Size distortion

Africa actually has 14 times as much area as Greenland

Thematic mapping

In the wild

Web Mercator

• Mercator projection cropped to ~85°N to 85°S -> square, good for tiling
• Spherical and ellipsoidal mix of formulas

Theatrum Orbis Terrarum, 1572

Equal Earth Greenwich

EPSG:8857

Equal Earth Americas

EPSG:8858

Equal Earth Asia-Pacific

EPSG:8859

Equal Earth Florence

Florence Meridian 11E

Support

• PROJ -> GDAL, QGIS, R
• D3, Plotly
• proj4js

Tile grid

Scaled grid

MapLibre

https://equal.bbox.earth/maplibre/

Web Mercator grid

OpenLayers

https://equal.bbox.earth/ol-asia-pacific/

Equal Earth Asia-Pacific, Web Mercator grid

deck.gl

https://equal.bbox.earth/deckgl/

MapLibre map with deck.gl layer using Web Mercator tile grid.

Proposal: Combined projections

https://equal.bbox.earth/maplibre-eq2merc/

Equal Earth tiles at z0-z2 and Web Mercator tiles with z >= 3.

OSM basemap with combined projections

https://maps.bbox.earth/

MapLibre with Shortbread PMTiles.

Animated transition z2 -> z3

https://kvaleya.gitlab.io/maplibre/globe/globedemo.html

Dynamic center meridian

https://observablehq.com/d/ece4d307c72c1312

Reproject WGS-84-Tiles?

Coordinate transformation

Plugins for MapLibre, OpenLayers, etc. with coordinate transformation functions.

Adapted zoom functions between z < 3 and z >= 3.

Done for MapLibre: github.com/pka/maplibre-gl-equal-earth