proj4 = '+proj=tmerc +lat_0=-44 +lon_0=171.5 +k=1 +x_0=457199.207308015 +y_0=457199.207308015 +ellps=intl +nadgrids=nzgd2kgrid0005.gsb +to_meter=0.914398414616029 +no_defs +type=crs'
m = Map(256,256,proj4)
lyr = Layer('Name',proj4)