Start with a manually curated reference point for London, United Kingdom. The circle calculates straight-line distance, not driving distance.
London: draw a 10 km radius
Start from Charing Cross area, change the radius or center, then export a GeoJSON circle. The starter map covers approximately 314.16 km² on a flat-circle approximation.
What makes the London map different?
The Thames crosses the center; a radius can span multiple boroughs and is not a commuter-rail catchment.
As a practical example, a company might draw this circle to screen places for a service area. That does not prove those places can be reached within a particular time. Road, ferry and transit routes should be checked separately.
How to use this city radius map
- Review the starter coordinate near Charing Cross area.
- Change the radius or switch miles and kilometers.
- Click another point on the map to reposition the center.
- Copy a shareable link or export GeoJSON for a GIS workflow.
Measurement details
| Starting point | Charing Cross area |
|---|---|
| Latitude, longitude | 51.5074, -0.1278 |
| Default radius | 10 km |
| Approximate circle area | 314.16 km² |
| Dataset type | Illustrative city-center point, not municipal polygon |
Frequently asked questions
Does this circle follow roads in London?
No. The map calculates distances along the Earth’s surface, not drive time or route distance.
Can I move the center away from Charing Cross area?
Yes. Click the map or enter a new coordinate to reposition it.
Does the calculated area equal developed urban land?
No. The circle may include water, fields, mountains and neighboring municipalities.
Can I share the map?
Yes. Use the Copy link control to share a prefilled map with coordinates and radius.
Accuracy: spherical-Earth approximation, city point manually curated. Content and coordinates require local editorial verification before publishing city-specific pages. Calculation methodology.