{
  "id": "ontario-terrain-visible-area-proof",
  "image": "https://gta-gis-assets.pages.dev/analysis/terrain-visibility/ontario-visible-area.png?v=2026-08-27T00%3A08%3A58.656Z",
  "data": "https://gta-gis-assets.pages.dev/analysis/terrain-visibility/ontario-visible-area.json?v=2026-08-27T00%3A08%3A58.656Z",
  "bounds": [
    -97.174072265625,
    41.48389104267176,
    -72.322998046875,
    58.86490457903923
  ],
  "displayRangeKm2": {
    "low": 69,
    "high": 828,
    "percentiles": [
      2,
      98
    ]
  },
  "analysis": {
    "observerStridePixels": 1,
    "targetStridePixels": 1,
    "lineOfSightStridePixels": 1,
    "approximateGridSpacingKm": 1.59,
    "approximateObserverSpacingKm": 1.59,
    "approximateTargetSpacingKm": 1.59,
    "approximateLineOfSightSpacingKm": 1.59,
    "workers": 8,
    "computationSeconds": 96.83,
    "maxDistanceKm": 100,
    "observerHeightM": 1.7,
    "targetHeightM": 0,
    "curvature": "7/6 effective Earth radius; standard atmospheric refraction approximation",
    "algorithm": "dda",
    "lineOfSight": "DDA over the sampled DEM"
  },
  "caveat": "United States terrain and visible area are deliberately excluded, so values near the international border are underestimated."
}