{
  "floor_id": "B2",
  "image_file": "floor_rectified.png",
  "meters_per_pixel": 0.21126528,
  "scale": {
    "meters_per_pixel": 0.21126528
  },
  "rotation_deg": 31.5,
  "calibration_mode": "mpp_primary",
  "calibration_mode_note": "模式A：meters_per_pixel 由两点真实距离定标，是导航主参数；Image Width/Height 与 Effective Width/Height 为只读，其中 venue.width_m/height_m 自动由 image_size*mpp 写入。",
  "venue": {
    "width_m": 263.7,
    "height_m": 351.5
  },
  "image_size": {
    "width_px": 1248,
    "height_px": 1664
  },
  "operation_log": [
    "逆时针旋转90°",
    "逆时针旋转90°",
    "逆时针旋转90°",
    "逆时针旋转90°",
    "顺时针旋转90°"
  ],
  "geo_reference": {
    "anchor_px": {
      "x": 590.3,
      "y": 720.6
    },
    "anchor_wgs84": {
      "lat": 40.0958,
      "lon": 116.28639
    },
    "xy_reference_note": "anchor_wgs84 必须对应 anchor_px 的同一真实位置；局部米制坐标采用图片坐标系：x_m=(x_px-anchor_px.x)*meters_per_pixel，y_m=(y_px-anchor_px.y)*meters_per_pixel；x_m 向右为正，y_m 向下为正。"
  }
}