Re: Regriddin DAYMET data (generated using contributed NCL script) into WRF Grid

From: Dave Allured - NOAA Affiliate <dave.allured_at_nyahnyahspammersnyahnyah>
Date: Thu Feb 14 2013 - 15:35:02 MST


Daymet files are relatively ordinary Netcdf files with curvilinear
grids, two-dimensional geographic coordinates, and partial areas with
all missing values. They conform to standard CF conventions for 2-D
coordinates and most other metadada. This is true for original Daymet
"tiles" as well as merged files made by the Daymet join script.

Just treat these files the same way as many other data sets with 2-D
coordinates to be found across various NCL examples.

I do not have enough experience with regridding to make comparisons
between the various NCL regridding methods.

Kamal, the script that Mary drafted looks fine to me. The same goes
for examples 2 and 3 on the NCL Daymet applications page. They all
use the same ESMF regridding function, so they should be equivalent.
Also, I suspect that NCL has other regridding functions that work well
with 2-D coordinates. So please study the regridding applications
page if you would like more alternatives.


On Thu, Feb 14, 2013 at 1:29 PM, Mary Haley <> wrote:
> Kamal,
> I don't know anything about DAYMET files, so I can't answer about their differences.
> Dave Allured might have some ideas there.
> Meanwhile, the ESMF WRF-to-curvilinear script is mostly a convenience
> script that is tailored for WRF data. Really, it's just a curvilinear-to-curvilinear script.
> The script you have can easily be modifed to go from curvilinear to WRF.
> I've attached a sample script that likely has some errors in it, since I haven't tried it!
> --Mary
> On Feb 12, 2013, at 9:57 PM, wrote:
>> Hi,
>> I want to re-grid the DAYMET data prepared using Dave's contributed
>> NCL script
>> (
>> into WRF model grid. I can see that both data set is on curvilinear
>> grid. It is stated in the "ESMF_WRF_to_curv.ncl" script's header file
>> that "This is an NCL/ESMF template file for regridding from a WRF
>> (curvilinear) grid to a different curvilinear grid". So, I want to
>> know is there any difference between the DAYMET data prepared using
>> Dave's contributed NCL script and WRF model output?
>> I want to compare my WRF model output (dx=dy=8km) with the 1 km DAYMET
>> data set. So, could you please tell me which NCL regridding script I
>> should use?
>> Thanks
>> Kamal
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Received on Thu Feb 14 15:35:14 2013

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