{
  "version": "2026-04-30-real-data-v1",
  "generatedAt": "2026-04-29T20:54:55.364Z",
  "prefecture": {
    "code": "12",
    "slug": "chiba",
    "name": "千葉県",
    "region": "関東",
    "center": {
      "lat": 35.60472,
      "lng": 140.12333,
      "zoom": 8
    }
  },
  "metrics": {
    "transactionPrice": {
      "median": 20000000,
      "average": 33918442,
      "count": 14639,
      "unit": "円",
      "period": "2024",
      "sourceId": "reinfolib-xit001",
      "missingReason": null
    },
    "landPrice": {
      "median": 96550,
      "average": 129885,
      "count": 1908,
      "unit": "円/m²",
      "period": "2026",
      "sourceId": "reinfolib-xct001",
      "missingReason": null
    },
    "population": {
      "latest": 6284480,
      "year": 2020,
      "changeRate5y": null,
      "unit": "人",
      "sourceId": "estat-population",
      "missingReason": "2020年国勢調査の都道府県別総人口を掲載。5年増減率は同一表内で算出できる過去年が未確認のため未掲載です。"
    },
    "hazardRisk": {
      "score": null,
      "level": "要地域確認",
      "summary": "千葉県の災害リスクは住所、地形、自治体ハザードマップで判定が変わります。Phase 1では国土数値情報の公式入口を確認し、重い災害GeoJSONの全面同梱は行っていません。",
      "sourceId": "ksj-hazard",
      "missingReason": "国土数値情報の災害データは住所単位の確認が必要なため、県別の単一スコアには集約していません。",
      "indicators": [
        {
          "label": "住所単位確認",
          "value": "自治体ハザードマップ必須",
          "sourceId": "ksj-hazard"
        },
        {
          "label": "Phase 1方針",
          "value": "巨大GeoJSON同梱なし",
          "sourceId": "ksj-hazard"
        }
      ]
    }
  },
  "landPrice": {
    "municipalityRanking": [
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "median": 381500,
        "average": 393175,
        "count": 40,
        "lat": 35.653513,
        "lng": 139.898862
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "median": 288000,
        "average": 306517,
        "count": 126,
        "lat": 35.719143,
        "lng": 139.926617
      },
      {
        "municipalityCode": "12106",
        "municipality": "千葉市美浜区",
        "median": 201500,
        "average": 196111,
        "count": 18,
        "lat": 35.634551,
        "lng": 140.067826
      },
      {
        "municipalityCode": "12220",
        "municipality": "流山市",
        "median": 190000,
        "average": 194196,
        "count": 50,
        "lat": 35.866727,
        "lng": 139.916512
      },
      {
        "municipalityCode": "12204",
        "municipality": "船橋市",
        "median": 181000,
        "average": 198441,
        "count": 164,
        "lat": 35.721467,
        "lng": 140.007343
      },
      {
        "municipalityCode": "12216",
        "municipality": "習志野市",
        "median": 180000,
        "average": 204283,
        "count": 46,
        "lat": 35.686314,
        "lng": 140.040539
      },
      {
        "municipalityCode": "12103",
        "municipality": "千葉市稲毛区",
        "median": 169000,
        "average": 186125,
        "count": 56,
        "lat": 35.643372,
        "lng": 140.106917
      },
      {
        "municipalityCode": "12207",
        "municipality": "松戸市",
        "median": 157000,
        "average": 169775,
        "count": 138,
        "lat": 35.800031,
        "lng": 139.929108
      },
      {
        "municipalityCode": "12101",
        "municipality": "千葉市中央区",
        "median": 143000,
        "average": 170063,
        "count": 78,
        "lat": 35.593354,
        "lng": 140.133219
      },
      {
        "municipalityCode": "12102",
        "municipality": "千葉市花見川区",
        "median": 127500,
        "average": 147867,
        "count": 66,
        "lat": 35.671805,
        "lng": 140.083298
      },
      {
        "municipalityCode": "12217",
        "municipality": "柏市",
        "median": 116000,
        "average": 141543,
        "count": 158,
        "lat": 35.852496,
        "lng": 139.971675
      },
      {
        "municipalityCode": "12221",
        "municipality": "八千代市",
        "median": 107250,
        "average": 113887,
