Adding Interrupted Quartic Authalic Projection

d3 / d3-geo-projection

Extended geographic projections for d3-geo.

https://observablehq.com/collection/@d3/d3-geo-projection

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Adding Interrupted Quartic Authalic Projection #170

Closed piwodlaiwo closed 5 years ago

piwodlaiwo commented 5 years ago

It would be great if we could add this to d3-geo-projection

piwodlaiwo commented 5 years ago

Karl Siemon’s Quartic Authalic projection is well known but the interrupted version is quite rare. I really like it visually but it also comes with some distortion benefits, as I think the interrupted form helps reduce distortions near outer meridians at high latitudes.

I compressed the image but having a hard time figuring how to squash/combine the commits in the branch.

Fil commented 5 years ago

I've merged it, then added a few fixes (commit log in https://github.com/d3/d3-geo-projection/commit/e944102be7f7f8a0554cc34b7ba0c9e20138cc9e ; scale and test image in https://github.com/d3/d3-geo-projection/commit/1b5a51c0f68d434bd3520afe978af7788ac58827). Thank you!