope of the line between the observational points in a double-theodolite observation.
- In dual-Doppler analysis, the length and bearing of the line separating the radars.
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