[ferret_users] Regridding transformation

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Subject: [ferret_users] Regridding transformation

From: "JoshAB1995@xxxxxxxxxxx" <JoshAB1995@xxxxxxxxxxx>

Date: Mon, 15 Apr 2019 09:23:00 +0000

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Thread-topic: Regridding transformation

Hi guys,

I’m currently trying to regrid my observational data onto my more coarse resolution model output data. However, I’m running into a few issues after entering the following code...

yes? use "./200517obs_temp.nc" !observation data

yes? use "./ocn_tempyearmean.nc" !model output data

yes? let regrid = T_AN[d=1,gxyzt = GOY1[d=2]@ASN] !I added @ASN as I was directed by Ferret to this transformation, T_AN is the observ variable, GOY1 is the grid from my model output.

yes? shade regrid[k=1]

**ERROR: unknown defining grid: GXYZT = GOY1[D=2]@ASN

This was after trying to do it all in Ferret.

I then tried to remap partially in cdo and carry out the remaining transformations in ferret via:

cdo remapbil,ocn_tempyearmean.nc 200517obs_temp.nc horizontalregrid.nc

The function for vertical regridding in cdo wasn’t working so I then moved back onto ferret:

yes? use “./horizontalregrid.nc” !horizontally regridded observations

yes? use “./ocn_tempyearmean.nc” !model output data

yes? let 3dregrid = T_AN[d=1, gzt = GOY1[d=2]] ! regrids the vertical axis with no issues but struggles with the taxis, so then added the @ASN and it still ran into issues with the t transformation.

Just to make sure it’s not the ‘grid’ that’s messing it up I also reran the code but instead of GOY1 entered the name of the model output data variable “ocn_temp” – to no avail...

This is the first time I’ve tried to interpolate two grids and so I’m sure there are simple errors I’m making but I’m struggling to figure out where... Any help would be greatly appreciated.

Many thanks,

Josh

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