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    "title": "USGS Karst Sinkhole Risk Screener — Geohazard by Coordinate",
    "description": "Karst & sinkhole-risk screener: batch point-in-polygon over the USGS national CONUS_Karst compilation (7 layers: carbonate, evaporite, sandstone karst + pseudokarst). Returns in_karst_terrain, karst type, near-surface vs buried, rock unit, and an editorial sinkhole-risk tier per coordinate.",
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                "lat": 28.54,
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