metgrid.exe no running after using W2W geogrid files.

[Lagnajee]

Describe your issue

Hello all, i am also facing the issue wgile running metgrid. However i have replace the geo_em.d0*.nc files with the W2W generated nc files and replaced as by procedure. Do i need to change something in the geog_data_path? Please let me know...

I am having this error "Processing domain 1 of 4 | ERROR: Couldn't open file ./geo_em.d01.nc for input."

w2w --version

w2w 0.5.0

nc-config --all

This netCDF 4.8.1 has been built with the following features: 

  --cc            -> /usr/bin/cc
  --cflags        -> -I/usr/include -I/usr/include/hdf5/serial
  --libs          -> -L/usr/lib/x86_64-linux-gnu -L/usr/lib/x86_64-linux-gnu/hdf5/serial -lnetcdf
  --static        -> -lhdf5_hl -lhdf5 -lcrypto -lcurl -lpthread -lsz -lz -ldl -lm

  --has-c++       -> no
  --cxx           -> 

  --has-c++4      -> no
  --cxx4          -> 

  --has-fortran   -> yes
  --fc            -> gfortran
  --fflags        -> -I/usr/include -I/usr/include
  --flibs         -> -L/usr/lib/x86_64-linux-gnu -lnetcdff -Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -flto=auto -Wl,-z,relro -Wl,-z,now -lnetcdf -lnetcdf -lm
  --has-f90       -> 
  --has-f03       -> yes

  --has-dap       -> yes
  --has-dap2      -> yes
  --has-dap4      -> yes
  --has-nc2       -> yes
  --has-nc4       -> yes
  --has-hdf5      -> yes
  --has-hdf4      -> no
  --has-logging   -> no
  --has-pnetcdf   -> no
  --has-szlib     -> yes
  --has-cdf5      -> yes
  --has-parallel4 -> no
  --has-parallel  -> no
  --has-nczarr    -> yes

  --prefix        -> /usr
  --includedir    -> /usr/include
  --libdir        -> /usr/lib/x86_64-linux-gnu
  --version       -> netCDF 4.8.1

Installed Packages

numpy==1.23.1

Traceback

No response

[dargueso]

When do you get this error? Running metgrid.exe? It looks like you haven't copied the geo_em files to the WPS folder, could it be? Because it is complaining that it doesn't find the file at all...

[Lagnajee]

@dargueso i have renamed geo_em.d01_41.nc to geo_em.d01.nc...... similarly for 2nd and 3rd domain and geo_em.d04_LCZ_params.nc to geo_em.d04.nc. I have removed the original geo_em files and only keep those renamed files made through W2W in the WPS directory.
I am getting this error while running the metgrid.exe

[Lagnajee]

@dargueso sisnt get any solution till now. Please let me know if there are any possible solutions

[dargueso]

Can you open the file with ncview or ncdump to inspect it? Because it is complaining it can even open it

[Lagnajee]

yes i can open all the geogrid files with ncview and also run ncdump and inspect

[Lagnajee]

&share
wrf_core = 'ARW'
max_dom = 4
start_date = '2022-10-06_00:00:00', '2022-10-06_00:00:00', '2022-10-06_00:00:00', '2022-10-06_00:00:00'
end_date = '2022-10-10_00:00:00', '2022-10-10_00:00:00', '2022-10-10_00:00:00', '2022-10-10_00:00:00'
interval_seconds = 3600
io_form_geogrid = 2
debug_level = 0
/

&geogrid
parent_id = 1, 1, 2, 3
parent_grid_ratio = 1, 3, 3, 3
i_parent_start = 1, 20, 40, 124
j_parent_start = 1, 20, 39, 135
e_we = 98, 172, 295, 157
e_sn = 100, 154, 265, 148
geog_data_res = 'default', 'default', 'default', 'default'
dx = 30000,
dy = 30000,
map_proj = 'mercator',
ref_lat = 17.330,
ref_lon = 78.464,
truelat1 = 16.007,
truelat2 = 00.0,
stand_lon = 78.4,
pole_lat = 90
pole_lon = 0

geog_data_path = '/home/lagnajeet/jasper-1.900.1/Build_WRF/WPS_GEOG'
opt_geogrid_tbl_path = './geogrid'
/

&ungrib
out_format = 'WPS'
prefix = 'PL'
/

&metgrid
fg_name = 'PL','SFC'
io_form_metgrid = 2
opt_metgrid_tbl_path = './metgrid'
/
This is my namelist file

[ZYFno996]

I found the reason. WPS default nc file is NETCDF3_64BIT_OFFSET data model and NETCDF3 format file. But w2w nc file is NETCDF4 data model, HDF5 format file. Read .nc file by python library netCDF can catch this information. You need to write another python script to convert these formats as follows and then there will be no problems to run metgrid.exe.

1. Read by xarray:
   ds=xr.open_dataset(r"[W2W FILENAME]")
2. Rewrite files:
   ds.to_netcdf(r"[CONVERTED W2W FILENAME]",format="NETCDF3_64BIT")