Norwegian Service Centre for Climate Modelling -> Format Conversion Tools -> felt2grib / grib2felt User Guide
Felt to GRIB
The program felt2grib was written by Ole Vignes (DNMI), the version used by NoSerC is dated Jan. 16, 2001. The program is designed for unattended batch use, but requires an interface file to be defined for each specific conversion, where each Felt-parameter to be converted is explicitly typed and the corresponding GRIB-parameter is named with a scaling factor. This interface file is however possible to share between both felt2grib and grib2felt. A sample interface file will be provided to aid users in the conversion process.Usage:
felt2grib felt_file grib_file wmo2dnmi_table [options]
Where
- felt_file
- is the name of the FELT-file to be converted
- grib_file
- is then name of the GRIB-file to be created
- wmo2dnmi_table
- is the name of the interface file
- -o
- overwrite grib_file (default = append)
- -m
- input file is sequential (model) felt file
- -g <grid_no>
- grid no.
- -d <data_type>
- data type
- -T <YYYY,MM,DD,HH>
- set time (clim. data)
- -t <forecast_hour>
- forecast time (set if -T)
- -v <v.coord._no>
- vertical coordinate
- -p <parameter_no>
- parameter no.
- -l <level>
- level (no.)
- -n <producer_no>
- producer (1-99)
- -V <version_no>
- code table 2 version number
- -f
- write full level a,b coeff. for eta-data. (default is half level coeff.)
- -c
- write coeff. a1,b1...an,bn (default is a1..an,b1..bn)
- -D
- destagger u,v fields
- -S
- stagger u,v fields
- -U <undef>
- use <undef> as undefined value in grib_file (e.g. -t24 -v 1 -p2,3 -l 925,1000)
GRIB to Felt
The program grib2felt also comes from DNMI. The program is a virtual mirror of felt2grib, using the same interface file to name each parameter that shall be converted. In addition to this a special grid description file must also be given in order to translate grid information.However, a catch with this conversion is that the Felt-file must exist with predefined data before conversion starts. Parameters are thus only added/updated to existing Felt-files by this tool (see conversion between GRIB and netCDF for a similar problem issue). To create a new clean Felt-file the program nyfelt is required.
Usage:
grib2felt gribin feltut wmo2dnmi_table grids_table [options]
Where
- feltut
- is the name of the FELT-file to be updated
- gribin
- is then name of the GRIB-file to be converted
- wmo2dnmi_table
- is the name of the interface file
- grids_table
- is the name of the grid description file
- -p <parameter_no>
- parameter no. (grib)
- -v <v.coord._no>
- vertical coord. type (grib)
- -l <level>
- level (grib)
- -n <producer_no>
- set producer (1-99)
- -T <YYYY,MM,DD,HH>
- set time on output
- -t <forecast_hour>
- forecast time (set if -T)
- -a
- t=0 => an fields (def in)
- -D
- destagger u,v fields
- -H
- adjust grid d[xy]/2 for u,v
- -m
- output to sequential (unformatted) felt file
- -P <print_level>
- set amount of output: 0,1,2
- -u
- check for undefined values
Interface file examples
