Interrupted Goode homolosine projection: interactive map

Move countries across the map, switch on distortion layers, and see what the Interrupted Goode Homolosine projection changes.

Buy a coffee (opens in a new tab)

✈Great circle vs rhumb line: routes tool↗

Select map projection:

Country at the center

Find a country

This view keeps its special layout. Your selected country is remembered. Choose Equal Earth to place it at the center of a flat map.

Change the world's center ↗

What should stay continuous?

The seams are part of the map, not a rendering error.

Routes and dragging across seams are limited in this projection.

Add country to compare:

🔍

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. It is 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 ↗Equal-area, interrupted pseudocylindrical. The map is cut into lobes (six by default) with seams in the oceans, like a flattened orange peel.

Atlas of error · liveInterrupted Goode HomolosineClick or tap a country to add its outline

Loading the map…

Interrupted Goode homolosine projection at a glance

Distortion class: Equal-area
Graticule type: Interrupted pseudocylindrical
Creator: John Paul Goode
Year: 1923
Area: Preserved throughout the map
Shape: Distorted, but splitting the map into lobes limits continental deformation; the central meridians of the lobes and the equator are distortion-free
Distances: Partially preserved: true along every parallel between 40°44′ N and S and along the central meridians of the lobes
Angles and directions: Distorted (not conformal)

Add countries from the tools panel and drag them to other latitudes. The outline keeps its true shape and area on the globe, so any change in its size on the map shows this projection's distortion. Tissot's indicatrices and the area distortion map show the same effect across the whole world.

Full guide: Interrupted Goode homolosine projection →Quiz: name the projection →