# Spilhaus projection!

**URL:** <https://forum.generic-mapping-tools.org/t/spilhaus-projection/4999>\
**Category:** Q&A\
**Tags:** gmt\
**Created:** [June 19, 2024, 1:53pm UTC](https://forum.generic-mapping-tools.org/t/spilhaus-projection/4999 "2024-06-19T13:53:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ghomsi123](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/ghomsi123/32/79_2.png) [@ghomsi123](https://forum.generic-mapping-tools.org/u/ghomsi123)\
**Post date:** [June 19, 2024, 1:53pm UTC](https://forum.generic-mapping-tools.org/t/spilhaus-projection/4999/1 "2024-06-19T13:53:10Z")

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Hi Geek Masters,  
I’m wondering if anyone knows how to reproduce the Quasi-Spilhaus square projection on GMT?  
Any help would be appreciated.

 ![Spilhaus_projection](https://canada1.discourse-cdn.com/flex047/uploads/gmt/original/2X/c/ca8cf33fde9ec400dd821764d183c0c54e3a8504.jpeg)

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**Author:** ![Andreas](https://avatars.discourse-cdn.com/v4/letter/a/ee7513/32.png) [@Andreas](https://forum.generic-mapping-tools.org/u/Andreas)\
**Post date:** [June 19, 2024, 4:36pm UTC](https://forum.generic-mapping-tools.org/t/spilhaus-projection/4999/2 "2024-06-19T16:36:46Z")

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Not implemented in gmt, and can’t find it in proj either.

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**Author:** ![Joaquim](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/joaquim/32/16_2.png) [@Joaquim](https://forum.generic-mapping-tools.org/u/Joaquim)\
**Post date:** [June 19, 2024, 5:03pm UTC](https://forum.generic-mapping-tools.org/t/spilhaus-projection/4999/3 "2024-06-19T17:03:57Z")

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Unfortunately, the Spilhaus [issue](https://github.com/OSGeo/PROJ/issues/1851) in PROJ is stalled for a long. We were waiting for it.

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**Author:** ![andrebelem](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/andrebelem/32/1218_2.png) [@andrebelem](https://forum.generic-mapping-tools.org/u/andrebelem)\
**Post date:** [June 20, 2024, 2:26pm UTC](https://forum.generic-mapping-tools.org/t/spilhaus-projection/4999/4 "2024-06-20T14:26:27Z")

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@ghomsi123 you can try it: [Spillhaus Projection Experiment (PyGMT + COLAB)](https://github.com/andrebelem/pythonverse/blob/main/Spillhaus_projection_experiment_%5BPyGMT%2BCOLAB%5D.ipynb).

It still needs some improvements, but “this is the way.”

Cheers