metre
EPSG
1999-10-20
Used by India since metrication. Clarke's 1865 Indian foot-British foot ratio (0.99999566) and his 1865 British inch-metre ratio (39.369971) rounded as 1 Ind ft = 0.3047995m exactly applied to Everest's 1830 original definition taken as a and b.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Ellipsoid", "name": "Everest 1830 (1975 Definition)", "semi_major_axis": 6377299.151, "inverse_flattening": 300.8017255, "id": { "authority": "EPSG", "code": 7045 } }