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  "surface": "Mapped contemporary river/lake polygons and islands. Fixed artistic water level. DEM median filter 3 + Gaussian 1.1; 110m bank feather. Flow follows OSM river-node order and is clipped to river polygons; no directional lake flow, no live hydrology.",
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  "vegetation": "Mapped park/forest coverage, procedural canopy; not individual tree survey.",
  "sources": [
    "https://www.wuhan.gov.cn/zjwh/whgk/202004/t20200414_999422.shtml",
    "https://www.wuhan.gov.cn/ztzl/25zt/qiao/whzjdq/index.shtml",
    "https://www.wuhan.gov.cn/zwgk/xxgk/ghjh/nsgh/202003/t20200316_970606.shtml"
  ]
}