Gábor TIMÁR, Martin DANIŠÍK

Aproximácia Křovákovho zobrazenia Lambertovým konformným kužeľovým zobrazením na území Slovenska pre potreby GIS a GPS

Timár, G., Danišík, M.: Approximation of the Křovák Projection with the Lambert Conformal Conic Projection in the GIS and GPS Applications on the Territory of Slovakia. Kartografické listy, 2003, 11, 4 refs.

Abstract: The Křovák projection, an oblique conformal conic (OCC) one, is unique among the world’s national grids. Many GIS sofiwares simply don’t contain it. Therefore in these packages, the Kfovák grid coordinates cannot be implemented with exact accuracy. However, an approximation is given in this paper, appropriate for all GIS packages and for some GPS receivers. This substitute grid is based on the Lambert Conformal Conic (LCC) projection, whose parameters are also given here. The difference of the standard Křovák and the substitute LCC grid values are averagely 6 meters, maximum 12 meters, throughout Slovakia. This moderate accuracy enables to use the substitute grid for most GIS and some topographic purposes. The approximation is not valid for the Czech Republic, where a similar LCC grid can be defined only with significantly higher errors.

Keywords: Křovák grid, Lambert conformal conic projection, GIS integration