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{
"geographicCRS": {
"EPSG:4277": {
"code": "EPSG:4277",
"name": "OSGB36",
"type": "geographic",
"datum": {
"name": "Ordnance Survey of Great Britain 1936",
"ellipsoid": "Airy 1830",
"type": "geodetic"
},
"areaOfUse": {
"description": "United Kingdom (UK) - Great Britain - England, Scotland, Wales - onshore",
"bbox": {
"north": 60.9,
"south": 49.8,
"east": 1.8,
"west": -8.7
},
"regions": ["England", "Scotland", "Wales"]
},
"accuracy": {
"horizontal": "~5m relative to ETRS89",
"note": "Historic datum with local distortions"
},
"remarks": "Traditional datum for Great Britain. Use ETRS89 for new high-accuracy work. OSTN15 transformation required for accurate conversion to ETRS89.",
"useCases": [
"Legacy mapping data",
"Ordnance Survey historic maps",
"British National Grid coordinates"
],
"deprecated": false
},
"EPSG:4258": {
"code": "EPSG:4258",
"name": "ETRS89",
"type": "geographic",
"datum": {
"name": "European Terrestrial Reference System 1989",
"ellipsoid": "GRS 1980",
"type": "geodetic"
},
"areaOfUse": {
"description": "Europe - onshore and offshore",
"bbox": {
"north": 84.73,
"south": 32.88,
"east": 40.18,
"west": -16.1
}
},
"accuracy": {
"horizontal": "1-2cm relative to ITRF",
"note": "European reference frame coincident with ITRF at epoch 1989.0"
},
"remarks": "Recommended datum for new surveys in the UK and Europe. Practically identical to WGS84 for most applications.",
"useCases": [
"Modern surveying",
"GNSS positioning",
"European data exchange",
"INSPIRE compliance"
],
"deprecated": false
}
},
"projectedCRS": {
"EPSG:27700": {
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid",
"type": "projected",
"baseCRS": "EPSG:4277",
"projection": {
"name": "Transverse Mercator",
"method": "Transverse Mercator",
"parameters": {
"latitudeOfOrigin": 49,
"centralMeridian": -2,
"scaleFactor": 0.9996012717,
"falseEasting": 400000,
"falseNorthing": -100000
}
},
"areaOfUse": {
"description": "United Kingdom (UK) - Great Britain - England, Scotland, Wales - onshore",
"bbox": {
"north": 60.9,
"south": 49.8,
"east": 1.8,
"west": -8.7
},
"regions": ["England", "Scotland", "Wales"]
},
"accuracy": {
"horizontal": "Survey-grade within Great Britain",
"note": "National grid for Great Britain"
},
"remarks": "The national projected CRS for Great Britain. Used by Ordnance Survey for all mapping. Grid references use 100km squares (e.g., TQ 123 456).",
"useCases": [
"Ordnance Survey mapping",
"Land surveying",
"Planning and development",
"Emergency services"
],
"deprecated": false
},
"EPSG:7405": {
"code": "EPSG:7405",
"name": "OSGB36 / British National Grid + ODN height",
"type": "compound",
"baseCRS": "EPSG:27700",
"areaOfUse": {
"description": "United Kingdom (UK) - Great Britain - England, Scotland, Wales - onshore",
"regions": ["England", "Scotland", "Wales"]
},
"remarks": "Compound CRS combining BNG horizontal with Ordnance Datum Newlyn (ODN) heights.",
"useCases": ["3D surveying", "Height referencing", "Engineering projects"],
"deprecated": false
},
"EPSG:29902": {
"code": "EPSG:29902",
"name": "TM65 / Irish Grid",
"type": "projected",
"baseCRS": "EPSG:4299",
"projection": {
"name": "Transverse Mercator",
"method": "Transverse Mercator",
"parameters": {
"latitudeOfOrigin": 53.5,
"centralMeridian": -8,
"scaleFactor": 1.000035,
"falseEasting": 200000,
"falseNorthing": 250000
}
},
"areaOfUse": {
"description": "Ireland - onshore",
"regions": ["Northern Ireland", "Republic of Ireland"]
},
"remarks": "Historic Irish Grid. Superseded by Irish Transverse Mercator (ITM) for new work.",
"useCases": ["Legacy Irish mapping", "Northern Ireland historic data"],
"deprecated": true
},
"EPSG:2157": {
"code": "EPSG:2157",
"name": "IRENET95 / Irish Transverse Mercator",
"type": "projected",
"baseCRS": "EPSG:4173",
"projection": {
"name": "Transverse Mercator",
"method": "Transverse Mercator",
"parameters": {
"latitudeOfOrigin": 53.5,
"centralMeridian": -8,
"scaleFactor": 0.99982,
"falseEasting": 600000,
"falseNorthing": 750000
}
},
"areaOfUse": {
"description": "Ireland - onshore",
"regions": ["Northern Ireland", "Republic of Ireland"]
},
"remarks": "Modern Irish projection based on ETRS89. Recommended for all new work in Ireland including Northern Ireland.",
"useCases": ["Modern Irish surveying", "Cross-border projects", "GNSS surveys"],
"deprecated": false
}
},
"zoneMapping": {
"England": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"Scotland": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"Wales": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"Northern Ireland": {
"zone": "ITM",
"code": "EPSG:2157",
"name": "IRENET95 / Irish Transverse Mercator",
"notes": "Irish Transverse Mercator"
},
"Greater London": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"South East": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"South West": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"East of England": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"East Midlands": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"West Midlands": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"Yorkshire and the Humber": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"North West": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"North East": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"Highlands": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" },
"Central Belt": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"Scottish Borders": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"North Wales": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"South Wales": {
"zone": "BNG",
"code": "EPSG:27700",
"name": "OSGB36 / British National Grid"
},
"Mid Wales": { "zone": "BNG", "code": "EPSG:27700", "name": "OSGB36 / British National Grid" }
}
}