{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"CompoundCRS","name":"MRH21 Grid + ODN height","components":[{"type":"ProjectedCRS","name":"MRH21 Grid","base_crs":{"type":"GeographicCRS","name":"MRH21-IRF","datum":{"type":"GeodeticReferenceFrame","name":"MRH21 Intermediate Reference Frame","ellipsoid":{"name":"GRS 1980","semi_major_axis":6378137,"inverse_flattening":298.257222101}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"id":{"authority":"EPSG","code":9866},"remarks":"Intermediate CRS created in 2021 to assist the emulation of the ETRS89 / MRH21 SnakeGrid projected CRS through transformation ETRS89 to MRH21-IRF (1) (code 9867) used in conjunction with the MRH21-TM map projection (code 9868)."},"conversion":{"name":"MRH21-TM","method":{"name":"Transverse Mercator","id":{"authority":"EPSG","code":9807}},"parameters":[{"name":"Latitude of natural origin","value":52.3,"unit":"degree","id":{"authority":"EPSG","code":8801}},{"name":"Longitude of natural origin","value":-1.8,"unit":"degree","id":{"authority":"EPSG","code":8802}},{"name":"Scale factor at natural origin","value":1,"unit":"unity","id":{"authority":"EPSG","code":8805}},{"name":"False easting","value":227286.9881,"unit":"metre","id":{"authority":"EPSG","code":8806}},{"name":"False northing","value":265751.2874,"unit":"metre","id":{"authority":"EPSG","code":8807}}]},"coordinate_system":{"subtype":"Cartesian","axis":[{"name":"Easting","abbreviation":"E","direction":"east","unit":"metre"},{"name":"Northing","abbreviation":"N","direction":"north","unit":"metre"}]}},{"type":"VerticalCRS","name":"ODN height","datum":{"type":"VerticalReferenceFrame","name":"Ordnance Datum Newlyn"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":"metre"}]}}],"scope":"Engineering survey and topographic mapping for railway applications.","area":"United Kingdom (UK) - on or related to Midland Rail Hub, covering routes through Cardiff, Bristol, Gloucester, Derby, Birmingham, Leicester, and Lincoln.","bbox":{"south_latitude":51.35,"west_longitude":-3.27,"north_latitude":53.26,"east_longitude":-0.36},"id":{"authority":"EPSG","code":9870}}