Re: ESMF gen weights problem

One last related question: is there any way to *not* have
ESMF_regrid_gen_weights create the PET*Log file? It's not using much
space but it is something I don't normally need and adds to file
clutter. I didn't see anything in the available Opt attributes and I
have Debug turned off.

Thanks,
Dave

Mary Haley said the following on 11/13/12 2:59 PM:
> On Nov 13, 2012, at 2:34 PM, David B. Reusch wrote:
>
>> Yes, that was it. Sigh. Thanks so much for the sharper eyes! With the
>> power outage disruptions yesterday, I wasn't exactly at my best. Why I
>> didn't catch it today though...who knows. Still, happier to have it be
>> a mistake here then a nasty bug there.
> Yeah, me too! :-)
>
>> There is still the question of ESMF_regrid_gen_weights saying everything
>> is ok when it's not (i.e., n_s should *not* ever be zero, right?).
> I would think so. I'll ask the ESMF folks about this. I've also created a ticket
> to add a check in our ESMF_regrid_xxx code for this.
>
>
>> And I also came across a super-minor type when poking around for this
>> yesterday: at line 2063 in ESMF_regridding.ncl it says
>> "ESMF_RegridGenWeight" when I think it should be "ESMF_RegridWeightGen".
> Noted and corrected, thanks..
>
> --Mary
>
>> Thanks,
>> Dave
>>
>> Mary Haley said the following on 11/13/12 2:23 PM:
>>> I think the problem is with this line:
>>>
>>> lon2d_sub = lat2d_d(::2,::2)
>>>
>>> The variable on the right side should be "lon2d_d".
>>>
>>> Can you let me know if this fixes the issue on your end?
>>>
>>> --Mary
>>>
>>> On Nov 13, 2012, at 2:00 PM, David B. Reusch wrote:
>>>
>>>> Hello,
>>>>
>>>> I'm having a problem with ESMF regridding where ESMF_regrid_gen_weights appears to succeed but the var n_s = 0 and thus row, col and S are all empty. Not surprisingly, this leads to a segfault if I try to do a regrid_with_weights with this file. The weird part is that the target grid will work when going from one source grid but not another, as explained below.
>>>>
>>>> I have two potential input files/source grids:
>>>> (1) an unmodified WRF file (technically it's been postprocessed but I haven't done any spatial subsetting yet). This grid is 357 x 381.
>>>> (2) a spatial subset of (1) created by selecting points in the original file that lie within particular lat/lon boundaries (the "subdomain" file). This grid is 119 x 167.
>>>>
>>>> I have two potential target grids:
>>>> (3) every other point from (1), 179 x 191.
>>>> (4) every other point from (2), 60 x 84.
>>>>
>>>> Case 1. Input grid is lat/lon from (1) , output grid is (3). Result: OK
>>>> Case 2. Input grid is lat/lon from (1) , output grid is (4). Result: OK
>>>> Case 3. Input grid is lat/lon from (2) , output grid is (4). Result: n_s = 0, segfault on regrid.
>>>>
>>>> The clues so far point to a problem with relating source grid (2) to target grid (4), but this target grid does actually work with source grid (1).
>>>>
>>>> There are no messages in the PET0* log file and no obvious debug output suggesting errors.
>>>>
>>>> This is NCL 6.1 on OS X 10.8.2. I've put the script, input WRF files and ESMF files in file ESMF_Problem_Reusch.zip in the incoming directory at ftp.cgd.ucar.edu. For the ESMF files, prefix "Dmn" indicates case 3, prefix "Full" = case 2. Likewise, the WRF files have suffix "domain" and "full".
>>>>
>>>> Thanks,
>>>> Dave
>>>> --
>>>> Associate Research Professor of Climatology
>>>> Dept of Earth and Environmental Science
>>>> MSEC 304; 801 Leroy Place
>>>> New Mexico Tech
>>>> Socorro, NM 87801
>>>>
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>> --
>> Associate Research Professor of Climatology
>> Dept of Earth and Environmental Science
>> MSEC 304; 801 Leroy Place
>> New Mexico Tech
>> Socorro, NM 87801
>>
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>

-- 
Associate Research Professor of Climatology
Dept of Earth and Environmental Science
MSEC 304; 801 Leroy Place
New Mexico Tech
Socorro, NM 87801
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