Great Circle Route Generator
Generate a GeoJSON great-circle line between two WGS84 coordinates with a selectable number of interpolation points entirely in-browser.
Input
Great-circle output is not a road, rail, walking, or maritime route and may cross restricted areas or the antimeridian.
Review these warnings
GeoJSON
Map preview
Understanding Great Circle Route Generator
Coordinate systems, order and units
Generate a GeoJSON great-circle line between two WGS84 coordinates with a selectable number of interpolation points entirely in-browser.
Great Circle Route Generator depends on knowing how coordinates are expressed. Geographic coordinates commonly use WGS84 longitude and latitude, while projected systems use linear units and a defined datum and projection.
How to verify the coordinates
Great-circle output is not a road, rail, walking, or maritime route and may cross restricted areas or the antimeridian.
To verify Great Circle Route Generator, spot-check a known place, confirm axis order and verify the expected unit and CRS. A numerically valid coordinate can still be geographically wrong when those assumptions are incorrect.