{
  "schemaVersion": 1,
  "generatedAt": "2026-09-17T03:27:12.027Z",
  "point": {
    "lat": 31.16,
    "lng": 101.37,
    "label": "党岭山域"
  },
  "method": "父瓦片最近邻放大 2× 与 4 张子瓦片拼接做逐像素比对；MAD 小且高频增益≈1 说明子级只是插值放大。",
  "caveat": "MAD 偏大也可能来自瓦片边缘接缝或不同成像时相，因此只在同一源、同一时相内纵向比较，不跨源比。",
  "rows": [
    {
      "source": "tianditu",
      "from": 14,
      "to": 15,
      "note": "待测（天地图 img_w）",
      "mad": 12.585,
      "rms": 17.909,
      "lapParent": 24.222,
      "lapChild": 70.399,
      "lapGain": 2.906
    },
    {
      "source": "tianditu",
      "from": 15,
      "to": 16,
      "note": "待测",
      "mad": 15.336,
      "rms": 23.132,
      "lapParent": 38.237,
      "lapChild": 89.829,
      "lapGain": 2.349
    },
    {
      "source": "tianditu",
      "from": 16,
      "to": 17,
      "note": "待测",
      "mad": 21.512,
      "rms": 31.575,
      "lapParent": 54.464,
      "lapChild": 70.252,
      "lapGain": 1.29
    },
    {
      "source": "tianditu",
      "from": 17,
      "to": 18,
      "note": "待测",
      "mad": 10.954,
      "rms": 14.19,
      "lapParent": 50.203,
      "lapChild": 25.63,
      "lapGain": 0.511
    },
    {
      "source": "tianditu",
      "from": 18,
      "to": 19,
      "note": "待测（z19 返回 PNG，疑占位图）",
      "mad": 91.958,
      "rms": 98.437,
      "lapParent": 24.355,
      "lapChild": 14.301,
      "lapGain": 0.587
    },
    {
      "source": "google",
      "from": 16,
      "to": 17,
      "note": "已知真实（Google 区域高清）",
      "mad": 17.369,
      "rms": 23.413,
      "lapParent": 38.154,
      "lapChild": 85.296,
      "lapGain": 2.236
    },
    {
      "source": "google",
      "from": 17,
      "to": 18,
      "note": "已知真实",
      "mad": 18.898,
      "rms": 25.077,
      "lapParent": 45.618,
      "lapChild": 82.731,
      "lapGain": 1.814
    },
    {
      "source": "google",
      "from": 18,
      "to": 19,
      "note": "已知插值（增益 <1）",
      "mad": 15.291,
      "rms": 20.431,
      "lapParent": 48.448,
      "lapChild": 43.443,
      "lapGain": 0.897
    },
    {
      "source": "bing",
      "from": 16,
      "to": 17,
      "note": "已知真实",
      "error": "load fail https://ecn.t0.tiles.virtualearth.net/tiles/a1320300020212103.jpeg?g=1"
    },
    {
      "source": "bing",
      "from": 17,
      "to": 18,
      "note": "已知插值",
      "mad": 7.33,
      "rms": 9.589,
      "lapParent": 23.378,
      "lapChild": 22.018,
      "lapGain": 0.942
    },
    {
      "source": "esri",
      "from": 16,
      "to": 17,
      "note": "已知真实",
      "mad": 10.378,
      "rms": 14.072,
      "lapParent": 25.327,
      "lapChild": 37.723,
      "lapGain": 1.489
    },
    {
      "source": "esri",
      "from": 17,
      "to": 18,
      "note": "已知插值",
      "mad": 8.602,
      "rms": 11.535,
      "lapParent": 23.991,
      "lapChild": 25.84,
      "lapGain": 1.077
    }
  ]
}