Modified Krovak

Added in version 9.4.0.

Classification	Conical
Available forms	Forward and inverse, spherical and ellipsoidal
Defined area	Czech Republic
Alias	mod_krovak
Domain	2D
Input type	Geodetic coordinates
Output type	Projected coordinates

Modified Krovak builts upon traditional Krovak, with corrective terms that are better suited when using it with the S-JTSK/05 datum. This method is specific to the Czech Republic. Due to the corrective terms, this projection method is no longer strictly conformal.

By default, coordinates in the forward direction are output in easting, northing, and negative in the Czech Republic, with absolute value of easting/westing being smaller than absolute value of northing/southing. To distinguish it from regular Krovak, the usual value for +x_0 and +y_0 in Modified Krovak is typically 5,000,000.

Parameters

Note

All parameters are optional for the Modified 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)

+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.