{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"CompoundCRS","name":"SYC20 Grid + ODN height","components":[{"type":"ProjectedCRS","name":"SYC20 Grid","base_crs":{"type":"GeographicCRS","name":"SYC20-IRF","datum":{"type":"GeodeticReferenceFrame","name":"SYC20 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":10237},"remarks":"Intermediate CRS created in 2022 to assist the emulation of the ETRS89 / SYC20 SnakeGrid projected CRS through transformation ETRS89 to SYC20-IRF (1) (code 10238) used in conjunction with the SYC20-TM map projection (code 10239)."},"conversion":{"name":"SYC20-TM","method":{"name":"Transverse Mercator","id":{"authority":"EPSG","code":9807}},"parameters":[{"name":"Latitude of natural origin","value":52.9,"unit":"degree","id":{"authority":"EPSG","code":8801}},{"name":"Longitude of natural origin","value":-2.6,"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":110094.4312,"unit":"metre","id":{"authority":"EPSG","code":8806}},{"name":"False northing","value":120623.8396,"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 the rail route from Shrewsbury to Crewe.","bbox":{"south_latitude":52.65,"west_longitude":-2.91,"north_latitude":53.16,"east_longitude":-2.3},"id":{"authority":"EPSG","code":10241}}