Re: ESMF gen weights problem

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.

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?).

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".

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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