Terrain visibility analysis

Can you see Monviso from Turin?

Short answer: Yes, theoretically, from this exact point at Piazza Castello in central Turin. The Monviso summit clears the modelled terrain horizon over 64.9 km; buildings and weather may still hide it.

Can you see Monviso from central Turin? Sightelo analyses the 64.9 km line from Piazza Castello to the summit, including terrain, curvature and refraction.

View the calculation in Sightelo

Key figures

Observation point: Piazza Castello, central Turin, Italy; Latitude, longitude: 45.070158, 7.685055; Eye height: 1.7 m
Point of interest: Monviso, Italy
Target elevation: 3,841 m
Straight-line distance: 64.9 km
Direction to the summit: 226.6° (southwest)
Modelled summit clearance: +1,013 m

Terrain profile and line of sight

Detailed profile

Scroll horizontally to explore the full profile on a small screen.

Calculated terrain
Observer–summit sight line
Minimum visibility line
0 m reference (modelled curvature)

Terrain already includes modelled curvature and refraction (k = 0.13). The grey curve is the 0 m reference: subtract it from the terrain curve to read real elevation. Sight lines remain straight; no second curvature correction is applied. Vertical and horizontal scales differ.

At the summit, the target clears the modelled horizon by 1012.7 m. No blocking terrain is calculated. The relief forming the horizon is 55.128 km from A.

Calculated profile values

Distance (km)	64.9 km
Observer eye altitude	247.6 m
Summit altitude	3841.0 m
Minimum visible target altitude	2828.3 m
Target margin above the modelled horizon	+1012.7 m
Minimum local sight-line clearance	+11.4 m
Displayed / calculated samples	498 / 651
Excluded around A / B	200 m / 1398 m
Horizon-forming relief	55.1277 km

Audited calculation: 2026-10-09. The interactive calculator can recalculate with currently available elevation data.

What this example helps you study

The line runs southwest from Piazza Castello towards the isolated Monviso summit. Sightelo finds no blocking terrain after excluding the first 200 m around the observer; the summit is about 1,013 m above the minimum elevation needed to clear the modelled horizon. This is a terrain result, not a promise of a view between city buildings.

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.

Technical details

Observation point coordinates: 45.070158, 7.685055
Summit coordinates: 44.667460, 7.090010
Terrain model: Copernicus DEM 90
Eye height: 1.7 m
Refraction used: Standard (k = 0.13)
Sample step: 100 m
Uncertainty threshold: 30 m
Observer exclusion radius: 200 m
Requested summit exclusion radius: 600 m

A positive value means the summit clears the modelled terrain horizon. A negative value means the summit lies below the minimum elevation required to clear that horizon. This value is not the local height of blocking terrain above the sight line.