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  "low_spots": [
    {
      "area_m2": 4.77,
      "at": [
        66.31,
        -27.83
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      "max_depth_mm": 203.0,
      "volume_l": 366.7
    },
    {
      "area_m2": 9.38,
      "at": [
        98.67,
        -73.09
      ],
      "max_depth_mm": 56.3,
      "volume_l": 188.7
    },
    {
      "area_m2": 10.59,
      "at": [
        61.15,
        -40.3
      ],
      "max_depth_mm": 50.1,
      "volume_l": 186.2
    },
    {
      "area_m2": 5.81,
      "at": [
        58.19,
        -10.31
      ],
      "max_depth_mm": 60.3,
      "volume_l": 137.8
    },
    {
      "area_m2": 4.17,
      "at": [
        74.18,
        -5.6
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      "max_depth_mm": 72.5,
      "volume_l": 98.6
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    {
      "area_m2": 1.68,
      "at": [
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        -22.09
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      "max_depth_mm": 106.4,
      "volume_l": 82.6
    },
    {
      "area_m2": 3.42,
      "at": [
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        -42.53
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      "max_depth_mm": 63.8,
      "volume_l": 82.5
    },
    {
      "area_m2": 5.56,
      "at": [
        67.02,
        34.47
      ],
      "max_depth_mm": 28.1,
      "volume_l": 73.5
    },
    {
      "area_m2": 3.54,
      "at": [
        9.2,
        12.76
      ],
      "max_depth_mm": 59.7,
      "volume_l": 66.5
    },
    {
      "area_m2": 0.96,
      "at": [
        53.79,
        -16.51
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      "max_depth_mm": 159.1,
      "volume_l": 55.2
    },
    {
      "area_m2": 2.12,
      "at": [
        85.95,
        -9.15
      ],
      "max_depth_mm": 38.5,
      "volume_l": 38.2
    },
    {
      "area_m2": 1.75,
      "at": [
        2.73,
        2.23
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      "max_depth_mm": 66.8,
      "volume_l": 19.1
    },
    {
      "area_m2": 0.87,
      "at": [
        82.26,
        -52.81
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      "max_depth_mm": 40.7,
      "volume_l": 17.9
    },
    {
      "area_m2": 1.07,
      "at": [
        60.32,
        -5.52
      ],
      "max_depth_mm": 29.8,
      "volume_l": 15.6
    },
    {
      "area_m2": 0.84,
      "at": [
        67.83,
        -8.72
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      "max_depth_mm": 38.0,
      "volume_l": 14.8
    },
    {
      "area_m2": 1.0,
      "at": [
        62.2,
        -15.88
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      "max_depth_mm": 27.9,
      "volume_l": 14.6
    },
    {
      "area_m2": 0.51,
      "at": [
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        -83.22
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      "max_depth_mm": 39.5,
      "volume_l": 12.7
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    {
      "area_m2": 0.84,
      "at": [
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        -66.72
      ],
      "max_depth_mm": 25.7,
      "volume_l": 12.2
    },
    {
      "area_m2": 1.11,
      "at": [
        -4.17,
        -48.48
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      "max_depth_mm": 21.6,
      "volume_l": 12.2
    },
    {
      "area_m2": 0.78,
      "at": [
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        -40.94
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      "max_depth_mm": 39.7,
      "volume_l": 9.0
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    {
      "area_m2": 0.52,
      "at": [
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        -11.7
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      "max_depth_mm": 31.0,
      "volume_l": 7.3
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    {
      "area_m2": 0.72,
      "at": [
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      "max_depth_mm": 13.0,
      "volume_l": 6.2
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    {
      "area_m2": 0.54,
