proj4.defs("EPSG:27231","+proj=tmerc +lat_0=-45.8615133611111 +lon_0=170.282589111111 +k=0.99996 +x_0=300000 +y_0=700000 +ellps=intl +nadgrids=nzgd2kgrid0005.gsb +units=m +no_defs +type=crs");