[ncl-talk] Interpolating CCSM grid to RAP/HRRR grid
Wilson, Malcolm Tyree
mtw5270 at psu.edu
Wed May 12 10:18:10 MDT 2021
Hi again,
rgird2rcm ran fine without any errors, thank you! However, I'm still getting back nothing but filled values (every point is a fill value) in the returned, interpolated array. I even adjusted the data type of fi to double to see if that was causing issues, but the same issue appears. Below is the code that I'm using now, along with the data summary of both fi and the output (fi after interpolation) arrays. I'm wondering if this is supposed to happen, or is there something I'm missing? Thanks!
;Interpolation
f = addfile ("~/small_hus_may_pert_2010-2050.nc","r")
g = addfile ("~/hrrr.t00z.wrfprsf00.nc","r")
lat = f->lat
lon = f->lon
lat2d = g->gridlat_0 ; (N,M)
lon2d = g->gridlon_0
;LATD = todouble(lat2d) ; (N*M)
;LOND = (lon2d)
fi = f->hus_pert
hrrr_grid_data = rgrid2rcm_Wrap(lat,lon,fi,lat2d,lon2d, 0)
printVarSummary(hrrr_grid_data)
Variable: fi
Type: float
Total Size: 228384 bytes
57096 values
Number of Dimensions: 4
Dimensions and sizes: [time | 1] x [lev | 26] x [lat | 36] x [lon | 61]
Coordinates:
time: [ 0.. 0]
lev: [0.9925562..0.00354464]
lat: [20.26178..53.24607]
lon: [225..300]
Number Of Attributes: 1
units : kg/kg
Variable: hrrr_grid_data
Type: float
Total Size: 198134664 bytes
49533666 values
Number of Dimensions: 4
Dimensions and sizes: [time | 1] x [lev | 26] x [ygrid_0 | 1059] x [xgrid_0 | 1799]
Coordinates:
time: [ 0.. 0]
lev: [0.9925562..0.00354464]
Number Of Attributes: 3
_FillValue : 9.96921e+36
units : kg/kg
ncl : rgrid2rcm used for interpolation
________________________________
From: 아나유즈바시츠 <ajuzbasic at pusan.ac.kr>
Sent: Wednesday, May 12, 2021 8:06 AM
To: Wilson, Malcolm Tyree <mtw5270 at psu.edu>
Cc: ncl-talk at ucar.edu <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] Interpolating CCSM grid to RAP/HRRR grid
Hi Malcom,
Apologies, I mixed it up. The function you need is rgrid2rcm, which is, as you said, opposite of rcm2rgrid. This one: http://www.ncl.ucar.edu/Document/Functions/Built-in/rgrid2rcm.shtml<https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.ncl.ucar.edu%2FDocument%2FFunctions%2FBuilt-in%2Frgrid2rcm.shtml&data=04%7C01%7Cmtw5270%40psu.edu%7C9f1ea306fc124903ca7308d9153e5a20%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C1%7C637564179828314466%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=dHzt0YSIMNPq61oYEX2kWf9Y%2FRKjSuhSqB11FZwZI1A%3D&reserved=0>. This should do what you want, without giving you all the missing values.
On Wed, May 12, 2021 at 9:00 PM Wilson, Malcolm Tyree <mtw5270 at psu.edu<mailto:mtw5270 at psu.edu>> wrote:
Hi,
So, I'm trying to re-grid from a rectilinear grid (CCSM) to a curvilinear grid (HRRR). The CCSM had one-dimensional coordinates arrays while the HRRR has 2-dimensional coordinate arrays. So, the opposite of what rcm2rgrid is doing, which is why I tried using linint2_points_Wrap instead. Thanks!
-Malcolm W.
________________________________
From: 아나유즈바시츠 <ajuzbasic at pusan.ac.kr<mailto:ajuzbasic at pusan.ac.kr>>
Sent: Tuesday, May 11, 2021 10:42 PM
To: Wilson, Malcolm Tyree <mtw5270 at psu.edu<mailto:mtw5270 at psu.edu>>
Cc: ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu> <ncl-talk at ucar.edu<mailto:ncl-talk at ucar.edu>>
Subject: Re: [ncl-talk] Interpolating CCSM grid to RAP/HRRR grid
Hi Malcom,
It seems to me that you are trying to regrid from curvilinear grid (with 2D lat and lon) to rectilinear grid. You should rcm2rgrid function for that, not linint, as the linint one is meant to interpolate from one rectilinear grid to another.
Try to use this https://www.ncl.ucar.edu/Document/Functions/Contributed/rcm2rgrid_Wrap.shtml<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ncl.ucar.edu%2FDocument%2FFunctions%2FContributed%2Frcm2rgrid_Wrap.shtml&data=04%7C01%7Cmtw5270%40psu.edu%7C9f1ea306fc124903ca7308d9153e5a20%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C1%7C637564179828324453%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=gqC2iltJNNr6mxVcQVabWp6xmzOj8i%2FbICeZ%2Fz9QRP4%3D&reserved=0>
On Wed, May 12, 2021 at 10:51 AM Wilson, Malcolm Tyree via ncl-talk <ncl-talk at mailman.ucar.edu<mailto:ncl-talk at mailman.ucar.edu>> wrote:
Hello Everyone,
I've been trying to interpolate humidity and temperature data from CCSM to the RAP/HRRR grid using NCL (specifically using the function linint2_points and linint2_points_Wrap). I created a script that should interpolate the data from CCSM to the HRRR grid, but the script returned an array that contains nothing but filled values (9.96921e+36) and no data of the variable field I'm interpolating. I don't understand this happened, and I used both the linint2_points and linint2_points_Wrap functions. Is this supposed to happen, or and I'm missing something? Below is the code I used. Any advice would be appreciated. Thanks!
-Malcolm W.
f = addfile ("~/small_hus_may_pert_2010-2050.nc<https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fsmall_hus_may_pert_2010-2050.nc%2F&data=04%7C01%7Cmtw5270%40psu.edu%7C9f1ea306fc124903ca7308d9153e5a20%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C1%7C637564179828324453%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=ogr4icTWYUSpDkU0ZLWAKBEu2kQvuJTYCsxC6yx90w4%3D&reserved=0>","r")
g = addfile ("~/hrrr.t00z.wrfprsf00.nc<https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fhrrr.t00z.wrfprsf00.nc%2F&data=04%7C01%7Cmtw5270%40psu.edu%7C9f1ea306fc124903ca7308d9153e5a20%7C7cf48d453ddb4389a9c1c115526eb52e%7C0%7C1%7C637564179828334443%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=tS66RAR%2FoHbgmc0P4E%2FBjOsuUG9pX5jjbsza0WJu5Rk%3D&reserved=0>","r")
lat = f->lat ;(length=36)
lon = f->lon ;(length=61)
lat2d = g->gridlat_0 ; (shape: (1059,1799))
lon2d = g->gridlon_0 ; (shape: (1059,1799))
LAT1D = ndtooned(lat2d)
LON1D = ndtooned(lon2d)
fi = f->hus_pert ;(humidity data I'm interpolating)
fo = linint2_points_Wrap(lon,lat,fi, False, LON1D,LAT1D, 0)
hrrr_data = onedtond( ndtooned(fo), (/1,26,1059,1799/) ) ;(conatins nothing but filled values)
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