An imaginary line, generally following the meridian of longitude lying 180 degrees east and west of the Greenwich meridian, where the date changes.
the standard line runs along a meridian of longitude. The effect is to minimize distortion in a narrow strip running pole to pole.
UTM divides the earth into pole-to-pole zones 6 degrees of longitude wide.
There is a false origin defined at 400,000, -100,000 such that the central meridian is the Zero easting of the National Grid - which is also aligned to the 2 degree West meridian of Longitude. Additionally, the scale along the central meridian is 0.
of reference; b = polar radius or semi-minor axes of the ellipsoid of reference; e = eccentricity of the ellipsoid; f = flattening of the ellipsoid; ho = scale factor at central meridian; h = relative scale factor along a meridian of longitude; ...
prime meridian Meridian of longitude 0 degrees, used as the origin for measurements of longitude. The meridian of Greenwich, England, is the internationally accepted prime meridian on most charts.
A transverse cylindric projection uses a meridian of longitude as its central meridian. travelling salesman problem p.
 See also: Meridian, Survey, Surface, Projection, Object
  
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