[ncl-talk] Question about PopLatLon: reamp regular lat-lon grid to POP grid

[Dennis Shea]

ftp ftp,cgd.ucar.edu
anonymous
cd pub/shea
get  map_gx1v3_to_1x1d_bilin_da_010808.nc.gz
quit


to ecompress:

%> gzip -d map_gx1v3_to_1x1d_bilin_da_010808.nc.gz

Good Luck

On Wed, Jun 17, 2020 at 6:47 PM Dave Allured - NOAA Affiliate via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> It looks like this data set uses a special code value over land, and that
> is distorting adjacent grid points through PopLatLon.  Examine the input
> file, find out what the special code is, and set those values to the data
> set missing value (x at _FillValue) in NCL memory, before calling PopLatLon.
>
> I can not answer your second question about a file location.  You will not
> need that other file if you can solve the special code problem above.
>
>
> On Wed, Jun 17, 2020 at 4:50 PM Yuntao BAO via ncl-talk <
> ncl-talk at mailman.ucar.edu> wrote:
>
>> Dear NCL-talk,
>>
>> I use PopLatLon function to remap SST with a regular 1x1 lat/lon grid to
>> a POP grid. To perform the remapping, I use the POP weight file "*map_1x1d_to_gx1v6_bilin_da_100716.nc
>> <http://map_1x1d_to_gx1v6_bilin_da_100716.nc>" downloaded from *
>>
>> https://svn-ccsm-inputdata.cgd.ucar.edu/trunk/ncl/
>>
>>
>>
>>
>>
>> I successfully get the result, the new SST with a gx1v6 POP grid. But the
>> problem is that* the new SST data has many unrealistic values in most of
>> the continental margin (shown in Fig. b), these values are much less than
>> it should be. *
>>
>> I don't know what may cause this problem. Do you have any idea about what
>> may cause this problem? I think maybe the POP weight file accounts.
>>
>>
>>
>> The remapping results of the example *lat2pop_1.ncl *on NCL webpage has
>> no such problem. This example used a different POP weight file *"map_1x1d_to_gx1v3_bilin_da_010808.nc
>> <http://map_1x1d_to_gx1v3_bilin_da_010808.nc>". I tried to download this
>> weight file, but I can't find it anywhere. Could you please guide me to the
>> location of this former POP weight
>> file "map_1x1d_to_gx1v3_bilin_da_010808.nc
>> <http://map_1x1d_to_gx1v3_bilin_da_010808.nc>" ?*
>>
>>
>>
>> I would appreciate if you can help! Looking forward to your reply!
>>
>> Best regards,
>>
>> *Yuntao Bao*
>>
>>
>> *Appendix:*
>>
>> *This is the link of the example lat2pop_1.ncl:*
>>
>> https://www.ncl.ucar.edu/Applications/Scripts/lat2pop_1.ncl
>>
>>
>>
>> *These are the plots before and after remapping:*
>>
>> <snip>
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