Engineering survey and topographic mapping for railway applications.
Created in 2020 to support intermediate CRS "TPEN11-IRF" in the emulation of the combined TPEN11 Snake and TPEN11ext Snake map projections.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeodeticReferenceFrame", "name": "TPEN11 Intermediate Reference Frame", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 }, "scope": "Engineering survey and topographic mapping for railway applications.", "area": "United Kingdom (UK) - on or related to the Trans-Pennine rail route from Liverpool via Manchester to Bradford and Leeds.", "bbox": { "south_latitude": 53.32, "west_longitude": -3.14, "north_latitude": 53.9, "east_longitude": -1.34 }, "id": { "authority": "EPSG", "code": 1266 } }