Land Survey Screening – Great-Circle Distance and Bearing

Choose this endpoint when you need precise great-circle (geodesic) distance and directional bearing between two geographic coordinate pairs, especially in surveying, navigation, or geospatial analysis contexts. It is ideal when you need results in multiple unit systems simultaneously (miles, km, feet, nautical miles). Prefer it over geocoding-based distance tools when you already have exact lat/lon values and don't need routing or road-network distances.

• Missing required query parameters (lat1, lon1, lat2, lon2) returns a validation error
• Out-of-range latitude (outside ±90) or longitude (outside ±180) values cause an error
• Identical start and end points return zero distance and undefined or null bearing
• Payment failure or insufficient USDC balance blocks the request
• Network timeout or service unavailability returns a degraded or null response