Central meridian

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As central meridian or length origin in the will geodesy the reference line of two available modes Cartesian coordinate system refers to that in cartography and geography is used. Either the longitude of a local fundamental point or whole-number longitudes in a defining system such as GK or UTM , cf. Examples.

For the central meridian (blue line in the figure), a right value ( false easting ) ≠ 0 is set in the respective coordinate system such that the ordinate with the right value 0 does not mark the central meridian , but lies west of the area shown (green perpendicular). This avoids negative coordinate values west of the central meridian.

Examples

with false easting in meters:

Central meridian is the longitude of a local fundamental point
- Swiss national coordinates , Old Bern Observatory, "Berner Meridian", (600,000 right / 200,000 high),
- Soldner cadastre Berlin, Müggelturm , 13 ° 37 '30 "East, (40,000 right / 10,000 high)
Central meridian is an integral longitude
- Austrian federal registration network with three zones
  - 10 ° 20 'East, 150,000 right
  - 13 ° 20 'East, 450,000 right
  - 16 ° 20 'East, 750,000 right
- German Gauß-Krüger coordinate system , all divisible by three eastern longitudes (3 ° East, 6 ° East, ...), each 500,000 on the right
- Finnish YKJ coordinate system , 27 ° East, 3,500,000 right
- UTM coordinate system , all after adding 3 degrees of longitude divisible by 6 (3 ° East, 9 ° East, ...), each 500,000 to the right.

Central meridian

Examples

See also