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JiaweiZhuang / xESMF

Universal Regridder for Geospatial Data
http://xesmf.readthedocs.io/
MIT License
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Setting the coordinate system in xESMF #39

Open ChristianSteger opened 5 years ago

ChristianSteger commented 5 years ago

Hi Jiawei,

First of all, thank a lot for developing and maintaining this great package. I was was wondering if it is possible to switch between planar and spherical coordinates in xESMF. I guess it is important how the coordinates are interpreted (as planar or spherical) when e.g. area-weights are computed for the conservative regridding. It seems possible to set this in ESMPy (see: http://www.earthsystemmodeling.org/esmf_releases/last_built/esmpy_doc/html/CoordSys.html#ESMF.api.constants.CoordSys.SPH_DEG). Is this feature also available in xESMF (and if so, how?)?

Cheers & thanks, Christian

JiaweiZhuang commented 5 years ago

You are right that ESMF can deal with both spherical and cartesian coordinates. But I only specify spherical coordinate in xESMF code. I rarely use the cartesian one but I guess it should also work. You may install from source code, change that line of code to coord_sys=ESMF.CoordSys.CART, and then xESMF should interpret the 'lon' coordinate as 'x' in cartesian plane.

I am curious what's the use case of this? Are you dealing with non-geospatial data?