proj4 = '+proj=tmerc +lat_0=42.5 +lon_0=-72.5 +k=0.999964286 +x_0=500000 +y_0=0 +ellps=GRS80 +nadgrids=SK83-98.gsb +units=m +no_defs +type=crs' m = Map(256,256,proj4) lyr = Layer('Name',proj4)