Křovák's projection or simply Krovak is a conic projection invented in 1922 by Czech geodesist Josef Křovák. The projection is based on Bessel ellipsoid and it was calculated as the optimal projection of

Czechoslovakia Czechoslovakia ( ; Czech language, Czech and , ''Česko-Slovensko'') was a landlocked country in Central Europe, created in 1918, when it declared its independence from Austria-Hungary. In 1938, after the Munich Agreement, the Sudetenland beca ...

(in its interwar extent including Carpathian Ruthenia). It is still in use as national grids for civil state maps of the

Czech Republic The Czech Republic, also known as Czechia, and historically known as Bohemia, is a landlocked country in Central Europe. The country is bordered by Austria to the south, Germany to the west, Poland to the northeast, and Slovakia to the south ...

and

Slovakia Slovakia, officially the Slovak Republic, is a landlocked country in Central Europe. It is bordered by Poland to the north, Ukraine to the east, Hungary to the south, Austria to the west, and the Czech Republic to the northwest. Slovakia's m ...

. The corresponding coordinate system is abbreviated S-JTSK (for ''Systém Jednotné trigonometrické sítě katastrální'', "the Unified cadastral trigonometric network System"), code 5514. The projection has been deliberately made so that for any point located in former Czechoslovakia, the X coordinate may be always bigger (in absolute value) than Y. This makes easy to distinguish the coordinates even when transformed into another quadrant.

References

External links

* . Research Institute of Geodesy, Topography and Cartography. Map projections {{Map-stub