KŘOVÁK’S PROJECTION AND ITS USE FOR THE CZECH REPUBLIC AND THE SLOVAK REPUBLIC

Křovák’s projection (named according to its author Ing. Josef Křovák), its history, mathematical principles and usage for the Czech Republic and the Slovak republic. The coordinate system S-JTSK and conformal oblique projection used for former Czechoslovakia. Conformal projection of the Bessel ellipsoid to the Gauss sphere, change from geographic to cartographic coordinates on the Gauss sphere and its conformal projection to the oblique tangent cone. Projection of cone to grid plane S-JTSK. Geographical calculator MATKART for coordinate transformations. 1. Czech/Slovak coordinate system S-JTSK S-JTSK: plane geodetic grid coordinate system called in Czech “Systém Jednotné trigonometrické sítě katastrální (The System of the Unified Czech/Slovak Trigonometric Cadastral Network)”. 1.1 History Scale, location and orientation of the S-JTSK on the surface of the Bessel ellipsoid was derived from the results of the historical Austro/Hungarian military surveys in the years 1862-98. There are 42 identical points on the Czech territory used for transformation computations. Astronomical orientatio