proj4.defs("EPSG:5310","+proj=tmerc +lat_0=0 +lon_0=91.5666666666667 +k=1 +x_0=250000 +y_0=-2500000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs");