{
  "drawing": "TSC Masterplan Final.dwg",
  "image": "THe Sustainable City Dubai.jpg",
  "drawing_units": "metres",
  "method": "Single affine least-squares fit using visually identified ground features. Points digitised from two different design revisions; these are local alignment checks, not survey control.",
  "source_jpg_width": 14000,
  "source_jpg_height": 7875,
  "cad_xy_m_to_source_jpg_px": [
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  ],
  "controls": [
    {
      "name": "Entry roundabout centre",
      "cad_xy_m": [
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        2769102.89
      ],
      "jpg_xy_px": [
        1509.2,
        1373.4
      ],
      "error_m": 0.74
    },
    {
      "name": "First upper parking median, spine end",
      "cad_xy_m": [
        494405.698,
        2769316.682
      ],
      "jpg_xy_px": [
        7079.1,
        3479.0
      ],
      "error_m": 1.2
    },
    {
      "name": "Second upper parking median, spine end",
      "cad_xy_m": [
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        2769488.613
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      "jpg_xy_px": [
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        3451.7
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      "error_m": 0.85
    },
    {
      "name": "Open plot, east boundary at southern path",
      "cad_xy_m": [
        494462.512,
        2769056.066
      ],
      "jpg_xy_px": [
        5215.7,
        6211.1
      ],
      "error_m": 0.93
    },
    {
      "name": "Lower central parking, middle divider at southern path",
      "cad_xy_m": [
        494763.823,
        2769323.271
      ],
      "jpg_xy_px": [
        10180.1,
        6658.4
      ],
      "error_m": 1.22
    }
  ],
  "held_out": [
    {
      "name": "Upper east parking aisle, south edge of first crossing",
      "cad_xy_m": [
        494449.131,
        2769584.023
      ],
      "jpg_xy_px": [
        9843.4,
        1569.4
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      "error_m": 3.33
    },
    {
      "name": "Open plot, west boundary at southern path",
      "cad_xy_m": [
        494427.894,
        2769017.693
      ],
      "jpg_xy_px": [
        4579.4,
        6227.9
      ],
      "error_m": 1.54
    },
    {
      "name": "Lower east entrance to villa path",
      "cad_xy_m": [
        494912.108,
        2769482.169
      ],
      "jpg_xy_px": [
        12824.7,
        6658.4
      ],
      "error_m": 5.07
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  ],
  "held_out_rmse_m": 3.61,
  "limitations": [
    "Photo-derived building and canopy heights are illustrative.",
    "Green spine dome and court updates follow the JPG.",
    "Older linework is displayed for comparison only. No GNSS datum or survey control has been verified."
  ],
  "source_sha256": {
    "TSC Masterplan Final.dwg": "641abeb324043ab1bb11a218abf3dd9cb54b016a17e98cf64b035fc9bdecb762",
    "THe Sustainable City Dubai.jpg": "25813998533e01d1530317dbd37b3c05b179b27aebeaf0f4d770d49a4ac31207"
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  "camera_reference": "Uruk candidate-nov-streets.blend, Aerial camera"
}