{
  "schema_version": "0.1.0",
  "project_id": "centennial-jingzhang-ai-belt",
  "package_id": "jingzhang-ai-civic-loop",
  "calculation_method": {
    "projection": "EPSG:4326 (spherical approximation for area)",
    "reference_projection": "EPSG:4548 (CGCS2000 / 3-degree Gauss-Kruger zone 39)",
    "note": "Areas calculated using spherical excess approximation; slight deviation from projected planimetric area."
  },
  "site_metrics": {
    "site_area_sqm": 11399912.9,
    "site_area_declared_sqm": 11400000,
    "green_ratio": 0.2151,
    "public_space_ratio": 0.1225,
    "key_area_count": 3,
    "road_total_length_m": 55361.6,
    "building_total_footprint_sqm": 1032680.3,
    "estimated_gfa_sqm": 10994261.6,
    "estimated_far": 0.96,
    "building_count": 15
  },
  "land_use_breakdown": {
    "B2": {
      "area_sqm": 936476.2,
      "ratio": 0.0821,
      "count": 2,
      "name_zh": "商务用地·大钟寺商贸区"
    },
    "B9": {
      "area_sqm": 1627957.9,
      "ratio": 0.1428,
      "count": 2,
      "name_zh": "混合用地·大钟寺东"
    },
    "S": {
      "area_sqm": 739234.6,
      "ratio": 0.0648,
      "count": 3,
      "name_zh": "道路与交通设施·南段"
    },
    "R2": {
      "area_sqm": 1756118.7,
      "ratio": 0.154,
      "count": 2,
      "name_zh": "二类居住用地·知春路社区"
    },
    "A3": {
      "area_sqm": 1478328.6,
      "ratio": 0.1297,
      "count": 2,
      "name_zh": "教育科研用地·北邮北航"
    },
    "G1": {
      "area_sqm": 2068752.7,
      "ratio": 0.1815,
      "count": 3,
      "name_zh": "公园绿地·京张铁路遗址公园南段"
    },
    "M1": {
      "area_sqm": 2678989.2,
      "ratio": 0.235,
      "count": 3,
      "name_zh": "研发用地·AI原点社区"
    },
    "U": {
      "area_sqm": 727441.1,
      "ratio": 0.0638,
      "count": 1,
      "name_zh": "公用设施用地·五道口北"
    }
  },
  "key_areas": [
    {
      "id": "PROV-KEY-001",
      "name_zh": "众智园AI自主创新加速区粗略范围",
      "announced_area_sqm": 1921000,
      "calculated_area_sqm": 1929201.877
    },
    {
      "id": "PROV-KEY-002",
      "name_zh": "北京AI原点社区粗略范围",
      "announced_area_sqm": 1043000,
      "calculated_area_sqm": 1043236.909
    },
    {
      "id": "PROV-KEY-003",
      "name_zh": "大钟寺AI产业聚集区粗略范围",
      "announced_area_sqm": 720000,
      "calculated_area_sqm": 720454.221
    }
  ],
  "green_space": {
    "total_area_sqm": 2452043.7,
    "count": 8,
    "green_ratio": 0.2151
  },
  "public_space": {
    "total_area_sqm": 1395923.8,
    "count": 8,
    "public_space_ratio": 0.1225
  },
  "phasing": {
    "near_term": {
      "name_zh": "近期建设区·大钟寺至知春路",
      "area_sqm": 3597950.2,
      "timeframe": "2026-2028"
    },
    "mid_term": {
      "name_zh": "中期建设区·AI原点社区",
      "area_sqm": 4057741.4,
      "timeframe": "2028-2031"
    },
    "far_term": {
      "name_zh": "远期建设区·众智园",
      "area_sqm": 3379415.8,
      "timeframe": "2031-2036"
    }
  },
  "roads": {
    "total_length_m": 55361.6,
    "count": 12,
    "existing_count": 10,
    "proposed_count": 2
  }
}