base line

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base line:

see geodesygeodesy
or geodetic surveying,
theory and practice of determining the position of points on the earth's surface and the dimensions of areas so large that the curvature of the earth must be taken into account.
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base line

[′bās ‚līn]
Abbreviated BL.
(electronics)
The line traced on amplitude-modulated indicators which corresponds to the power level of the weakest echo detected by the radar; it is retraced with every pulse transmitted by the radar but appears as a nearly continuous display on the scope.
(engineering)
A surveyed line, established with more than usual care, to which surveys are referred for coordination and correlation.
A cardinal line extending east and west along the astronomic parallel passing through the initial point, along which standard township, section, and quarter-section corners are established.
(graphic arts)
The bottom alignment of upper-case letters in a font.
(navigation)
The geodesic line joining the two stations between which electrical phase or time is compared in determining navigational coordinates.
(science and technology)
A line drawn in the graphical representation of a varying physical quantity, such as a voltage or current, to indicate a reference value, such as the voltage value of a bias.

base line

A surveyed line which has been established with more than usual care, and to which surveys are referred for coordination and correlation.