{
  "image": "measurement-overhead.jpg",
  "georeference": "overhead-export-supported.json",
  "source": "Esri World Imagery / Vantor, capture 2025-03-02 at checked site point",
  "method": "Manual pixel endpoints on visible paving transitions; inverse Web Mercator then geodesic approximation. Visible paved spans, not surveyed curb-to-curb widths or public property limits.",
  "uncertainty": "Working interpretation allowance ±2m for edge ambiguity/roof lean/shadow. Not a statistical confidence interval and not derived from 0.5m native pixel size. Obscured margins may extend beyond visible span.",
  "transects": [
    {
      "id": "T1",
      "label": "Amana oeste · San Pedro–San Ernesto",
      "a": [
        155,
        184
      ],
      "b": [
        160,
        210
      ],
      "interpretation_allowance_m": 2,
      "evidence": "Paved surface between canopy and frontage; both edges partly ambiguous. Low confidence; do not infer sidewalk clearance.",
      "geographic_endpoints": [
        [
          -66.8620830128205,
          10.434909448492366
        ],
        [
          -66.86206794871795,
          10.43483241068094
        ]
      ],
      "visible_span_m": 8.723174696604318,
      "working_range_m": [
        6.7231746966043175,
        10.723174696604318
      ]
    },
    {
      "id": "T2",
      "label": "Amana este · frente comercial",
      "a": [
        500,
        110
      ],
      "b": [
        508,
        150
      ],
      "interpretation_allowance_m": 2,
      "evidence": "Visible paved apron/road span; curb, forecourt and ownership not separable. Low confidence for usable public width.",
      "geographic_endpoints": [
        [
          -66.86104358974359,
          10.43512870985124
        ],
        [
          -66.86101948717948,
          10.43501019021698
        ]
      ],
      "visible_span_m": 13.439773355045627,
      "working_range_m": [
        11.439773355045627,
        15.439773355045627
      ]
    },
    {
      "id": "T3",
      "label": "Amana este · llegada a Campus",
      "a": [
        590,
        91
      ],
      "b": [
        596,
        122
      ],
      "interpretation_allowance_m": 2,
      "evidence": "Visible paving before the junction; roof displacement can obscure the southern ground edge. Low confidence.",
      "geographic_endpoints": [
        [
          -66.86077243589745,
          10.43518500666169
        ],
        [
          -66.86075435897436,
          10.435093153965713
        ]
      ],
      "visible_span_m": 10.403099824614904,
      "working_range_m": [
        8.403099824614904,
        12.403099824614904
      ]
    }
  ],
  "not_measurable_from_this_image": [
    "Sidewalk clear width",
    "Channel invert or depth",
    "Crossfall and longitudinal slope",
    "Flood level or capacity",
    "Subsurface services",
    "Retaining-wall capacity",
    "Cadastral boundary"
  ],
  "image_sha256": "01443e77d3f1ef227400994636dcd972a6e9145b552d66bf433a8e1cf874ab6a",
  "sample_ground_pixel_m": 0.32947002172290635,
  "native_resolution_m": 0.5,
  "reported_source_position_accuracy_m": 8.47
}