be drainage tendency derived

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    "example": {
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        "measurements": {
          "drainage-tendency": {
            "name": "Surface drainage tendency",
            "unit": "index_0_100",
            "value": 1,
            "method": "documented source raster sample",
            "metric": "drainage-tendency",
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        "Preliminary geodata assessment; not a legally binding property, cadastral, planning, environmental or title search.",
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          "name": "Copernicus DEM GLO-30 Full, Free & Open",
          "caveats": [
            "Digital surface model: vegetation and structures can raise the measured surface above bare earth.",
            "Values over water and source voids may be unavailable."
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          "purpose": "Surface elevation and deterministic terrain derivatives.",
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      ],
      "summary": "Belgium: Surface drainage tendency: source-backed screening evidence was calculated successfully.",
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        "Verify material findings with current cadastral, planning and environmental records from the competent authority.",
        "Commission a qualified on-site survey where parcel-scale conditions affect the decision."
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