      "at": [
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        40.62
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      "max_depth_mm": 19.2,
      "volume_l": 5.4
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  ],
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    {
      "csv": "section-1.csv",
      "from": [
        0.0,
        0.0
      ],
      "image": "section-1.png",
      "to": [
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        -18.3
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      "walls_crossed": [
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        "w5",
        "w30"
      ]
    },
    {
      "csv": "section-2.csv",
      "from": [
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        -68.6
      ],
      "image": "section-2.png",
      "to": [
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        -95.1
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      "walls_crossed": []
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    "frame_station": 1,
    "ground_cells": 1007141,
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      "rms_mm": 16.5,
      "slope_pct": 1.2,
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      "straightedge_windows": 105270
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    "low_spots": 23,
    "stations_used": 19,
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    "tolerance_mm": 6.0,
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      "features_pct": 35.0,
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        8,
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      "worst_strip_mm_per_m": 5.4
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      "straightedge_windows": 557,
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      "top_above_ground_m": 8.84,
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      "worst_strip_mm_per_m": 1.0
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      "flat_rms_mm": 29.3,
      "image": "wall-w22.png",
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      "out_of_plumb_mm": -79.0,
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      "top_above_ground_m": 12.84,
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    },
    {
      "covered_pct": 87.3,
      "features_pct": 33.3,
      "flat_p95_mm": 44.1,
      "flat_rms_mm": 24.1,
      "image": "wall-w23.png",
      "kind": "building",
      "lean_mm_per_m": 19.8,
      "length_m": 3.02,
      "out_of_plumb_mm": 174.3,
      "seen_by": [
        8,
        9,
        10,
        11
      ],
      "straightedge_ok_pct": 13.5,
      "straightedge_windows": 266,
      "straightedge_worst_mm": 94.7,
      "top_above_ground_m": 11.33,
      "wall_id": "w23",
      "worst_strip_at_m": 2.5,
      "worst_strip_mm_per_m": 20.5
    },
    {
      "covered_pct": 86.3,
      "features_pct": 60.3,
      "flat_p95_mm": 42.6,
      "flat_rms_mm": 23.1,
      "image": "wall-w24.png",
      "kind": "building",
      "lean_mm_per_m": -0.8,
      "length_m": 2.92,
      "out_of_plumb_mm": -8.4,
      "seen_by": [
        14,
        15,
        16,
        17
      ],
      "straightedge_ok_pct": 0.0,
      "straightedge_windows": 135,
      "straightedge_worst_mm": 79.3,
      "top_above_ground_m": null,
      "wall_id": "w24",
      "worst_strip_at_m": 1.5,
      "worst_strip_mm_per_m": -1.1
    },
    {
      "covered_pct": 81.3,
      "features_pct": 42.7,
      "flat_p95_mm": 44.2,
      "flat_rms_mm": 19.1,
      "image": "wall-w25.png",
      "kind": "building",
      "lean_mm_per_m": -1.0,
      "length_m": 2.76,
      "out_of_plumb_mm": -5.1,
      "seen_by": [
        5,
        6
      ],
      "straightedge_ok_pct": 0.0,
      "straightedge_windows": 3,
      "straightedge_worst_mm": 49.2,
      "top_above_ground_m": 6.52,
      "wall_id": "w25",
      "worst_strip_at_m": 0.5,
      "worst_strip_mm_per_m": -1.3
    },
    {
      "covered_pct": 76.1,
      "features_pct": 42.1,
      "flat_p95_mm": 17.5,
      "flat_rms_mm": 9.0,
      "image": "wall-w26.png",
      "kind": "building",
      "lean_mm_per_m": -4.4,
      "length_m": 2.36,
