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950808: netcdf files

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  • Subject: 950808: netcdf files
  • Date: Tue, 08 Aug 1995 14:35:55 -0600
>From: Steve Adams <address@hidden>
>Organization: Auburn
>Keywords: 199508081846.AA24279 WXP netCDF

Steve,

>I have a question regarding the display of netcdf files in WXP, but was
>not sure where to pose the question. So... would you guys pass it on to
>the appropriate place if necessary? Thanks. My question:
>
>A colleague is sending me some grid files from the RAMS mesoscale model.
>They are in netcdf format. How can I display them using WXP? 

WXP can read some netCDF files, but it does not have the ability to read
in arbitrary netCDF files.

>Couldn't
>seem to get it right using contour or grbcalc. Have tried various
>iterations of ncdump, ncgen and even gribtonc with a .cdl from ncdump.

What are you attempting to do with ncdump?  One application that is
able to do a pretty good job on reading arbitrary netCDF files is the
commercially available IDL package.  Do you have access to this package
at Auburn?

>Here is the output from a "ncdump -c" on one of the files....
>
>Any help would be greatly appreciated.
>
>----------------------------------------------------------------
>Stephen D. Adams                Internet: address@hidden
>NOAA/National Weather Service   (334) 844-4514 (voice)
>SE Ag Weather Service Center   (334) 887-4511 (FTS)
>Auburn University, Alabama     (334) 844-5933 (FAX)
>Snail-Mail:
>National Weather Service, PO Box 3267, Auburn, AL 36831-3267
>www: http://www.awis.auburn.edu  gopher: gopher.awis.auburn.edu
>----------------------------------------------------------------
>
>netcdf 951661200 {
>dimensions:
>       level = 21 ;
>       fctimes = 1 ;
>       namelen = 132 ;
>       lat = 61 ;
>       lon = 49 ;
>       n_2d_grids = 189 ;
>       var_len = 4 ;
>       coord_len = 5 ;
>       unit_len = 11 ;
>       comm_len = 126 ;
>       domain_len = 12 ;
>       asc_len = 18 ;
>
>variables:
>       float rz(fctimes, level, lat, lon) ;
>               rz:long_name = "RAMS model height" ;
>               rz:units = "meters" ;
>               rz:valid_range = -200.f, 200.f ;
>               rz:_FillValue = 9.9999999e+36f ;
>               rz:LAPS_var = "HT" ;
>               rz:lvl_coord = "HPA " ;
>               rz:LAPS_units = "METERS" ;
>       float ru(fctimes, level, lat, lon) ;
>               ru:long_name = "RAMS eastward wind" ;
>               ru:units = "meters/second" ;
>               ru:valid_range = -200.f, 200.f ;
>               ru:_FillValue = 9.9999999e+36f ;
>               ru:LAPS_var = "U3" ;
>               ru:lvl_coord = "HPA " ;
>               ru:LAPS_units = "M/S" ;
>       float rv(fctimes, level, lat, lon) ;
>               rv:long_name = "RAMS northward wind" ;
>               rv:units = "meters/second" ;
>               rv:valid_range = -200.f, 200.f ;
>               rv:_FillValue = 9.9999999e+36f ;
>               rv:LAPS_var = "V3" ;
>               rv:lvl_coord = "HPA " ;
>               rv:LAPS_units = "M/S" ;
>       float rw(fctimes, level, lat, lon) ;
>               rw:long_name = "RAMS omega" ;
>               rw:units = "pascals/second" ;
>               rw:valid_range = -20000.f, 20000.f ;
>               rw:_FillValue = 9.9999999e+36f ;
>               rw:LAPS_var = "OM" ;
>               rw:lvl_coord = "HPA " ;
>               rw:LAPS_units = "PA/S" ;
>       float rt(fctimes, level, lat, lon) ;
>               rt:long_name = "RAMS temperature" ;
