Terrain visibility analysis
Canigou from Marseille
A 253 km Mediterranean sight line from Marseille towards Canigou, where curvature, coastal relief and atmospheric refraction become critical.
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
- Marseille, France
- Point of interest
- Canigou, France
- Geodesic distance
- 253.1 km
- Initial bearing
- 251.0° (west-southwest)
- Refraction
- Standard (k = 0.13)
What this example helps you study
This is a deliberately demanding long-distance case. The terrain model can establish whether a geometric line is possible, but reports at this scale are especially sensitive to observer elevation, exceptional refraction and the transparency of the air above the Mediterranean.
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.