{
	"rules": {
		"web_mapping": {
			"primary": "EPSG:3857",
			"alternatives": ["EPSG:4326"],
			"fallback": "EPSG:4258",
			"reasoning": "Web Mercator (EPSG:3857) is the standard for web mapping tiles. Use WGS84 (EPSG:4326) for GeoJSON data exchange.",
			"pros": [
				"Universal web map tile compatibility",
				"Consistent with Google Maps, OpenStreetMap, etc."
			],
			"cons": ["Significant area and distance distortion", "Not suitable for measurements"],
			"warnings": ["Do not use Web Mercator for area or distance calculations"]
		},
		"distance_calculation": {
			"primary": "EPSG:27700",
			"alternatives": ["UTM zones"],
			"fallback": "EPSG:4258",
			"reasoning": "British National Grid provides excellent accuracy for distance calculations within Great Britain. UTM zones are alternative for cross-border work.",
			"pros": [
				"Single projection for all of Great Britain",
				"Minimal distortion within coverage area",
				"Survey-grade accuracy"
			],
			"cons": ["Not valid for Northern Ireland (use ITM)", "Not suitable outside GB mainland"]
		},
		"area_calculation": {
			"primary": "EPSG:27700",
			"alternatives": ["EPSG:2157"],
			"fallback": "EPSG:4258",
			"reasoning": "British National Grid is suitable for area calculations in Great Britain. Use ITM for Northern Ireland.",
			"pros": [
				"Good area preservation within Great Britain",
				"Single projection for England, Scotland, Wales"
			],
			"cons": ["Increasing distortion at edges of coverage", "Not suitable for Northern Ireland"],
			"warnings": ["For Northern Ireland, use Irish Transverse Mercator (EPSG:2157)"]
		},
		"survey": {
			"primary": "EPSG:27700",
			"alternatives": ["EPSG:4258"],
			"fallback": "EPSG:4258",
			"reasoning": "British National Grid is the official survey system for Great Britain. Use OSTN15 transformation for highest accuracy.",
			"pros": [
				"Official UK survey standard",
				"Consistent with Ordnance Survey mapping",
				"Well-established infrastructure"
			],
			"cons": ["Based on historic OSGB36 datum", "Requires transformation for GNSS data"],
			"codePattern": "EPSG:27700",
			"usesZoneMapping": true
		},
		"navigation": {
			"primary": "EPSG:4326",
			"alternatives": ["EPSG:4258"],
			"fallback": "EPSG:4326",
			"reasoning": "WGS84 is the standard for GPS/GNSS navigation. ETRS89 is practically equivalent for UK navigation.",
			"pros": ["Universal GPS compatibility", "Direct use of GNSS coordinates"],
			"cons": ["Geographic coordinates require conversion for display"]
		},
		"data_exchange": {
			"primary": "EPSG:4258",
			"alternatives": ["EPSG:4326"],
			"fallback": "EPSG:4326",
			"reasoning": "ETRS89 is the European standard for data exchange. Required for INSPIRE compliance. WGS84 for international data.",
			"pros": ["INSPIRE compliant", "European interoperability", "Modern geodetic datum"],
			"cons": ["Requires transformation from legacy OSGB36 data"]
		},
		"data_storage": {
			"primary": "EPSG:4258",
			"alternatives": ["EPSG:27700", "EPSG:4326"],
			"fallback": "EPSG:4326",
			"reasoning": "ETRS89 recommended for new UK data. BNG for compatibility with OS data. WGS84 for international use.",
			"pros": ["Future-proof datum", "INSPIRE compliant"],
			"cons": ["May require transformation for legacy applications"]
		},
		"visualization": {
			"primary": "EPSG:27700",
			"alternatives": ["EPSG:3857"],
			"fallback": "EPSG:4326",
			"reasoning": "British National Grid provides familiar UK map appearance. Web Mercator for interactive web maps.",
			"pros": ["Familiar appearance for UK maps", "Consistent with Ordnance Survey products"],
			"cons": ["Not suitable for maps extending beyond UK"]
		}
	},
	"multiZoneRegions": {
		"Northern Ireland": {
			"note": "Northern Ireland uses Irish Transverse Mercator, not British National Grid",
			"subRegions": {},
			"cities": {
				"Belfast": "EPSG:2157",
				"Londonderry": "EPSG:2157"
			},
			"default": "EPSG:2157"
		}
	}
}