# Create a CEA map from a full disk HMI magnetogram

**URL:** <https://community.openastronomy.org/t/create-a-cea-map-from-a-full-disk-hmi-magnetogram/1440>\
**Category:** SunPy\
**Tags:** sunpy, question\
**Created:** [July 29, 2026, 7:41pm UTC](https://community.openastronomy.org/t/create-a-cea-map-from-a-full-disk-hmi-magnetogram/1440 "2026-07-29T19:41:01Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![sdas](https://avatars.discourse-cdn.com/v4/letter/s/bc79bd/32.png) [@sdas](https://community.openastronomy.org/u/sdas)\
**Post date:** [July 29, 2026, 7:41pm UTC](https://community.openastronomy.org/t/create-a-cea-map-from-a-full-disk-hmi-magnetogram/1440/1 "2026-07-29T19:41:01Z")

</div>

I am looking to make a CEA map of a full-disk magnetogram from HMI but I cannot figure out how to do it with sunpy. I think there was an old tutorial in the example gallery but I cannot find that either. I already have the magnetogram downloaded and saved as a .fits file, and the header is completed with jsoc keywords but I am not sure what to do after. Thanks in advance for the help!

---

<div class="post-metadata">

**Author:** ![ayshih](https://dub1.discourse-cdn.com/flex005/user_avatar/community.openastronomy.org/ayshih/32/84_2.png) [@ayshih](https://community.openastronomy.org/u/ayshih)\
**Post date:** [July 29, 2026, 9:20pm UTC](https://community.openastronomy.org/t/create-a-cea-map-from-a-full-disk-hmi-magnetogram/1440/2 "2026-07-29T21:20:48Z")

</div>

You can adapt this example: [Creating Carrington Maps — sunpy 8.0.0 documentation](https://docs.sunpy.org/en/stable/generated/gallery/map_transformations/reprojection_carrington.html)

To get the CEA projection, pass `projection_code="CEA"` when calling `make_heliographic_header()`.