{
	"version": "2.0.0",
	"rules": {
		"web_mapping": {
			"description": "Optimal CRS for web map display",
			"global": {
				"primary": "EPSG:3857",
				"alternatives": ["EPSG:4326"],
				"reasoning": "Web Mercator is the standard for major map tile services (Google Maps, OpenStreetMap, etc.). Directly supported by libraries like Leaflet, Mapbox, and OpenLayers.",
				"pros": ["Wide support", "Fast rendering", "Tile compatible"],
				"cons": ["Large area distortion", "Cannot use in polar regions"],
				"warnings": [
					"Not suitable for area/distance calculations",
					"Significant distortion at high latitudes",
					"Cannot display latitudes beyond 85.06°"
				]
			},
			"japan": {
				"primary": "EPSG:3857",
				"alternatives": ["EPSG:6668"],
				"reasoning": "Web Mercator is the de facto standard for web maps in Japan as well. EPSG:6668 (JGD2011) is recommended for data storage.",
				"pros": ["Major library support", "Tile service compatible"],
				"cons": ["Noticeable distortion in Hokkaido", "Cannot calculate area"]
			}
		},
		"distance_calculation": {
			"description": "Accurate distance calculation",
			"global": {
				"primary": "Appropriate UTM zone",
				"alternatives": ["Geodetic calculation (on ellipsoid)"],
				"reasoning": "UTM uses Transverse Mercator projection with distance distortion under 0.04% within a zone. Geodetic calculation recommended for wide areas.",
				"pros": ["High accuracy", "Worldwide system"],
				"cons": ["Cannot calculate across zones"],
				"warnings": ["Distance calculations using Web Mercator (EPSG:3857) are inaccurate"]
			},
			"japan": {
				"primary": "Appropriate Japan Plane Rectangular CS",
				"codePattern": "EPSG:6669-6687",
				"alternatives": ["EPSG:32652-32654 (UTM)", "EPSG:6668"],
				"fallback": "EPSG:6668",
				"reasoning": "Japan's survey standard. Used in public surveys. Distortion under 1mm within coverage area.",
				"pros": ["High accuracy", "Legal basis", "Public survey compliant"],
				"cons": ["Zone selection required", "Multiple zones for wide areas"],
				"requirements": [
					"Select zone based on work area",
					"Use JGD2011 geographic CRS for cross-zone calculations"
				],
				"note": "Ellipsoidal calculations (Haversine/Vincenty) required when using geographic CRS"
			}
		},
		"area_calculation": {
			"description": "Accurate area calculation",
			"global": {
				"primary": "Equal-area projection (Lambert equal-area, etc.)",
				"examples": ["EPSG:6933"],
				"reasoning": "Equal-area projections are optimal for area calculations. Mercator projections cause significant distortion.",
				"pros": ["Area preserved", "Suitable for statistical analysis"],
				"cons": ["Shape distortion exists"],
				"warnings": [
					"Web Mercator (EPSG:3857) severely distorts area (several times larger at high latitudes compared to equator)"
				]
			},
			"japan": {
				"primary": "Appropriate Japan Plane Rectangular CS",
				"codePattern": "EPSG:6669-6687",
				"reasoning": "Japan Plane Rectangular CS is optimal for area calculations within Japan. Error limited to a few cm² per km².",
				"pros": ["High accuracy", "Standard within Japan"],
				"cons": ["Cannot span zones"],
				"warning": "Web Mercator (3857) is unsuitable for area calculation"
			}
		},
		"survey": {
			"description": "Survey work",
			"global": {
				"primary": "UTM",
				"reasoning": "UTM zones cover the entire world and provide accuracy suitable for surveying.",
				"pros": ["Global standard", "High accuracy"],
				"cons": ["Adjustment needed at zone boundaries"]
			},
			"japan": {
				"primary": "Appropriate Japan Plane Rectangular CS",
				"codePattern": "EPSG:6669-6687",
				"zoneSelection": "prefecture_based",
				"reasoning": "Compliant with Public Survey Procedures. Coordinate system established by Survey Act. Japan Plane Rectangular CS is the official survey coordinate system of GSI.",
				"pros": ["High accuracy", "Legal basis", "Public survey compliant"],
				"cons": ["Zone selection required", "Multiple zones for wide areas"],
				"requirements": [
					"Select zone based on work area",
					"Use JGD2011 (JGD2000 is deprecated)",
					"Legacy Japanese datum data requires transformation"
				]
			}
		},
		"navigation": {
			"description": "Navigation & GPS",
			"global": {
				"primary": "EPSG:4326",
				"reasoning": "GPS uses the WGS84 coordinate system. Car navigation and smartphone location data are acquired in this system.",
				"pros": ["GPS standard", "Worldwide coverage"],
				"cons": ["No projection (conversion needed for map display)"]
			},
			"japan": {
				"primary": "EPSG:6668",
				"alternatives": ["EPSG:4326"],
				"reasoning": "JGD2011 is practically identical to WGS84. Using JGD2011 within Japan ensures consistency with GSI data.",
				"pros": ["GSI data compatible", "Essentially equivalent to WGS84"],
				"cons": ["Caution needed when mixing with overseas data"],
