RF ENGINEERING // PROPAGATION // TERRAIN ANALYSIS

LOS / Terrain Profile Tool

Professional line-of-sight and topographic path analysis between any two Maidenhead grid squares. Computes great-circle terrain profile, effective-Earth curvature, Fresnel zone clearance, radio horizon distances, and worst-case obstruction table — all in the browser.

Great-Circle Path 4/3 Re Effective Earth Fresnel Zone F1/60% Radio Horizons A&B OpenTopoData SRTM Metric / Imperial CSV Export Interactive Map
Datasets: SRTM 90m · SRTM30m · ASTER 30m · ETOPO1
Max samples: 500 pts · API: opentopodata.org
Supports 2–10 char Maidenhead precision
Parameters
Station A — Grid Locator
Station B — Grid Locator
Antenna Height AGL
Station A
m AGL
Station B
m AGL
k-factor (eff. Earth)
std = 4/3 = 1.333
Frequency (MHz)
for Fresnel calc
Profile Samples
DEM Dataset
Show 60% Fresnel Zone
Show Radio Horizons A & B
Smooth Elevation (7-pt MA)
Show Earth Bulge Curve
Display Units
Enter grids and click Plot LOS Profile
Topographic Profile with LOS & Fresnel Zone
Fetching elevation data…
Interactive Great-Circle Map