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Add cylindrical equal-area projection (epsg 6933) support #1098

@mjbrodzik

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@mjbrodzik

Description

I am a producer of data using the EASE-Grid 2.0 reference, which includes 3 projections. It looks to me like cartopy supports two of them: Northern and Southern Lambert Equal-Area Azimuthal, but not the third, cylindrical equal-area. Can you add support for this last projection?

Publication with reference coordinate transforms is:
http://www.mdpi.com/2220-9964/1/1/32

and some technical corrections that pertain to the cylindrical projection here:
http://www.mdpi.com/2220-9964/3/3/1154

The projection I am looking for is defined in EPSG as Projected CRS 6933.

I would be happy to answer any other questions. It would be great to tell users of the EASE-Grid 2.0 data sets that all 3 projections are supported by cartopy.

Thank you for your work on this project.

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