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evansiroky / timezone-boundary-builder

A tool to extract data from Open Street Map (OSM) to build the boundaries of the world's timezones.
MIT License
860 stars 82 forks source link

Map only needs 4 colours. #116

Closed jmesich closed 2 years ago

jmesich commented 2 years ago

Remake the map with 4 colours: https://en.wikipedia.org/wiki/Four_color_theorem

empjustine commented 2 years ago

As the linked page says:

The intuitive statement of the four color theorem – "given any separation of a plane into contiguous regions, the regions can be colored using at most four colors so that no two adjacent regions have the same color" – needs to be interpreted appropriately to be correct. (...) If we required the entire territory of a country to receive the same color, then four colors are not always sufficient.

If we required the entire territory of a [non-contiguous] timezone to receive the same color, then four colors are not always sufficient.

evansiroky commented 2 years ago

I can see this being confusing for some timezones that touch many more than 4 other timezones. Also, the way the colors are generated is using QGIS to classify each boundary as a different color which is fairly low effort. In the end, the map in the README isn't really the important part of a release. Therefore, I'm closing this as "will not fix".