can anyone provide an example of spherical harmonics complex packing?

[edwardhartnett]

Can anyone provide a small, but working, example of the settings needed for spherical harmonics complex packing? Is anyone we know using this?

I am trying to write a test for specpack()/specunpack(), but I don't understand how this packing works - it's quite beyond the sort of math I'm used to. I'm sure I can understand it eventually, but it sure would be helpful if someone who knows it could give me a working example...

See: https://www.nco.ncep.noaa.gov/pmb/docs/grib2/grib2_doc/grib2_temp5-51.shtml

I've got the test I'm trying up here: #188

Currently the code (and test) report success, but the data I get out of specunpack does not match the data I put into specpack. Which is sad.

[BoiVuong-NOAA]

No, I do not know spherical harmonics complex packing. I do not know any GRIB2 in PROD that uses spherical harmonics complex packing.

[Hang-Lei-NOAA]

When I was developing the interoperable physics driver, I remembered that the stochastic physics used it in some way. Let me search it.

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On Thu, Nov 4, 2021 at 7:42 AM Boi Vuong ***@***.***> wrote: No, I do not know spherical harmonics complex packing. I do not know any GRIB2 in PROD that uses spherical harmonics complex packing. — You are receiving this because you were assigned. Reply to this email directly, view it on GitHub <#189 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AKWSMFHWTY5HPGCNUTTFKL3UKJ5SFANCNFSM5HLEFG2A> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[Hang-Lei-NOAA]

You can get some reference from here: git clone https://github.com/noaa-psd/stochastic_physics.git stochy_internal_state_mod.F90 contains the spherical harmonic definitions and arrays stochy_patterngenerator.F90; spectral_transforms.F90; get_stochy_pattern.F90; get_stochy_pattern.F90 initial, convert it. On Thu, Nov 4, 2021 at 8:53 AM Hang Lei - NOAA Affiliate ***@***.***> wrote:

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When I was developing the interoperable physics driver, I remembered that the stochastic physics used it in some way. Let me search it. On Thu, Nov 4, 2021 at 7:42 AM Boi Vuong ***@***.***> wrote: > No, I do not know spherical harmonics complex packing. I do not know any > GRIB2 in PROD that uses spherical harmonics complex packing. > > — > You are receiving this because you were assigned. > Reply to this email directly, view it on GitHub > <#189 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AKWSMFHWTY5HPGCNUTTFKL3UKJ5SFANCNFSM5HLEFG2A> > . > Triage notifications on the go with GitHub Mobile for iOS > <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> > or Android > <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. > >

[edwardhartnett]

@Hang-Lei-NOAA can you try to turn this into a test? I can help if you need it...

[Hang-Lei-NOAA]

@edward Hartnett - NOAA Affiliate ***@***.***> Okay, let me explore it this summer, besides the library work for models.

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On Mon, Jun 17, 2024 at 3:17 AM Edward Hartnett ***@***.***> wrote: @Hang-Lei-NOAA <https://github.com/Hang-Lei-NOAA> can you try to turn this into a test? I can help if you need it... — Reply to this email directly, view it on GitHub <#189 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AKWSMFGWVAB7CFIBOFQBNGTZH2EO3AVCNFSM6AAAAABJNNJGH6VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNZSGQ3TINRQGE> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[edwardhartnett]

OK, this got dropped, but @Hang-Lei-NOAA if you can obtain a file which uses this packing, we can turn it into a test. But we need a data file...