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Map toolsCountries, projection, and layers

Projection lab · live

Sao Tome and Principe at the center of the world map

The same planet, a different viewpoint. Place any country at the center of a flat map and see the familiar continents arranged anew.

✈Great circle vs rhumb line — routes tool↗

Projection

Country at the center

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Sao Tome and PrincipeSTP

Find a country

Centering modeExactly at the centerOn the central meridian

We rotate geographic coordinates before flattening them. Geographic north does not point up everywhere on the screen.

Equal Earth preserves relative areas after rotation too. Shapes and directions can change.

Why does a world map centered on Australia look so different? ↗

What does the center point mean?

We choose a point on the country's main land component using Natural Earth data at 1:50 million scale. For Tuvalu we use the approximate location of Funafuti. This is a view anchor, not an official geographic center. Small islands may have no visible outline on the simplified map, but their marker still shows their location.

Add country to compare:

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Quick start

Add a country, then drag its outline anywhere on the map.

Map appearance

Change the background and contrast of every layer.

Map layersProjection diagnostics

Tissot's indicatrices

Equal-sized circles on the globe. Their distortion on the map instantly reveals how the projection alters area and shape.

Area-distortion heatmap

A continuous gradient across the whole map: the redder an area, the more the projection inflates its size relative to reality.

Area isocolesA

Lines joining places with the same relative area inflation. They work like contour lines on a topographic map of error.

Angular isocolesω

Lines of equal maximum angular deformation. On conformal projections such as Mercator, this layer remains empty.

True-north field↑N

Arrows show where geographic north lies on the screen. Their rotation reveals how a projection alters directions.

Geographic context

Equator, tropics & polar circles

Five major parallels anchor Earth's zones and reveal how the projection stretches high latitudes.

Ocean currents

An animated, simplified view of major surface currents — especially revealing on ocean-centred projections.

Day & night

Draws the day/night boundary (terminator) — a great circle that every projection bends differently. Drag the slider to change the time.

Antipodes

Overlays each selected country's outline at its antipode (the opposite side of the globe). Unavailable on the globe view.

Field guide to map errorHow do I read these layers? →

Projection Details ↗The Equal Earth projection preserves area proportions while maintaining an aesthetic continental shape, a modern alternative to Gall-Peters.

Sao Tome and PrincipeEqual EarthClick or tap a country to place it at the center

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RealSize.World

Discover the true size of countries and continents, free from Mercator projection distortions.

contact [at] realsize.world

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Mercator Projection
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An educational project. Geographic data is for illustrative purposes.