{
  "provenance": "Synthetic boundary cases derived from the public LD2450 coordinate contract in issue #485; no contributed observations are copied.",
  "projection": [
    {
      "name": "LD2450 centre line keeps a zero X axis",
      "mount": [0.5, 0.5],
      "heading_deg": 0,
      "mirror": false,
      "cell_cm": 5,
      "local": [0, 1000],
      "unit": "mm",
      "expected": [0.5, 0.4166666666666667]
    },
    {
      "name": "LD2450 signed left coordinate keeps a zero Y axis",
      "mount": [0.5, 0.5],
      "heading_deg": 0,
      "mirror": false,
      "cell_cm": 5,
      "local": [-1200, 0],
      "unit": "mm",
      "expected": [0.4, 0.5]
    },
    {
      "name": "Imperial generic source uses the exact factor",
      "mount": [0.25, 0.75],
      "heading_deg": 90,
      "mirror": true,
      "cell_cm": 1,
      "local": [10, 0],
      "unit": "in",
      "expected": [0.25, 0.6441666666666667]
    }
  ]
}