Add "Equal Earth" projection

[mbloch]

I just released v0.17, which includes the the Equal Earth projection using the Proj.4 name "eqearth".

The mapshaper-proj source file is here

Original Java source file is here

(@berniejenny, I copied the comment block from your source code to comply with the Apache license that you're using, please let me know if there's a problem with the way I'm citing your work).

Link to journal article is here

+proj=eqearth is already available in Mapshaper, here is a screenshot comparing Equal Earth to Robinson:

[mbloch]

See also https://github.com/OSGeo/proj.4/issues/1085 and https://github.com/proj4js/proj4js/issues/295

[berniejenny]

Thanks, Matthew. This was quick!

[ahocevar]

@mbloch @berniejenny Is it ok if I take https://github.com/mbloch/mapshaper-proj/blob/master/src/projections/eqearth.js as base implementation for use in https://github.com/proj4js/proj4js? There won't be many changes.

[mbloch]

Fine with me!

[berniejenny]

Fine with me!

On 23 Mar 2024, at 5:01 AM, Andreas Hocevar @.***> wrote:

@mbloch https://github.com/mbloch @berniejenny https://github.com/berniejenny Is it ok if I take https://github.com/mbloch/mapshaper-proj/blob/master/src/projections/eqearth.js as base implementation for use in https://github.com/proj4js/proj4js? There won't be many changes.

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