      "out_of_plumb_mm": -45.2,
      "seen_by": [
        14,
        15,
        16,
        17
      ],
      "straightedge_ok_pct": 51.0,
      "straightedge_windows": 143,
      "straightedge_worst_mm": 38.7,
      "top_above_ground_m": null,
      "wall_id": "w26",
      "worst_strip_at_m": 0.5,
      "worst_strip_mm_per_m": -4.8
    },
    {
      "covered_pct": 68.2,
      "features_pct": 52.1,
      "flat_p95_mm": 41.8,
      "flat_rms_mm": 17.4,
      "image": "wall-w27.png",
      "kind": "building",
      "lean_mm_per_m": 1.4,
      "length_m": 2.2,
      "out_of_plumb_mm": 7.0,
      "seen_by": [
        5,
        6
      ],
      "straightedge_ok_pct": null,
      "straightedge_windows": 0,
      "straightedge_worst_mm": null,
      "top_above_ground_m": 6.45,
      "wall_id": "w27",
      "worst_strip_at_m": 1.5,
      "worst_strip_mm_per_m": 2.0
    },
    {
      "covered_pct": 29.1,
      "features_pct": 42.1,
      "flat_p95_mm": 41.5,
      "flat_rms_mm": 18.3,
      "image": "wall-w28.png",
      "kind": "building",
      "lean_mm_per_m": -3.7,
      "length_m": 2.02,
      "out_of_plumb_mm": -18.5,
      "seen_by": [
        5,
        6
      ],
      "straightedge_ok_pct": null,
      "straightedge_windows": 0,
      "straightedge_worst_mm": null,
      "top_above_ground_m": 6.44,
      "wall_id": "w28",
      "worst_strip_at_m": 0.5,
      "worst_strip_mm_per_m": -6.0
    },
    {
      "covered_pct": 70.1,
      "features_pct": 48.1,
      "flat_p95_mm": 44.0,
      "flat_rms_mm": 22.6,
      "image": "wall-w29.png",
      "kind": "building",
      "lean_mm_per_m": 26.9,
      "length_m": 1.92,
      "out_of_plumb_mm": 190.4,
      "seen_by": [
        14,
        15,
        16,
        17
      ],
      "straightedge_ok_pct": 0.0,
      "straightedge_windows": 45,
      "straightedge_worst_mm": 95.8,
      "top_above_ground_m": null,
      "wall_id": "w29",
      "worst_strip_at_m": 0.5,
      "worst_strip_mm_per_m": 27.6
    },
    {
      "covered_pct": 70.3,
      "features_pct": 34.4,
      "flat_p95_mm": 41.4,
      "flat_rms_mm": 22.0,
      "image": "wall-w30.png",
      "kind": "building",
      "lean_mm_per_m": -4.7,
      "length_m": 1.86,
      "out_of_plumb_mm": -34.4,
      "seen_by": [
        8,
        9,
        10,
        11
      ],
      "straightedge_ok_pct": 0.0,
      "straightedge_windows": 49,
      "straightedge_worst_mm": 61.3,
      "top_above_ground_m": 8.96,
      "wall_id": "w30",
      "worst_strip_at_m": 0.5,
      "worst_strip_mm_per_m": -4.9
    },
    {
      "covered_pct": 66.9,
      "features_pct": 21.8,
      "flat_p95_mm": 43.9,
      "flat_rms_mm": 18.6,
      "image": "wall-w31.png",
      "kind": "building",
      "lean_mm_per_m": -0.9,
      "length_m": 1.83,
      "out_of_plumb_mm": -7.7,
      "seen_by": [
        6,
        7,
        8
      ],
      "straightedge_ok_pct": 28.6,
      "straightedge_windows": 49,
      "straightedge_worst_mm": 63.0,
      "top_above_ground_m": 9.01,
      "wall_id": "w31",
      "worst_strip_at_m": 1.5,
      "worst_strip_mm_per_m": -0.6
    },
    {
      "covered_pct": 91.2,
      "features_pct": 7.6,
      "flat_p95_mm": 36.9,
      "flat_rms_mm": 16.5,
      "image": "wall-w32.png",
      "kind": "building",
      "lean_mm_per_m": -0.5,
      "length_m": 1.76,
      "out_of_plumb_mm": -4.0,
      "seen_by": [
        6,
        7,
        8
      ],
      "straightedge_ok_pct": 81.8,
      "straightedge_windows": 203,
      "straightedge_worst_mm": 34.0,
      "top_above_ground_m": 8.95,
      "wall_id": "w32",
      "worst_strip_at_m": 1.5,
      "worst_strip_mm_per_m": -0.5
    },
    {
      "covered_pct": 58.0,
      "features_pct": 17.1,
      "flat_p95_mm": 43.9,
      "flat_rms_mm": 20.8,
      "image": "wall-w33.png",
      "kind": "building",
      "lean_mm_per_m": -0.7,
      "length_m": 1.75,
      "out_of_plumb_mm": -5.8,
      "seen_by": [
        6,
        7,
        8
      ],
      "straightedge_ok_pct": 55.0,
      "straightedge_windows": 40,
      "straightedge_worst_mm": 55.5,
      "top_above_ground_m": 8.37,
      "wall_id": "w33",
      "worst_strip_at_m": 0.5,
      "worst_strip_mm_per_m": -0.6
    }
  ]
}