Terrain visibility analysis
Mont-Saint-Michel from Avranches
A coastal monument example across the bay, combining low terrain with a target whose height above ground must be stated.
This page explains a reproducible Sightelo case. The result is recalculated on demand with the available elevation data; it is not a guaranteed real-world observation.
Open and recalculate this analysisPoints and assumptions
- Observation point
- Avranches, France
- Point of interest
- Mont-Saint-Michel, France
- Geodesic distance
- 12.6 km
- Initial bearing
- 244.8° (west-southwest)
- Refraction
- Standard (k = 0.13)
What this example helps you study
Open the analysis to inspect the terrain profile, minimum sight line, visible part of the target and confidence level. Then change observer height, refraction or sampling interval to measure their influence.
Limits of interpretation
The calculation models terrain, Earth curvature and standard atmospheric refraction. It does not model buildings, trees, clouds, haze or local atmospheric variations.