Krovak¶

Classification	Conformal Conical
Available forms	Forward and inverse, spherical and ellipsoidal
Defined area	Global, but more accurate around Czech Republic and Slovakia
Alias	krovak
Domain	2D
Input type	Geodetic coordinates
Output type	Projected coordinates

By default, coordinates in the forward direction are output in easting, northing, and negative in the Czech Republic and Slovakia, with absolute value of easting/westing being smaller than absolute value of northing/southing.

See also Modified Krovak for a variation of Krovak used with the S-JTSK/05 datum in the Czech Republic.

Note

Before PROJ 9.4, using other values for x_0 or y_0 than the default 0 would lead to incorrect results when not using the +czech switch.

Parameters¶

Note

All parameters are optional for the Krovak projection.

The latitude of pseudo standard parallel is hardcoded to 78.5° and the ellipsoid to Bessel.

+czech¶: Reverse the sign of the output coordinates, as is tradition in the Czech Republic, to be westing, southing (positive values in Czech Republic and Slovakia).

+lon_0=<value>¶

Longitude of projection center.

Defaults to 24°50' (24.8333333333333)

+lat_0=<value>¶

Latitude of projection center.

Defaults to 49.5

+k_0=<value>¶

Scale factor. Determines scale factor used in the projection.

Defaults to 0.9999

+x_0=<value>¶

False easting, easting at false origin or easting at projection centre (naming and meaning depend on the projection method). Always in meters.

Defaults to 0.0.

+y_0=<value>¶

False northing, northing at false origin or northing at projection centre (naming and meaning depend on the projection method). Always in meters.

Defaults to 0.0.