Below is shown two sample interface files, wmo2dnmi_table and grids_table for use in the felt2grib and grib2felt programs. Both files are also available on gridur.ntnu.no as /noserc/felles/bin/felt2grib.table and /noserc/felles/bin/grids.tablewmo typ lev dnmi par scal field (dnmi-unit) -------------------------------------------------- 1 103 0. 58 0 100. 'mslp ' (hPa) 1 105 0. 8 0 100. 'ps ' (hPa) 6 -1 -1. 1 0 9.80665 'fi ' (m) 7 -1 -1. 1 0 1. 'z ' (m) 6 105 0. 101 1 9.80665 'fis ' (m) 7 105 0. 101 1 1. 'zs ' (m) 11 -1 -1. 4 0 1. 't ' (K) 11 102 0. 103 1 1. 'tss ' (K) 11 105 0. 30 0 1. 'ts ' (K) 11 105 2. 31 0 1. 't2 ' (K) 11 105 999. 29 0 1. 'tsd ' (K) 11 105 998. 183 1 1. 'tsc ' (K) 13 -1 -1. 18 0 1. 'th ' (K) 33 -1 -1. 2 0 1. 'u ' (m/s) 33 105 10. 33 0 1. 'u10 ' (m/s) 34 -1 -1. 3 0 1. 'v ' (m/s) 34 105 10. 34 0 1. 'v10 ' (m/s) 39 -1 -1. 13 0 100. 'om ' (hPa/s) 40 -1 -1. 11 0 1. 'etadot' (1/s) 51 -1 -1. 9 0 1. 'q ' (kg/kg) 51 105 2. 82 0 1. 'q2 ' (kg/kg) 52 -1 -1. 10 0 0.01 'rh ' ([0,100]) 52 105 2. 32 0 0.01 'rh2 ' ([0,100]) 61 105 0. 17 0 1. 'prt ' (mm) 62 105 0. 19 0 1. 'prl ' (mm) 63 105 0. 20 0 1. 'prc ' (mm) 66 105 0. 66 0 1. 'sn ' (mm) 71 -1 -1. 39 0 0.01 'totcov' ([0,100]) 71 105 0. 25 0 0.01 'cov2d ' ([0,100]) 71 105 300. 39 0 0.01 'chigh ' ([0,100]) 71 105 500. 39 0 0.01 'cmean ' ([0,100]) 71 105 850. 39 0 0.01 'clow ' ([0,100]) 71 105 1000. 39 0 0.01 'cfog ' ([0,100]) 76 -1 -1. 22 0 1. 'cw ' (kg/kg) 76 105 0. 22 0 1. 'cwpath' (kg/(m*m)) 79 105 0. 179 1 0.01 'urb ' ([0,100]) 81 105 0. 181 1 0.01 'frl ' ([0,100]) 83 102 0. 83 0 1. 'rou ' (m) 83 105 0. 182 1 1. 'roc ' (m) 84 105 0. 184 1 0.01 'alb ' ([0,100]) 86 105 0. 86 0 1. 'sw ' (m) 86 105 999. 85 0 1. 'swd ' (m) 86 105 998. 186 1 1. 'swc ' (m) 91 102 0. 191 1 0.01 'fri ' ([0,100]) -1 -1 -1. -1 -1 -1. 'eof ' eof -------------------------------------------------- felt2grib.table - parameter conversion table wmo = wmo table number typ = felt level type lev = felt level par = 1 if felt is a parameter (costant) field dnmi = dnmi table number scal = scaling factor field = field name (character*6) dnmi-unit = unit in dnmi format ----------------------------------------------
grid nx ny g(1) g(2) g(3) g(4) g(5) g(6) description ---------------------------------------------------------------------- 101, 144, 37,-177.5, 90., 2.5, -2.5, 0., 0. 2.5deg sph (ec) 102, 240, 121,-178.5, 90., 1.5, -1.5, 0., 0. 1.5deg sph (ec) 1111, 144, 37,-180.0, 0., 2.5, 2.5, 0., 0. sph 256+257+258 (uk) 503, 61, 49, 25., 43., 79., -32., 0., 0. 150km pol (ec) 504, 93, 68, 54., 52., 79., 0., 0., 0. 150km pol (ec) 1006, 180, 176, 90., 142., 237., 0., 0., 0. 50km pol (EMEP testing) 1814, 121, 97, 59., 109., 237., -5., 0., 0. 50km pol (lam50s) 1840, 151, 133, 43., 121., 237., -32., 0., 0. 50km pol (lam50e) 1841, 170, 133, 43., 121., 237., -32., 0., 0. 50km pol (eurolam) 1905, 229, 196, 115., 148., 237., 0., 0., 0. 50km pol (hirlam) 1914, 98, 80, -23.5,-23.5, 0.5, 0.5, -5., 65. 0.50deg rot (hirlam) 2006, 188, 152, -46.5,-36.5, 0.5, 0.5, 0., 65. 0.50deg rot (hirlam) 2106, 96, 77, -47.0,-37.0, 1.0, 1.0, 0., 65. 1.00deg rot (test) 2010, 88, 202, 10.00,-6.50, 0.10, 0.10,-22.,66.0 0.10deg rot (hirlam10) 2021, 57, 50,-34.875,-30.375,1.125,1.125,0.,65. ERA boundary data 2023, 120, 105, -33.5,-28.5, 0.5, 0.5, 0., 65. ERA (hirlam RegClim) 2024, 120, 98, -33.5,-26.5, 0.5, 0.5, 0., 65. ERA (hirlam RegClim) 2065, 65, 26, -90.,18.139,2.8125,2.789, 0., 0. MPI test A 1997, 224, 324, 6.00,-13.0, 0.10, 0.10,-40.,68.0 0.10deg rot (hirlam10_big) -1, -1, -1, -1., -1., -1., -1., -1., -1. EOF ---------------------------------------------------------------------- grids.table - grid definition table definition of polarstereographic and spherical (rotated) grids. grid = grid number nx,ny = horisontal dimension g = grid definition parameters polarster grids: gr(i)=xp,yp,an,fi,0.,0. spherical grids: gr(i)=lon1,lat1,dlon,dlat,xcen,ycen ----------------------------------------------------------------------
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