[ferret_users] shifted Hovmoller plot

[Fan Fang <Fan.Fang@xxxxxxxx>]

I am trying to use Ferret to do a Hovmoller plot with a simple netCDF file.

Wonder why the Hovmoller plot came out slightly shifted upward (by ~6 hours; attached).  The header of the CDL is below.  I can send the netcdf file also if needed but thought the problem could be just some mistake using Ferret.

Thanks.

-Fan

> ferret/bin/ferret
     NOAA/PMEL TMAP
     FERRET v6.85 
     Linux 2.6.32-358.23.2.el6.x86_64 64-bit - 11/12/13
     19-Feb-14 12:28    

yes? use test.nc
yes? show data
     currently SET data sets:
    1> ./test.nc  (default)
 name     title                             I         J         K         L         M         N
 OMAERUVD_003_FINALAEROSOLEXTOPTICALDEPTH388
          Aerosol Optical Depth 388 nm (n  1:360     ...       ...       1:5       ...       ...
 
yes? shade OMAERUVD_003_FINALAEROSOLEXTOPTICALDEPTH388


The values of the time and 'time_bnds' variables are:

time = 1136073600, 1136160000, 1136246400, 1136332800, 1136419200 ;
time_bnds =
  1136073600, 1136160000,
  1136160000, 1136246400,
  1136246400, 1136332800,
  1136332800, 1136419200,
  1136419200, 1136505600 ;

netcdf test {
dimensions:
    bnds = 2 ;
    time = UNLIMITED ; // (5 currently)
    lon = 360 ;
variables:
    int time_bnds(time, bnds) ;
    float OMAERUVd_003_FinalAerosolExtOpticalDepth388(time, lon) ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:_FillValue = -1.267651e+30f ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:units = "1" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:title = "Final Aerosol Extinction Optical Depth at 388 nm" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:UniqueFieldDefinition = "OMI-Specific" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:missing_value = -1.267651e+30f ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:origname = "FinalAerosolExtOpticalDepth388" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:fullnamepath = "/HDFEOS/GRIDS/Aerosol NearUV Grid/Data Fields/FinalAerosolExtOpticalDepth388" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:orig_dimname_list = "XDim " ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:standard_name = "finalaerosolextopticaldepth388" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:quantity_type = "Total Aerosol Optical Depth" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:product_short_name = "OMAERUVd" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:product_version = "003" ;
        OMAERUVd_003_FinalAerosolExtOpticalDepth388:long_name = "Aerosol Optical Depth 388 nm (near-UV), OMI, 1 x 1 deg." ;
    float lon(lon) ;
        lon:standard_name = "longitude" ;
        lon:units = "degrees_east" ;
        lon:long_name = "Longitude" ;
    int time(time) ;
        time:standard_name = "time" ;
        time:units = "seconds since 1970-01-01 00:00:00" ;
        time:bounds = "time_bnds" ;
        time:calendar = "JULIAN" ;

// global attributes:
        :Conventions = "CF-1.4" ;
        :start_time = "2006-01-01T00:00:00Z" ;
        :end_time = "2006-01-05T23:59:59Z" ;
        :temporal_resolution = "daily" ;
        :nco_openmp_thread_number = 1 ;
        :NCO = "4.3.1" ;
        :plot_hint_title = "Latitude-Averaged Hovmoller ( 90S - 90N )" ;
        :plot_hint_subtitle = "daily 1 x 1 deg. Aerosol Optical Depth 388 nm (near-UV), OMI, 1 x 1 deg. [OMAERUVd v3]" ;
        :plot_hint_x_axis_label = "Longitude" ;
        :plot_hint_y_axis_label = "Time" ;
        :plot_hint_caption = "Selected latitude range was 90S - 90N. The variable Aerosol Optical Depth 388 nm (near-UV), OMI, 1 x 1 deg. [OMAERUVd v3] has a limited data extent of 90S - 90N.  The longitude range in the title reflects the data extent of the subsetted granules that went into making this result." ;
}

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