[ncl-talk] ESMF regridding
Chathurika
chatu at scsio.ac.cn
Thu Mar 25 13:23:22 MDT 2021
Dear Dennis,
I have shared the files in the google drive. Hope you did notice it.
Thank you so much and best regards,
Chathu
-----Original Messages-----
From:"Dennis Shea" <shea at ucar.edu>
Sent Time:2021-03-26 00:03:34 (Friday)
To: Chathurika <chatu at scsio.ac.cn>
Cc: ncl-talk <ncl-talk at mailman.ucar.edu>
Subject: Re: Re: [ncl-talk] ESMF regridding
For sure, you should not "reorder the dimensions"
Could you ftp two sample files? dropbox?
ftp ftp.cgd.ucar.edu
anonymous
your_email
cd incoming
put zos.....nc
put zos...nc
quit
You can notify me directly after successful file transmission.
On Thu, Mar 25, 2021 at 1:53 AM Chathurika <chatu at scsio.ac.cn> wrote:
Dear Dennis,
Many many thanks for your reply. Can we keep the time step in the following ESMF functions? Because I get the 'error' which is
'fatal:Eq: Dimension size, for dimension number 0, of operands does not match, can't continue
fatal:["Execute.c":8637]:Execute: Error occurred at or near line 1623 in file $NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl'
The code which I used;
diri = "./"
fili = systemfunc("cd "+diri+" ; ls zos_*.nc")
nfili= dimsizes(fili)
print("nfili="+nfili)
f = addfiles(diri+fili,"r")
ListSetType (f, "cat")
print(str_join(getfilevarnames(f[0]),", "))
zos1= f[29:32]->zos(:,:,:)
printVarSummary(zos1)
time = f[29:32]->time(:)
T = cd_calendar(time, -1)
printVarSummary(T)
printMinMax(T, False)
;---Interpolation methods
;---Output (and input) files
srcGridName = "CMIP5_SCRIP.nc"
dstGridName = "World1deg_SCRIP.nc"
wgtFile = "CMIP5_2_World_bilinear.nc"
;---Get data and lat/lon grid from CMIP5 Grid
cmip5_lat2d = f[13]->latitude
cmip5_lon2d = f[13]->longitude
latlon_dims = dimsizes(cmip5_lon2d)
;----------------------------------------------------------------------
; Convert CMIP5 to SCRIP file.
;----------------------------------------------------------------------
Opt = True
Opt at Mask2D = where(.not.ismissing(zos1),1,0)
Opt at GridCornerLat = f[13]->vertices_latitude
Opt at GridCornerLon = f[13]->vertices_longitude
Opt at PrintTimings = True
Opt at ForceOverwrite = True
Opt at Debug = True
curvilinear_to_SCRIP(srcGridName,cmip5_lat2d,cmip5_lon2d,Opt)
;---Clean up
delete(Opt)
;----------------------------------------------------------------------
; Convert 1 degree world grid to SCRIP file
;----------------------------------------------------------------------
Opt = True
Opt at ForceOverwrite = True
Opt at LLCorner = (/-90.00d, -180.00d /)
Opt at URCorner = (/ 90.00d, 180.00d /)
;Opt at Title = "World Grid 1-degree Resolution"
Opt at PrintTimings = True
Opt at Debug = True
latlon_to_SCRIP(dstGridName,"1x1",Opt)
;---Clean up
delete(Opt)
;----------------------------------------------------------------------
; Loop across each method and generate interpolation weights for
; CMIP5 Grid to World Grid
;----------------------------------------------------------------------
Opt = True
Opt at ForceOverwrite = True
Opt at SrcESMF = False
Opt at DstESMF = False
Opt at InterpMethod = "bilinear"
Opt at PrintTimings = True
ESMF_regrid_gen_weights(srcGridName, dstGridName, wgtFile, Opt)
;---Clean up
delete(Opt)
;----------------------------------------------------------------------
; Interpolate data from CMIP5 to World 1-degree grid.
;----------------------------------------------------------------------
Opt = True
Opt at PrintTimings = True
Opt at Debug = True
zos1_regrid = ESMF_regrid_with_weights(zos1,wgtFile,Opt)
printVarSummary(var_regrid)
;----------------------------------------------------------------------
delete(Opt)
The script works fine when I input the time mean (zos(:,:)). I reorder the dimensions (zos(lat|:,lon|:,time|:). None of this works and I am not very good at this. So please help me.
Thank you very much and best regards,
Chathu
-----Original Messages-----
From:"Dennis Shea" <shea at ucar.edu>
Sent Time:2021-03-25 02:57:04 (Thursday)
To: Chathurika <chatu at scsio.ac.cn>
Cc: "Rashed Mahmood" <rashidcomsis at gmail.com>, ncl-talk <ncl-talk at mailman.ucar.edu>
Subject: Re: [ncl-talk] ESMF regridding
Let variable: R(time,latR,lonR)
If you input a variable with SOURCE dimensions HR(time, lat_source, lon_source) and specify your destination as latR,lonR
via ESMF you will get LR (time, latR, lonR)
DIFF = LR-R ; DIFF(time,latR,lonR)
On Wed, Mar 24, 2021 at 12:38 PM Chathurika via ncl-talk <ncl-talk at mailman.ucar.edu> wrote:
Dear Rashed
Many thanks for you email. I know this way. But what I want is regrid both dataset into one grid without removing the time dimension from it. To get the differences of datasets (HR-LR), I need to regrid them into the same dimension. Using the method you mentioned, I can plot the map. But how can I get the difference (HR-LR)?
Thanks once again and best,
Chathu
-----Original Messages-----
From:"Rashed Mahmood" <rashidcomsis at gmail.com>
Sent Time:2021-03-25 01:38:37 (Thursday)
To: Chathurika <chatu at scsio.ac.cn>
Cc:ncl-talk at mailman.ucar.edu
Subject: Re: [ncl-talk] ESMF regridding
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
_______________________________________________
ncl-talk mailing list
ncl-talk at mailman.ucar.edu
List instructions, subscriber options, unsubscribe:
https://mailman.ucar.edu/mailman/listinfo/ncl-talk
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
_______________________________________________
ncl-talk mailing list
ncl-talk at mailman.ucar.edu
List instructions, subscriber options, unsubscribe:
https://mailman.ucar.edu/mailman/listinfo/ncl-talk
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
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.ucar.edu/pipermail/ncl-talk/attachments/20210326/c4d28a7e/attachment.html>
More information about the ncl-talk
mailing list