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Re: time bounds
Hi Mark,
I've had similar problems. As far as I know, descriptors cannot handle
irregular within-NetCDF-file time axes (as of Ferret v5.70). This
capability would be a most welcome addition in the future!
A workaround is to regrid your variables to the correct time axis in
Ferret. The hard part is defining the time axis; monthly data is
especially tricky due to leap years etc. The days1900 function can help
with this.
In our model data we're lucky enough to have the time axis values
available as an additional variable in the NetCDF file, so I just regrid
to those. Otherwise, you could use ncrcat to concatenate just the time
axis values from your NetCDF files into small new file, and then use those
in Ferret.
Andrew
On Mon, 18 Oct 2004 Mark.Collier@csiro.au wrote:
> Hi
>
> The following descriptor file works o.k., however, it assumes that each
> month is of equal size. Is there some way of getting ferret to use the
> time bounds information used in the individual files? These separate
> files have different time values and upper and lower limits. This would
> enable more accurate analysis/plots.
>
> Thanks,
> Mark.
>
> &FORMAT_RECORD
> D_TYPE = ' MC'
> D_FORMAT = ' 1A'
> /
>
> &BACKGROUND_RECORD
> D_TITLE = '20C3M Experiment'
> D_T0TIME = '16-DEC-1870 12:00:00'
> D_TIME_UNIT = 2628000.0
> D_TIME_MODULO = .FALSE.
> D_CALTYPE = 'NOLEAP'
> /
>
> &MESSAGE_RECORD
> D_MESSAGE = ' '
> D_ALERT_ON_OPEN = .FALSE.
> D_ALERT_ON_OUTPUT = .FALSE.
> /
>
> &EXTRA_RECORD /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1871-
> 1880_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 1
> S_END = 120
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1881-
> 1890_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 121
> S_END = 240
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1891-
> 1900_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 241
> S_END = 360
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1901-
> 1910_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 361
> S_END = 480
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1911-
> 1920_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 481
> S_END = 600
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1921-
> 1930_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 601
> S_END = 720
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1931-
> 1940_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 721
> S_END = 840
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1941-
> 1950_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 841
> S_END = 960
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1951-
> 1960_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 961
> S_END = 1080
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1961-
> 1970_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 1081
> S_END = 1200
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1971-
> 1980_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 1201
> S_END = 1320
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1981-
> 1990_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 1321
> S_END = 1440
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME =
> '/cs/datastore/csdar/cec006/ocean/ipcc/data/20C3M/A1a/run1/psl_A1a_1991-
> 2000_20C3M_run1.nc'
> S_AUX_SET_NUM = 0
> S_START = 1441
> S_END = 1560
> S_DELTA = 1
> S_NUM_OF_FILES = 1
> S_REGVARFLAG = ' '
> /
>
> &STEPFILE_RECORD
> S_FILENAME = '**END OF STEPFILES**'
> /
>
>
+--------------------------------------------------------------+
| Dr. Andrew T. Wittenberg | Mailing address: |
| Physical Scientist, GFDL/NOAA | US DOC/GFDL |
| Andrew.Wittenberg@noaa.gov | Attn: Andrew Wittenberg |
| Voice: (609) 987-5064 | Forrestal Campus, US Route 1 |
| Fax: (609) 987-5063 | Princeton, NJ 08542 |
+--------------------------------------------------------------+
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