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Are vector spherical harmonic transforms available? #153
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FYI It's probably not so clear but the first place to look is at the docs for the C library: https://mikaelslevinsky.github.io/FastTransforms/ Though it also doesn't say much about VSH so best to wait for @MikaelSlevinsky to respond... |
Hi @ajdawson! There are at least three ways to work with vector fields here: using the Probably the most efficient are the As a general rule, this library is slower and more accurate than SHTns (except for spherical rotations where I'm told our pre-paper algorithm is supposedly the best available). |
I have a beginner question: I would like to compute some vector spherical harmonic transforms, specifically I want to be able to compute vorticity and divergence from eastward and northward vector components, and also the reverse. I am new to Julia, but in Python I have been using shtns and there I would use their 2-argument forms of SH analysis and synthesis with some scaling (just like the getuv and getvrtdiv methods in their shallow_water.py example).
I am having trouble understanding how (or if) this is possible in FastTransforms.jl, can you offer any advice? I've seen the plan_sphv* functions but I am not well enough versed in the topic to understand what these do (i.e. they operate on a single field, not a pair). Thanks!
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