{
  "schema": 1,
  "pack_id": "wall-street-observatory",
  "units": "metres",
  "axes": "x east, y up from 2300 NAVD88 m, z south",
  "transects": [
    {
      "id": "a",
      "row": 24,
      "z_m": -100.0,
      "north_of_center_m": 100.0,
      "sample_strip_width_m": 5,
      "sample_returns_in_strip": 1487,
      "min_m": 2373.45,
      "max_m": 2432.72,
      "relief_m": 59.26999999999998
    },
    {
      "id": "b",
      "row": 44,
      "z_m": -50.0,
      "north_of_center_m": 50.0,
      "sample_strip_width_m": 5,
      "sample_returns_in_strip": 1913,
      "min_m": 2350.71,
      "max_m": 2420.32,
      "relief_m": 69.61000000000013
    },
    {
      "id": "c",
      "row": 64,
      "z_m": 0.0,
      "north_of_center_m": 0,
      "sample_strip_width_m": 5,
      "sample_returns_in_strip": 1905,
      "min_m": 2343.02,
      "max_m": 2415.43,
      "relief_m": 72.40999999999985
    }
  ],
  "plates": [
    {
      "id": "ws80-plate-01",
      "file": "plates/01-plan.svg",
      "title": "A small window",
      "caption": "Locate three analytical cuts in the 320 m crop. The colors show the derived elevation, not photographed rock.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-02",
      "file": "plates/02-oblique.svg",
      "title": "An upper envelope",
      "caption": "The oblique projection shows how a top surface joins neighboring heights. It does not add the unseen sides of the rock.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-03",
      "file": "plates/03-returns.svg",
      "title": "The observations",
      "caption": "12,000 points, selected every tenth item from the accepted 120,000-return sample. A gap between points is not evidence of empty air.",
      "evidence_class": "measured",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-04",
      "file": "plates/04-section-a.svg",
      "title": "Cut A \u00b7 north",
      "caption": "Read a true-scale section 100 m north of center. Dots within \u00b12.5 m are projected into the cut; they need not lie on the line.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-05",
      "file": "plates/05-section-b.svg",
      "title": "Cut B \u00b7 middle",
      "caption": "Read a true-scale section 50 m north of center. The profile is a derived upper envelope, with imperfect vegetation filtering.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-06",
      "file": "plates/06-section-c.svg",
      "title": "Cut C \u00b7 center",
      "caption": "Compare the section at the crop center. Changes between cuts describe this dataset, not changes over time.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-07",
      "file": "plates/07-support.svg",
      "title": "Coverage has a direction",
      "caption": "A densely supported horizontal grid can coexist with unobserved vertical walls. Direct and filled nodes describe grid support only.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    },
    {
      "id": "ws80-plate-08",
      "file": "plates/08-dimensions.svg",
      "title": "A length needs endpoints",
      "caption": "Two chosen nodes are 80 m apart. Their elevation difference is not a wall height; their separation is not passage clearance.",
      "evidence_class": "derived",
      "source_ids": [
        "usgs-lidar"
      ]
    }
  ],
  "views": [
    {
      "id": "surface",
      "title": "The upper envelope",
      "question": "Which shapes survive a view from above?",
      "limit": "A steep connecting face is not a wall scan."
    },
    {
      "id": "returns",
      "title": "The measured returns",
      "question": "Where did the instrument record an echo?",
      "limit": "The 120,000-point display is a sample; empty screen space is not proven air."
    },
    {
      "id": "aerial",
      "title": "The overhead image",
      "question": "What did an aerial camera see?",
      "limit": "2024 overhead pixels cannot recover hidden walls or validate changes since 2018."
    },
    {
      "id": "section",
      "title": "A slice through the data",
      "question": "What can a profile tell us about width and height?",
      "limit": "Derived profile relief is not wall height. Dots are projected from a 5 m wide strip."
    }
  ]
}