        "count": 60,
        "lat": 35.719497,
        "lng": 140.102795
      },
      {
        "municipalityCode": "12224",
        "municipality": "鎌ケ谷市",
        "median": 100500,
        "average": 104271,
        "count": 34,
        "lat": 35.768964,
        "lng": 140.002883
      },
      {
        "municipalityCode": "12232",
        "municipality": "白井市",
        "median": 93700,
        "average": 78322,
        "count": 18,
        "lat": 35.789145,
        "lng": 140.043197
      },
      {
        "municipalityCode": "12222",
        "municipality": "我孫子市",
        "median": 93000,
        "average": 97458,
        "count": 62,
        "lat": 35.869193,
        "lng": 140.051212
      },
      {
        "municipalityCode": "12104",
        "municipality": "千葉市若葉区",
        "median": 91500,
        "average": 98600,
        "count": 50,
        "lat": 35.62943,
        "lng": 140.158414
      },
      {
        "municipalityCode": "12105",
        "municipality": "千葉市緑区",
        "median": 78900,
        "average": 85357,
        "count": 28,
        "lat": 35.543886,
        "lng": 140.211452
      },
      {
        "municipalityCode": "12228",
        "municipality": "四街道市",
        "median": 68400,
        "average": 70156,
        "count": 34,
        "lat": 35.667501,
        "lng": 140.171599
      },
      {
        "municipalityCode": "12208",
        "municipality": "野田市",
        "median": 65000,
        "average": 57424,
        "count": 58,
        "lat": 35.964438,
        "lng": 139.860478
      },
      {
        "municipalityCode": "12212",
        "municipality": "佐倉市",
        "median": 64250,
        "average": 66477,
        "count": 74,
        "lat": 35.715978,
        "lng": 140.187842
      }
    ],
    "points": [
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 1100000,
        "lat": 35.73118528,
        "lng": 139.90957333,
        "address": "市川１－２１－１０"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 1100000,
        "lat": 35.73118528,
        "lng": 139.90957333,
        "address": "市川１－２１－１０"
      },
      {
        "municipalityCode": "12216",
        "municipality": "習志野市",
        "pricePerSquareMeter": 550000,
        "lat": 35.68697111,
        "lng": 140.01537111,
        "address": "奏の杜３－６－１"
      },
      {
        "municipalityCode": "12216",
        "municipality": "習志野市",
        "pricePerSquareMeter": 546000,
        "lat": 35.68697111,
        "lng": 140.01537111,
        "address": "奏の杜３－６－１"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 490000,
        "lat": 35.72814306,
        "lng": 139.924195,
        "address": "菅野２－３－１５"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 490000,
        "lat": 35.72814306,
        "lng": 139.924195,
        "address": "菅野２－３－１５"
      },
      {
        "municipalityCode": "12204",
        "municipality": "船橋市",
        "pricePerSquareMeter": 485000,
        "lat": 35.70484028,
        "lng": 139.98324472,
        "address": "本町７－１５－３"
      },
      {
        "municipalityCode": "12204",
        "municipality": "船橋市",
        "pricePerSquareMeter": 485000,
        "lat": 35.70484028,
        "lng": 139.98324472,
        "address": "本町７－１５－３"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 485000,
        "lat": 35.66736806,
        "lng": 139.89970833,
        "address": "北栄３－３６－９"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 485000,
        "lat": 35.66736806,
        "lng": 139.89970833,
        "address": "北栄３－３６－９"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 483000,
        "lat": 35.66427778,
        "lng": 139.90080556,
        "address": "北栄３－８－８"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 483000,
        "lat": 35.66427778,
        "lng": 139.90080556,
        "address": "北栄３－８－８"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 472000,
        "lat": 35.69050444,
        "lng": 139.93196889,
