What can you see from Alcatraz Island?
360° terrain visibility analysis from Alcatraz Island — observation point at 74 m, coordinates 37.8264, -122.4228.
From Alcatraz Island, the terrain-limited line of sight reaches up to 112 km. The single farthest piece of visible terrain lies 112 km to the southeast (bearing 135°), at 740 m elevation. These results account for Earth's curvature and standard atmospheric refraction, computed from 30-meter resolution Copernicus GLO-30 elevation data across 1,927,649 terrain samples.
Open the interactive visibility map →Visibility by direction
| Direction | Visible distance |
|---|---|
| North | 71.9 km |
| East | 112 km |
| South | 96.2 km |
| West | 32.6 km |
Frequently asked questions
How far can you see from Alcatraz Island?
On a clear day the terrain allows a line of sight of up to 112 km from Alcatraz Island. The average visible distance across all 360 directions is 28.1 km. Atmospheric conditions (haze, humidity) usually reduce practical visibility below the terrain-limited maximum.
What is the farthest point visible from Alcatraz Island?
The farthest terrain visible from Alcatraz Island lies 112 km to the southeast, at an elevation of 740 m. Earth's curvature and atmospheric refraction are accounted for in this calculation.
How high is Alcatraz Island?
The observation point at Alcatraz Island sits at 74 m above sea level (Copernicus GLO-30 elevation model).
How is this visibility map calculated?
UpToWhere traces lines of sight in 360 directions from the observer using 30 m-resolution Copernicus terrain data, correcting for Earth curvature and standard atmospheric refraction. You can run the same analysis for any point on Earth with the free calculator.
Run your own analysis
Want to know what you can see from your house, a summit you're planning to climb, or a plot of land? UpToWhere computes the same 360° viewshed for any point on Earth in seconds — free.
Try the viewshed calculator