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  "attribution": "Mapzen; SRTM/GMTED2010 terrain data courtesy of the U.S. Geological Survey",
  "modifications": "bilinear resampling; gridSpacingMeters records sampling, not source accuracy; display scaling recorded in city metadata",
  "center": [
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  "sourceSizeKm": 24,
  "renderBoundsWorld": [
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  "renderExtentKm": [
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      "way",
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      5940862
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      "relation",
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      "id": 7543658404,
      "type": "node",
      "position": [
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  "terrain": "Independent 46.875m sampled DEM, Gaussian 0.85, 3.2x relief. Sampling is not source accuracy; not lidar.",
  "urban": "Mapped residential land cover, no generated city grid.",
  "landmarks": "Aiwan Pavilion at mapped heritage node, stylized double-eaved square pavilion, approximate 8x visual enlargement; not a measured reconstruction.",
  "sources": [
    "https://www.hunan.gov.cn/hnszf/c101474/202108/t20210827_20403826.html",
    "https://whhlyt.hunan.gov.cn/ggwh/201408/t20140804_5430585.html",
    "https://zrzyt.hunan.gov.cn/xxgk/qtxx/sxfc/201703/t20170328_4166473.html"
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}