de ruggedness derived

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    "example": {
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        "measurements": {
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            "unit": "m_sd",
            "value": 1,
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            "metric": "ruggedness",
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        "Preliminary geodata assessment; not a legally binding property, cadastral, planning, environmental or title search.",
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      "charged": true,
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          "caveats": [
            "Digital surface model: vegetation and structures can raise the measured surface above bare earth.",
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      "summary": "Germany: Terrain ruggedness: 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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