[ncl-talk] ESMF regridding

[Rashed Mahmood]

Hi Chatu,

ESMF regridding works fine for 3 dimensional data. What makes you think it
does not?

Likely you would need to attach the 2d coordinate arrays with the
variables, e.g.:

varb1 at lat2d  = infile1->latitude
varb1 at lon2d = infile1->longitude

varb2 at lat2d  = infile2->latitude
varb2 at lon2d = infile2->longitude

If this does not work, then share a full script (and any error messages you
get).

HTH
Rashed




On Wed, Mar 24, 2021 at 4:28 PM Chathurika via ncl-talk <
ncl-talk at mailman.ucar.edu> wrote:

> Dear All,
>
>
> Thank you so much for reading my email and helping me out to solve this
> issue.
>
>
> I want to perform the significance test (ttest) over time dimension for
> the differences of two datasets which have lat[:,:] and lon[:,:] (two
> dimensional, like WRF).
>
>
>  differences = (high resolution - low resolution).
>
>
> However, the dimensions of lat and lon are not same. The variable summary
> is;
>
>
> Low resolution:
>
> Type: float
>
> Total Size: 54067200 bytes
>
>             13516800 values
>
> Number of Dimensions: 3
>
> Dimensions and sizes: [time | 240] x [j | 220] x [i | 256]
>
> Coordinates:
>
>             time: [52975.5..60249.5]
>
>             j: [0..219]
>
>             i: [0..255]
>
> Number Of Attributes: 11
>
>   standard_name : sea_surface_height_above_geoid
>
>   long_name : Sea Surface Height Above Geoid
>
>   comment : This is the dynamic sea level, so should have zero global
> area mean. It should not include inverse barometer depressions from sea ice.
>
>   units : m
>
>   original_name : zos
>
>   cell_methods : area: mean where sea time: mean
>
>   cell_measures : area: areacello
>
>   history : 2019-09-04T15:31:31Z altered by CMOR: replaced missing value
> flag (-9e+33) and corresponding data with standard missing value (1e+20).
>
>   missing_value : 1e+20
>
>   _FillValue : 1e+20
>
>   coordinates : latitude longitude
>
> High resolution:
>
>
> Type: float
>
> Total Size: 311047680 bytes
>
>             77761920 values
>
> Number of Dimensions: 3
>
> Dimensions and sizes: [time | 240] x [j | 404] x [i | 802]
>
> Coordinates:
>
>             time: [52975.5..60249.5]
>
>             j: [0..403]
>
>             i: [0..801]
>
> Number Of Attributes: 11
>
>   standard_name : sea_surface_height_above_geoid
>
>   long_name : Sea Surface Height Above Geoid
>
>   comment : This is the dynamic sea level, so should have zero global
> area mean. It should not include inverse barometer depressions from sea ice.
>
>   units : m
>
>   original_name : zos
>
>   cell_methods : area: mean where sea time: mean
>
>   cell_measures : area: areacello
>
>   history : 2019-08-25T07:38:10Z altered by CMOR: replaced missing value
> flag (-9e+33) and corresponding data with standard missing value (1e+20).
>
>   missing_value : 1e+20
>
>   _FillValue : 1e+20
>
>   coordinates : latitude longitude
>
>
> *latitude and longitude have two dimensions.
>
>
> I cannot do ESMF regridding as per it is not allowed to use the all three
> dimensions (time, lat, lon). I am little confused here, How can I use ESMF
> regridding and keep the time dimension also. If so, after regridding, I can
> perform the ttest for the resolution difference.
>
>
> Please help me and Many many thanks.
>
>
> Best regards,
>
> Chathu
>
> ------------------------------
>
>
>
> Wickramage Chathurika Hemamali
> Msc in Physical Oceanography
> State Key Laboratory of Tropical Oceanography
> South China Sea Institute of Oceanology
> University of Chinese Academy of Science
> China
>
> *Specialized in Oceanography and Marine Geology (Bachelor)*
> *University of Ruhuna*
> *Matara*
> *Sri Lanka*
>
> Email : wickramagechathurika at rocketmail.com
> chatu at scsio.ac.cn
>
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