The web mercator based split map to compare countries or places in the world can be grossly inaccurate as much of the world do not lie along the equator. While researching another project I found Cesium which renders the globe accurately in 3d, so I made a new version using Cesium.

This version also adds the ability to overlay the two maps to make more direct comparisons, albeit comparisons can hard if no strong lines or colours are present for the terrain features being compared.

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