{
  "window_wgs84": [
    86.7494,
    27.9928,
    86.9278,
    28.1336
  ],
  "px": "820x820 @ 10m/px",
  "scenes": {
    "s2_20181020_clean.png": "S2A_45RVM_20181020_0_L2A (2018-10-20, cloud 0.07%)",
    "s2_20241107_clean.png": "S2A_45RVM_20241107_0_L2A (2024-11-07, cloud 0.01%)"
  },
  "note": "clean renders: raw Sentinel-2 TCI, no boundary/annotation baked in",
  "effective_pixel_size": {
    "lon_m_per_px": 21.4,
    "lat_m_per_px": 19.0,
    "note": "原始波段名义 10m；本页 820x820 窗口渲染为重采样预览，实际约 19-21 m/px"
  }
}