proj4 = '+proj=krovak +axis=swu +lat_0=49.5 +lon_0=24.8333333333333 +alpha=30.2881397527778 +k=0.9999 +x_0=0 +y_0=0 +ellps=bessel +towgs84=559,68.7,451.5,7.92,4.073,4.251,5.71 +units=m +no_defs +type=crs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)