        "address": "妙典５－１６－６"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 470000,
        "lat": 35.69050444,
        "lng": 139.93196889,
        "address": "妙典５－１６－６"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 467000,
        "lat": 35.636,
        "lng": 139.89011111,
        "address": "舞浜３－２７－９"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 467000,
        "lat": 35.636,
        "lng": 139.89011111,
        "address": "舞浜３－２７－９"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 460000,
        "lat": 35.72652778,
        "lng": 139.91305556,
        "address": "新田２－２８－１４"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 460000,
        "lat": 35.72652778,
        "lng": 139.91305556,
        "address": "新田２－２８－１４"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 452000,
        "lat": 35.71833944,
        "lng": 139.93065111,
        "address": "南八幡１－８－１８"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 450000,
        "lat": 35.72436333,
        "lng": 139.9324425,
        "address": "八幡４－１２－９"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 450000,
        "lat": 35.72436333,
        "lng": 139.9324425,
        "address": "八幡４－１２－９"
      },
      {
        "municipalityCode": "12204",
        "municipality": "船橋市",
        "pricePerSquareMeter": 450000,
        "lat": 35.6984,
        "lng": 139.98946667,
        "address": "本町４－２８－１６"
      },
      {
        "municipalityCode": "12204",
        "municipality": "船橋市",
        "pricePerSquareMeter": 450000,
        "lat": 35.6984,
        "lng": 139.98946667,
        "address": "本町４－２８－１６"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 446000,
        "lat": 35.71833944,
        "lng": 139.93065111,
        "address": "南八幡１－８－１８"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 445000,
        "lat": 35.72786111,
        "lng": 139.90125,
        "address": "市川南４－１０－２"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 441000,
        "lat": 35.67641833,
        "lng": 139.90091083,
        "address": "相之川３－３－１４"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 440000,
        "lat": 35.72464139,
        "lng": 139.92060444,
        "address": "平田１－１７－６"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 440000,
        "lat": 35.72464139,
        "lng": 139.92060444,
        "address": "平田１－１７－６"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 440000,
        "lat": 35.72786111,
        "lng": 139.90125,
        "address": "市川南４－１０－２"
      },
      {
        "municipalityCode": "12217",
        "municipality": "柏市",
        "pricePerSquareMeter": 440000,
        "lat": 35.89084,
        "lng": 139.95339694,
        "address": "若柴字原山２７７番７"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 439000,
        "lat": 35.67716667,
        "lng": 139.91563889,
        "address": "行徳駅前４－１６－７"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 437000,
        "lat": 35.67641833,
        "lng": 139.90091083,
        "address": "相之川３－３－１４"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 437000,
        "lat": 35.67716667,
        "lng": 139.91563889,
        "address": "行徳駅前４－１６－７"
      },
      {
        "municipalityCode": "12217",
        "municipality": "柏市",
        "pricePerSquareMeter": 437000,
        "lat": 35.89084,
        "lng": 139.95339694,
        "address": "若柴字原山２７７番７"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 436000,
        "lat": 35.67017917,
        "lng": 139.90682139,
        "address": "南行徳２－７－３"
      },
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "pricePerSquareMeter": 436000,
        "lat": 35.667,
        "lng": 139.890595,
        "address": "当代島１－１２－１９"
      },
      {
        "municipalityCode": "12101",
        "municipality": "千葉市中央区",
        "pricePerSquareMeter": 435000,
        "lat": 35.60529306,
        "lng": 140.11768111,
        "address": "新宿２－７－１２"
      },
      {
        "municipalityCode": "12101",
