Random Geographic Coordinates
Picks random (lat, lng) pairs using crypto.getRandomValues. The default "uniform on sphere" mode samples by the sine of latitude — a flat latitude pick would over-sample near the poles since each degree-band covers less surface area there. Bounding boxes that wrap across the antimeridian (e.g. Pacific-spanning) are handled, and each result links straight to OpenStreetMap to inspect.
Uniform on sphere weights latitude by sin — fair surface-area sampling. Turn off for flat latitude spacing.
Press Generate to pick coordinates.
All randomness via crypto.getRandomValues. Antimeridian-spanning longitudes (west > east) are supported.
How to use
- Pick a preset bbox or set north/south/west/east manually (negative = south/west).
- Choose how many points to generate.
- Toggle uniform-on-sphere off if you want flat latitude sampling (useful for grid-style picks).
Frequently asked questions
- Why are most points in the ocean?
- About 71% of Earth's surface is water, so uniform sampling lands there most of the time. Tighten the bounding box to a region of interest, or use the "land bias" preset for a crude land-weighted draw.
- What's the difference between the two sampling modes?
- Uniform-on-sphere gives equal area per point. Flat-latitude gives equal latitudinal spacing — fine for grids or quick scatterplots, but density rises near the poles.
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