METplus PointStat configuration for JASON3 satellite

[sbanihash]

Hi everyone,

I have been trying to look into the configurations for the global_det wave stat grid2obs job and it has come to my attention that in the PointStat_fcstGLOBAL_DET_obsJASON3_climoERA5_Wave_Multifield.conf file, the configuration for POINT_STAT_INTERP_TYPE_METHOD is written twice and probably the second mention overwrites the first one.

https://github.com/NOAA-EMC/EVS/blob/d2cfb977455276407ea4bd4319fb3a950d6333ae/parm/metplus_config/stats/global_det/wave_grid2obs/PointStat_fcstGLOBAL_DET_obsJASON3_climoERA5_Wave_Multifield.conf#L85C1-L99C33

IfI understand correct, this means the INTERP_TYPE_METHOD will be NEAREST and given that POINT_STAT_INTERP_TYPE_WIDTH = 1 , the closest grid point to the obs point is chosen for calculating stats.

Can someone confirm that I am understanding this correct and explain why this method is chosen over the BILIN method which combined with the POINT_STAT_INTERP_TYPE_WIDTH = 2, will find the 2x2 (4 points) nearest grid and average them.

Thanks in advance for your help.

@AliciaBentley-NOAA @QiShi-NOAA

[BinbinZhou-NOAA]

Saeideh, Yes, your understanding for NEARST is correct, in which no interpolation is involved. So the width is set to 1 (default setting for NEAREST). For BILIN, yes, 2x2=4 nearest points are required. In BILIN setting, 2 points in one direction are first used to linearly interpolation, and then other 2 points in another direction are used to linearly interpolation. This is why this method is called bi-linear interpolation. Binbin

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On Wed, Apr 9, 2025 at 10:16 PM Saeideh Banihashemi < ***@***.***> wrote: Hi everyone, I have been trying to look into the configurations for the global_det wave stat grid2obs job and it has come to my attention that in the PointStat_fcstGLOBAL_DET_obsJASON3_climoERA5_Wave_Multifield.conf file, the configuration for POINT_STAT_INTERP_TYPE_METHOD is written twice and probably the second mention overwrites the first one. https://github.com/NOAA-EMC/EVS/blob/d2cfb977455276407ea4bd4319fb3a950d6333ae/parm/metplus_config/stats/global_det/wave_grid2obs/PointStat_fcstGLOBAL_DET_obsJASON3_climoERA5_Wave_Multifield.conf#L85C1-L99C33 IfI understand correct, this means the INTERP_TYPE_METHOD will be NEAREST and given that POINT_STAT_INTERP_TYPE_WIDTH = 1 , the closest grid point to the obs point is chosen for calculating stats. Can someone confirm that I am understanding this correct and explain why this method is chosen over the BILIN method which combined with the POINT_STAT_INTERP_TYPE_WIDTH = 2, will find the 2x2 (4 points) nearest grid and average them. Thanks in advance for your help. @AliciaBentley-NOAA <https://github.com/AliciaBentley-NOAA> @QiShi-NOAA <https://github.com/QiShi-NOAA> — Reply to this email directly, view it on GitHub <#703>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQBMPFMDJ5KA2HBDDW2VRWD2YXH7LAVCNFSM6AAAAAB22M3EK6VHI2DSMVQWIX3LMV43ERDJONRXK43TNFXW4OZYGE4DKOBXHA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

-- Binbin Zhou Physical Scientist Lynker at NOAA/NWS/NCEP/EMC 5830 University Research Ct. College Park, MD 20740 ***@***.*** 301-683-3683

[sbanihash]

Thanks Binbin for confirming. I guess I was trying to understand why the NEAREST is chosen over BILIN in this specific job.