About the Line of Sight Visibility Tool Online Free Tool

The Line of Sight Visibility Tool Online Free Tool estimates horizon distances and midpoint curvature bulge for a two-point visibility check.

How to Use the Line of Sight Visibility Tool Online

1. Enter path distance, observer height, target height, and refraction coefficient.
2. Run the tool to review curvature bulge and combined horizon distance.
3. Use the result as a theoretical check before terrain analysis.

Choosing Options Correctly

This tool ignores terrain, vegetation, buildings, Fresnel zones, and atmospheric variability beyond a simple refraction coefficient. Use DEM/profile tools for real site visibility.

Common Use Cases

• Screen radio or optical line-of-sight feasibility.
• Estimate horizon distance from tower height.
• Understand Earth-curvature effects.

Quick FAQ

Does visible mean unobstructed?
No. It only checks a simplified curvature-based horizon condition. It does not know about trees, buildings, terrain ridges, or towers.

What does refraction coefficient do?
It increases effective Earth radius in the simplified model, approximating atmospheric refraction.

Can I use this for radio path design?
Only as a screening check. Radio links need terrain profiles, Fresnel zone clearance, antenna heights, and frequency-specific analysis.

Why can real-world visibility differ?
Atmosphere, local obstructions, elevation data, and terrain between points can all change the actual result.