>               rt:units = "degrees Kelvin" ;
>               rt:valid_range = 0.f, 100.f ;
>               rt:_FillValue = 9.9999999e+36f ;
>               rt:LAPS_var = "T3" ;
>               rt:lvl_coord = "HPA" ;
>               rt:LAPS_units = "K" ;
>       float rsh(fctimes, level, lat, lon) ;
>               rsh:long_name = "RAMS specific humidity" ;
>               rsh:units = "kg/kg" ;
>               rsh:valid_range = 0.f, 0.1f ;
>               rsh:_FillValue = 9.9999999e+36f ;
>               rsh:LAPS_var = "SH" ;
>               rsh:lvl_coord = "HPA" ;
>               rsh:LAPS_units = "          " ;
>       float rh3(fctimes, level, lat, lon) ;
>               rh3:long_name = "RAMS relative humidity" ;
>               rh3:units = "percent" ;
>               rh3:valid_range = 0.f, 100.f ;
>               rh3:_FillValue = 9.9999999e+36f ;
>               rh3:LAPS_var = "RH3" ;
>               rh3:lvl_coord = "HPA" ;
>               rh3:LAPS_units = "PERCENT" ;
>       float lwc(fctimes, level, lat, lon) ;
>               lwc:long_name = "RAMS cloud liquid water" ;
>               lwc:units = "grams/meter**3" ;
>               lwc:valid_range = 0.f, 100.f ;
>               lwc:_FillValue = 9.9999999e+36f ;
>               lwc:LAPS_var = "LWC" ;
>               lwc:lvl_coord = "HPA" ;
>               lwc:LAPS_units = "G/M**3" ;
>       float ice(fctimes, level, lat, lon) ;
>               ice:long_name = "RAMS cloud ice" ;
>               ice:units = "grams/meter**3" ;
>               ice:valid_range = 0.f, 100.f ;
>               ice:_FillValue = 9.9999999e+36f ;
>               ice:LAPS_var = "ICE" ;
>               ice:lvl_coord = "HPA" ;
>               ice:LAPS_units = "G/M**3" ;
>       long lvl(n_2d_grids) ;
>       long imax ;
>       long jmax ;
>       long kmax ;
>       long kdim ;
>       char rz_comment(fctimes, level, comm_len) ;
>       char ru_comment(fctimes, level, comm_len) ;
>       char rv_comment(fctimes, level, comm_len) ;
>       char rw_comment(fctimes, level, comm_len) ;
>       char rt_comment(fctimes, level, comm_len) ;
>       char rsh_comment(fctimes, level, comm_len) ;
>       char rh3_comment(fctimes, level, comm_len) ;
>       char lwc_comment(fctimes, level, comm_len) ;
>       char ice_comment(fctimes, level, comm_len) ;
>       char laps_domain_file(domain_len) ;
>       char asctime(asc_len) ;
>       short fctimes(fctimes) ;
>               fctimes:long_name = "forecast times" ;
>       short level(level) ;
>               level:long_name = "level" ;
>       short rz_fcinv(fctimes, level) ;
>               rz_fcinv:_FillValue = 0s ;
>       short ru_fcinv(fctimes, level) ;
>               ru_fcinv:_FillValue = 0s ;
>       short rv_fcinv(fctimes, level) ;
>               rv_fcinv:_FillValue = 0s ;
>       short rw_fcinv(fctimes, level) ;
>               rw_fcinv:_FillValue = 0s ;
>       short rt_fcinv(fctimes, level) ;
>               rt_fcinv:_FillValue = 0s ;
>       short rsh_fcinv(fctimes, level) ;
>               rsh_fcinv:_FillValue = 0s ;
>       short rh3_fcinv(fctimes, level) ;
>               rh3_fcinv:_FillValue = 0s ;
>       short lwc_fcinv(fctimes, level) ;
>               lwc_fcinv:_FillValue = 0s ;
>       short ice_fcinv(fctimes, level) ;
>               ice_fcinv:_FillValue = 0s ;
>       char origin(namelen) ;
>       char model(namelen) ;
>       long version ;
>       long num_variables ;
>
>data:
>
> fctimes = 0 ;
>
> level = 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 
>    750, 800, 850, 900, 950, 1000, 1050, 1100 ;
>}

Tom Yoksas