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Great-Circle Route Densifier

Add evenly spaced points between route waypoints without losing the originals.

One signed latitude, longitude pair per line. Commas, semicolons, spaces and # comment lines are accepted.

kilometres; each original leg is divided into equal great-circle steps no longer than this

Choose Densify route to generate the sample LineString.

Uses shortest great-circle arcs on a mean-radius sphere (6,371,008.8 m), not an ellipsoid; for plotting and data preparation, not navigation or surveying. Consecutive duplicate points are preserved. Antipodal legs are refused because no unique shortest arc exists. All processing stays in your browser.