{
 "schemaVersion": 1,
 "generatedAt": "2026-09-17T03:59:28.186Z",
 "question": "TILEMATRIXSET=w 的天地图瓦片是否与 EPSG:3857 的 XYZ 索引一一对应（可与 Leaflet 直接叠）？",
 "method": "同一 z/x/y 取天地图与 Esri/Google 瓦片，降采样成 48×48 灰度算 NCC；并在 ±1 的九宫格里扫峰值。峰值落在 (0,0) 即索引对齐。",
 "caveat": "影像来源不同（不同卫星、不同时相），NCC 绝对值不高是正常的；判定依据是峰值的**位置**，不是绝对值。",
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   "centerNCC": 0.6958,
   "bestNCC": 0.6958,
   "bestOffset": "0,0",
   "aligned": true,
   "scores": [
    {
     "dx": -1,
     "dy": -1,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54052/102659",
     "ncc": 0.1084
    },
    {
     "dx": 0,
     "dy": -1,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54052/102660",
     "ncc": 0.0345
    },
    {
     "dx": 1,
     "dy": -1,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54052/102661",
     "ncc": 0.0102
    },
    {
     "dx": -1,
     "dy": 0,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54053/102659",
     "ncc": -0.0323
    },
    {
     "dx": 0,
     "dy": 0,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54053/102660",
     "ncc": 0.6958
    },
    {
     "dx": 1,
     "dy": 0,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54053/102661",
     "ncc": 0.0756
    },
    {
     "dx": -1,
     "dy": 1,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54054/102659",
     "ncc": -0.0006
    },
    {
     "dx": 0,
     "dy": 1,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54054/102660",
     "ncc": -0.0478
    },
    {
     "dx": 1,
     "dy": 1,
     "url": "https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/17/54054/102661",
     "ncc": -0.1736
    }
   ]
  },
  {
   "point": "康定城区",
   "z": 17,
   "other": "google",
   "centerNCC": 0.251,
   "bestNCC": 0.251,
   "bestOffset": "0,0",
   "aligned": true,
   "scores": [
    {
     "dx": -1,
     "dy": -1,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102659&y=54052&z=17",
     "ncc": 0.1072
    },
    {
     "dx": 0,
     "dy": -1,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102660&y=54052&z=17",
     "ncc": 0.1136
    },
    {
     "dx": 1,
     "dy": -1,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102661&y=54052&z=17",
     "ncc": 0.0154
    },
    {
     "dx": -1,
     "dy": 0,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102659&y=54053&z=17",
     "ncc": 0.0232
    },
    {
     "dx": 0,
     "dy": 0,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102660&y=54053&z=17",
     "ncc": 0.251
    },
    {
     "dx": 1,
     "dy": 0,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102661&y=54053&z=17",
     "ncc": 0.0699
    },
    {
     "dx": -1,
     "dy": 1,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102659&y=54054&z=17",
     "ncc": -0.0924
    },
    {
     "dx": 0,
     "dy": 1,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102660&y=54054&z=17",
     "ncc": -0.121
    },
    {
     "dx": 1,
     "dy": 1,
     "url": "https://mt1.google.com/vt/lyrs=s&x=102661&y=54054&z=17",
     "ncc": -0.1373
    }
   ]
  }
 ],
 "verdict": "对齐：天地图 w 矩阵集就是 EPSG:3857，可直接作为 Leaflet 的 {z}/{x}/{y} 图层，无需任何坐标处理。"
}