        "municipality": "千葉市中央区",
        "pricePerSquareMeter": 435000,
        "lat": 35.60529306,
        "lng": 140.11768111,
        "address": "新宿２－７－１２"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 435000,
        "lat": 35.73047222,
        "lng": 139.91472222,
        "address": "菅野３－２０－５"
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "pricePerSquareMeter": 435000,
        "lat": 35.73510639,
        "lng": 139.91087722,
        "address": "真間２－２－２"
      }
    ],
    "percentiles": {
      "p25": 49000,
      "p50": 96550,
      "p75": 175000
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  },
  "transactions": {
    "histogram": [
      {
        "label": "0-1000万円",
        "min": 0,
        "max": 10000000,
        "count": 4643
      },
      {
        "label": "1000万-2000万円",
        "min": 10000000,
        "max": 20000000,
        "count": 2433
      },
      {
        "label": "2000万-3000万円",
        "min": 20000000,
        "max": 30000000,
        "count": 2235
      },
      {
        "label": "3000万-5000万円",
        "min": 30000000,
        "max": 50000000,
        "count": 3278
      },
      {
        "label": "5000万-1億円",
        "min": 50000000,
        "max": 100000000,
        "count": 1507
      },
      {
        "label": "1億円以上",
        "min": 100000000,
        "max": null,
        "count": 543
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    ],
    "municipalitySummary": [
      {
        "municipalityCode": "12227",
        "municipality": "浦安市",
        "median": 56000000,
        "average": 68687259,
        "count": 259,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12203",
        "municipality": "市川市",
        "median": 40000000,
        "average": 63459081,
        "count": 936,
        "lat": null,
        "lng": null
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      {
        "municipalityCode": "12220",
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        "average": 49148789,
        "count": 407,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12216",
        "municipality": "習志野市",
        "median": 35000000,
        "average": 42815775,
        "count": 374,
        "lat": null,
        "lng": null
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      {
        "municipalityCode": "12207",
        "municipality": "松戸市",
        "median": 31000000,
        "average": 40269407,
        "count": 1011,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12101",
        "municipality": "千葉市中央区",
        "median": 30000000,
        "average": 48826571,
        "count": 525,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12204",
        "municipality": "船橋市",
        "median": 30000000,
        "average": 58056245,
        "count": 1369,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12103",
        "municipality": "千葉市稲毛区",
        "median": 29000000,
        "average": 36889971,
        "count": 349,
        "lat": null,
        "lng": null
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      {
        "municipalityCode": "12217",
        "municipality": "柏市",
        "median": 29000000,
        "average": 45398128,
        "count": 934,
        "lat": null,
        "lng": null
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      {
        "municipalityCode": "12102",
        "municipality": "千葉市花見川区",
        "median": 28000000,
        "average": 43537642,
        "count": 352,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12221",
        "municipality": "八千代市",
        "median": 28000000,
        "average": 41419592,
        "count": 444,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12106",
        "municipality": "千葉市美浜区",
        "median": 26000000,
        "average": 38915663,
        "count": 249,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12231",
        "municipality": "印西市",
        "median": 26000000,
