Polar grid on a flat surface

[fernandorannou]

Requirements

• Reviewed ESMF Reference Manual
• Searched GitHub Discussions

Affiliation(s)

Universidad de Santiago de Chile

ESMF Version

esmpy

Issue

Hello,
I'm working on regridding a 2D rectilinear data (log constant in x and y) onto a 2D flat polar grid (log also on r and theta). The documentation says that the polar grid is on a perfect sphere, so I assume I must use a mesh instead of a grid for the destination field, and set to esmpy.MeshElemType.QUAD for elemType (?)

Can I use a esmpy.CoordSys.CART grid for the source field and a mesh for the destination field?
Thanks

Fer

Autotag

@oehmke

[oehmke]

Hi Fer, You can use an ESMF Grid for the source and a Mesh for the destination. However, the decision about whether to use a Grid or a Mesh is based more on the topology or connections of the geometry and not the coordinates. A Grid only handles logically rectangular (or set of tiles of logically rectangular) geometries. Whereas a Mesh is much more general than that. (What the documentation you refer to means is that when ESMF Grids, Meshes, etc. use spherical coordinates, then they are represented as a perfect sphere within the regrid calculations.) If you have a source and destination that are not spherical coordinates, then you can use esmpy.CoordSys.CART. However, the important thing is that the coordinates are consistent between the two. E.g. If you have a source point and a destination point with the same coordinates, then they should be in the same location. Does that make sense? Let me know if you have more questions. Thanks, - Bob

…

On Jun 28, 2024, at 8:54 AM, fernandorannou ***@***.***> wrote: Requirements Reviewed ESMF Reference Manual <https://earthsystemmodeling.org/doc/> Searched GitHub Discussions <https://github.com/orgs/esmf-org/discussions?discussions_q=> Affiliation(s) Universidad de Santiago de Chile ESMF Version esmpy Issue Hello, I'm working on regridding a 2D rectilinear data (log constant in x and y) onto a 2D flat polar grid (log also on r and theta). The documentation says that the polar grid is on a perfect sphere, so I assume I must use a mesh instead of a grid for the destination field, and set to esmpy.MeshElemType.QUAD for elemType (?) Can I use a esmpy.CoordSys.CART grid for the source field and a mesh for the destination field? Thanks Fer Autotag @oehmke <https://github.com/oehmke> — Reply to this email directly, view it on GitHub <#258>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AE6A7U4MBLNNLA77UEMYFZDZJV2MDAVCNFSM6AAAAABKCBXSYGVHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZWHA3TGOBZGM>. You are receiving this because you were mentioned.

[fernandorannou]

Ok, I'll give it a try. Thanks a lot.