SK-42 reference system

The SK-42 reference system is a geodetic datum established in the Soviet Union in 1942 as Systema koordinat (Russian: Система координат 1942 года). It was used in geodetic calculations, notably in military mapping and determining state borders.

SK-42 is based on the Krasovsky 1940 ellipsoid, a locally best fitting reference ellipsoid named after Feodosy Krasovsky. It has a semi-major axis (equatorial radius) $a$ of 6,378,245 m, and an inverse flattening $1/ f$ of 298.3 ¹²^: 220

SK-42 served as a foundation for developing the SK-63 reference system which was created and used primarily for civilian and industrial development purposes.¹ It was later linked to the geocentric coordinate system PZ-90 via a datum transformation.¹

Citations and notes

E.M. Mazurova; S.M. Kopeikin; A.P. Karpik (2017). "Development of a terrestrial reference frame in the Russian Federation". Studia Geophysica et Geodaetica. 61 (4): 616–638. Bibcode:2017StGG...61..616M. doi:10.1007/s11200-015-1106-4. S2CID 133884317.
Office, United States Naval Observatory Nautical Almanac; Office, Great Britain Nautical Almanac (2005). Explanatory Supplement to the Astronomical Almanac. University Science Books. ISBN 9781891389450.

[mazurova-1] E.M. Mazurova; S.M. Kopeikin; A.P. Karpik (2017). "Development of a terrestrial reference frame in the Russian Federation". Studia Geophysica et Geodaetica. 61 (4): 616–638. Bibcode:2017StGG...61..616M. doi:10.1007/s11200-015-1106-4. S2CID 133884317.

[2] Office, United States Naval Observatory Nautical Almanac; Office, Great Britain Nautical Almanac (2005). Explanatory Supplement to the Astronomical Almanac. University Science Books. ISBN 9781891389450.

1

2