				"note": "JGD2011 is practically identical to WGS84"
			}
		},
		"data_storage": {
			"description": "Long-term data storage",
			"global": {
				"primary": "EPSG:4326",
				"reasoning": "Store in geographic CRS, transform to projection as needed. Most widely recognized CRS. WGS84 has the widest compatibility and is suitable for long-term storage.",
				"pros": ["Highest compatibility", "Future-proof"],
				"cons": ["Projection transformation needed before calculations"]
			},
			"japan": {
				"primary": "EPSG:6668",
				"alternatives": ["EPSG:4326"],
				"reasoning": "JGD2011 is recommended for storing data within Japan. Always record CRS information in metadata. JGD2011 is Japan's geodetic standard. Conversion with 4326 is essentially equivalent.",
				"pros": ["Domestic standard", "GSI compatible"],
				"cons": ["May need conversion for international data exchange"]
			}
		},
		"data_exchange": {
			"description": "Data exchange & interoperability",
			"global": {
				"primary": "EPSG:4326",
				"reasoning": "Standard coordinate system for GeoJSON. Most widely used for international data exchange. International data exchange standard.",
				"pros": ["GeoJSON standard", "Widest compatibility"],
				"cons": ["Projected coordinate data needs conversion"]
			},
			"japan": {
				"primary": "EPSG:6668",
				"alternatives": ["EPSG:4326"],
				"reasoning": "Use JGD2011 between domestic agencies, WGS84 for international exchange. The difference between them is negligible in practice. JGD2011 for domestic, 4326 for international.",
				"pros": ["Domestic standard", "Nearly equivalent to 4326"],
				"cons": ["Strictly different from 4326"]
			}
		},
		"visualization": {
			"description": "Data visualization & cartography",
			"global": {
				"primary": "EPSG:3857",
				"alternatives": ["EPSG:4326"],
				"reasoning": "Optimal projection varies by display purpose. Various projections for global display, UTM or regional projections for local display. 3857 for web, consider 4326-based projection for printed maps.",
				"pros": ["Web standard", "Zoom support"],
				"cons": ["Distortion at high latitudes"]
			},
			"japan": {
				"primary": "EPSG:3857",
				"alternatives": ["EPSG:6669-6687"],
				"reasoning": "Use EPSG:3857 for interactive web maps, Japan Plane Rectangular CS for precise printed maps.",
				"pros": ["Web compatible", "Good usability"],
				"cons": ["Noticeable distortion in Hokkaido"]
			}
		}
	},
	"multiZonePrefectures": {
		"北海道": {
			"note": "Spans 3 zones (West=XI, Central=XII, East=XIII)",
			"subRegions": {
				"石狩": "EPSG:6680",
				"空知": "EPSG:6680",
				"後志": "EPSG:6679",
				"胆振": "EPSG:6679",
				"日高": "EPSG:6679",
				"渡島": "EPSG:6679",
				"檜山": "EPSG:6679",
				"上川": "EPSG:6680",
				"留萌": "EPSG:6680",
				"宗谷": "EPSG:6680",
				"オホーツク": "EPSG:6680",
				"十勝": "EPSG:6681",
				"釧路": "EPSG:6681",
				"根室": "EPSG:6681"
			},
			"cities": {
				"札幌市": "EPSG:6680",
				"旭川市": "EPSG:6680",
				"釧路市": "EPSG:6681",
				"函館市": "EPSG:6679",
				"帯広市": "EPSG:6681",
				"小樽市": "EPSG:6679",
				"北見市": "EPSG:6681",
				"江別市": "EPSG:6680",
				"苫小牧市": "EPSG:6680",
				"網走市": "EPSG:6681",
				"稚内市": "EPSG:6680",
				"根室市": "EPSG:6681"
			},
			"default": "EPSG:6679"
		},
		"沖縄県": {
			"note": "Spans 3 zones (Main Island=XV, Sakishima=XVI, Daito=XVII)",
			"subRegions": {
				"本島": "EPSG:6683",
				"先島": "EPSG:6684",
				"大東": "EPSG:6685",
				"宮古": "EPSG:6684",
				"八重山": "EPSG:6684"
			},
			"cities": {
				"那覇市": "EPSG:6683",
				"宜野湾市": "EPSG:6683",
				"浦添市": "EPSG:6683",
				"沖縄市": "EPSG:6683",
				"うるま市": "EPSG:6683",
				"名護市": "EPSG:6683",
				"糸満市": "EPSG:6683",
				"豊見城市": "EPSG:6683",
				"宮古島市": "EPSG:6684",
				"石垣市": "EPSG:6684",
				"南城市": "EPSG:6683"
			},
			"default": "EPSG:6683"
		}
	},
	"validationRules": {
		"deprecatedCrs": [
			"EPSG:4612",
			"EPSG:4301",
			"EPSG:2443",
			"EPSG:2444",
			"EPSG:2445",
			"EPSG:2446",
			"EPSG:2447",
			"EPSG:2448",
			"EPSG:2449",
			"EPSG:2450",
			"EPSG:2451",
			"EPSG:2452",
			"EPSG:2453",
			"EPSG:2454",
			"EPSG:2455",
			"EPSG:2456",
			"EPSG:2457",
			"EPSG:2458",
			"EPSG:2459",
			"EPSG:2460",
			"EPSG:2461"
		],
		"legacyDatumPatterns": ["EPSG:26", "EPSG:4301"],
		"webMappingCrs": ["EPSG:3857", "EPSG:4326"],
		"navigationCrs": ["EPSG:4326", "EPSG:6668"],
		"dataExchangeCrs": ["EPSG:4326", "EPSG:6668"],
		"planeRectangularRange": {
			"start": 6669,
			"end": 6687
		},
		"scoreWeights": {
			"deprecated": -50,
			"areaMismatch": -40,
			"legacyDatum": -50,
			"areaDistortion": -75,
			"distanceDistortion": -20,
			"zoneMismatch": -15,
			"crossZone": -10,
			"geojsonIncompatible": -15,
			"notOfficialSurvey": -10,
			"geographicCalc": -5,
			"betterAlternative": -5,
			"gpsConversionNeeded": -5,
			"projectedStorage": -5,
			"nonStandardExchange": -5,
			"nonStandardWeb": -5
		}
	}
}