conversion grib data to nc

I have grib data and use ncl_convert2nc to convert them to netcdf (just
simply type ncl_convert2nc <grib_file_name>). I noticed coordinate
values (lat/long) changed slightly after the conversion. The fraction
changed, e.g.

grib file
25.0625 -124.9375

to

nc file
25.0629997 -124.938004

This makes wonder values for all the other variables in grib file
changed too. I will need to figure out what is causing this and fix it.

The grib file can be downloaded from
ftp://nomad6.ncep.noaa.gov/pub/raid2/wd20yx/nldas/NLDASII_Forcing/2008/20080101/2008010100.nldasforce-a.grb

Any help appreciated.

Naoki

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Received on Tue Apr 3 10:43:55 2012