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Remote sensing — radiance to validated surface product

Trace a satellite observation through radiometric calibration, atmospheric correction and geolocation. Compare retrieved surface quantities with independent observations while preserving cloud and quality masks.

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{
  "nodes": [
    { "id": "rad", "type": "rounded", "label": "At-sensor radiance", "x": 40, "y": 200, "width": 150, "height": 104, "fill": "#ede9fe", "stroke": "#6d28d9" },
    { "id": "cal", "type": "rounded", "label": "Radiometric calibration", "x": 215, "y": 200, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "atm", "type": "rounded", "label": "Atmospheric correction", "x": 390, "y": 200, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "geo", "type": "rounded", "label": "Geolocation / resampling", "x": 565, "y": 200, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "ret", "type": "rounded", "label": "Surface-property retrieval", "x": 740, "y": 200, "width": 150, "height": 104, "fill": "#fef3c7", "stroke": "#b45309" },
    { "id": "mask", "type": "octagon", "label": "Cloud and quality masks", "x": 390, "y": 520, "width": 150, "height": 104, "fill": "#e0f2fe", "stroke": "#0369a1" },
    { "id": "ground", "type": "card", "label": "Independent reference observations", "x": 740, "y": 520, "width": 150, "height": 104, "fill": "#ccfbf1", "stroke": "#0f766e" },
    { "id": "valid", "type": "rounded", "label": "Validation and uncertainty", "x": 915, "y": 200, "width": 150, "height": 104, "fill": "#fce7f3", "stroke": "#be185d" }
  ],
  "edges": [
    { "id": "e0", "source": "rad", "target": "cal", "label": "sensor response" },
    { "id": "e1", "source": "cal", "target": "atm", "label": "calibrated observation" },
    { "id": "e2", "source": "atm", "target": "geo", "label": "surface estimate" },
    { "id": "e3", "source": "geo", "target": "ret", "label": "aligned pixels" },
    { "id": "e4", "source": "mask", "target": "ret", "label": "quality selection", "style": "dashed" },
    { "id": "e5", "source": "ret", "target": "valid", "label": "product" },
    { "id": "e6", "source": "ground", "target": "valid", "label": "independent comparison" }
  ]
}