        "average": 40369704,
        "count": 257,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12105",
        "municipality": "千葉市緑区",
        "median": 24000000,
        "average": 28681411,
        "count": 241,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12224",
        "municipality": "鎌ケ谷市",
        "median": 23000000,
        "average": 31129388,
        "count": 245,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12222",
        "municipality": "我孫子市",
        "median": 22000000,
        "average": 25785111,
        "count": 315,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12104",
        "municipality": "千葉市若葉区",
        "median": 20000000,
        "average": 31650323,
        "count": 313,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12228",
        "municipality": "四街道市",
        "median": 19000000,
        "average": 28039890,
        "count": 191,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12212",
        "municipality": "佐倉市",
        "median": 17000000,
        "average": 21961754,
        "count": 398,
        "lat": null,
        "lng": null
      },
      {
        "municipalityCode": "12206",
        "municipality": "木更津市",
        "median": 16000000,
        "average": 27562545,
        "count": 347,
        "lat": null,
        "lng": null
      }
    ],
    "sampleCount": 14639,
    "percentiles": {
      "p25": 6300000,
      "p50": 20000000,
      "p75": 38000000
    }
  },
  "populationTrend": [
    {
      "year": 2020,
      "value": 6284480,
      "sourceId": "estat-population"
    }
  ],
  "hazardRisk": {
    "score": null,
    "level": "要地域確認",
    "summary": "千葉県の災害リスクは住所、地形、自治体ハザードマップで判定が変わります。Phase 1では国土数値情報の公式入口を確認し、重い災害GeoJSONの全面同梱は行っていません。",
    "sourceId": "ksj-hazard",
    "missingReason": "国土数値情報の災害データは住所単位の確認が必要なため、県別の単一スコアには集約していません。",
    "indicators": [
      {
        "label": "住所単位確認",
        "value": "自治体ハザードマップ必須",
        "sourceId": "ksj-hazard"
      },
      {
        "label": "Phase 1方針",
        "value": "巨大GeoJSON同梱なし",
        "sourceId": "ksj-hazard"
      }
    ]
  },
  "sources": [
    {
      "id": "reinfolib-xit001",
      "name": "不動産情報ライブラリ XIT001",
      "url": "https://www.reinfolib.mlit.go.jp/help/apiManual/xit001/",
      "retrievedAt": "2026-04-29T20:54:55.364Z",
      "period": "2024",
      "notes": "不動産取引価格情報を都道府県別・四半期別に取得し、取引価格を集計しています。"
    },
    {
      "id": "reinfolib-xct001",
      "name": "不動産情報ライブラリ XCT001",
      "url": "https://www.reinfolib.mlit.go.jp/help/apiManual/xct001/",
      "retrievedAt": "2026-04-29T20:54:55.364Z",
      "period": "2026",
      "notes": "地価公示の住宅地データを取得し、1㎡当たり価格を集計しています。"
    },
    {
      "id": "estat-population",
      "name": "e-Stat 国勢調査 人口",
      "url": "https://www.e-stat.go.jp/api/api-info/e-stat-manual3-0",
      "retrievedAt": "2026-04-29T20:54:55.364Z",
      "period": "2020",
      "notes": "getStatsList/getMetaInfoで統計表と次元を確認し、getStatsDataで都道府県別総人口を取得しています。"
    },
    {
      "id": "ksj-hazard",
      "name": "国土数値情報",
      "url": "https://nlftp.mlit.go.jp/ksj/",
      "retrievedAt": "2026-04-29T20:54:55.364Z",
      "period": "dataset-specific",
      "notes": "Phase 1では巨大GeoJSONを同梱せず、公式災害・地理空間データの確認導線と地域確認注意を掲載しています。"
    },
    {
      "id": "gsi-tiles",
      "name": "国土地理院 地理院タイル",
      "url": "https://maps.gsi.go.jp/development/",
      "retrievedAt": "2026-04-29T20:54:55.364Z",
      "period": "current",
      "notes": "MapLibre GL JSの背景地図として標準地図タイルを利用します。"
    }
  ],
  "quality": {
    "missingReasons": [
      "2020年国勢調査の都道府県別総人口を掲載。5年増減率は同一表内で算出できる過去年が未確認のため未掲載です。",
      "国土数値情報の災害データは住所単位の確認が必要なため、県別の単一スコアには集約していません。"
    ],
    "warnings": [
      "取引価格は2024年の不動産取引価格情報を集計しており、個別物件の査定額ではありません。",
      "地価公示は住宅地division=00の1㎡当たり価格を集計しています。",
      "災害リスクは住所単位で変わるため、自治体ハザードマップで必ず確認してください。"
    ]
  },
  "ranking": {
    "landPriceRank": 9,
    "transactionRank": 7,
    "populationRank": 6
  }
}