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  "modifications": "bilinear resampling; gridSpacingMeters records sampling, not source accuracy; display scaling recorded in city metadata",
  "center": [
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    ],
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      "type": "node",
      "position": [
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      "position": [
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  "water": "Mapped Yellow River banks and island holes; fixed artistic surface with 65m bank buffer and 100m feather; route-order flow trails, not real-time hydrology.",
  "terrain": "Independent 54.6875m sampled DEM, Gaussian 0.85, 2x relief. Sampling is not source accuracy; not lidar.",
  "urban": "Mapped residential land cover, no generated city grid.",
  "landmarks": "Zhongshan Bridge follows mapped endpoints; five arched truss spans, width/detail enlarged for viewing. White Pagoda at mapped node, 4x scale, seven octagonal tiers; interpretive geometry.",
  "sources": [
    "https://dfzb.lanzhou.gov.cn/art/2017/10/16/art_9606_518474.html",
    "https://geo.ecnu.edu.cn/8c/cd/c42724a625869/page.htm",
    "https://gs.cnr.cn/gslv/zx/201112/t20111228_508986429.shtml"
  ]
}