Re: Fraction into mm

[1]
ncl-talk is for NCL related questions.
As far as units for variables, it is the responsibility of the
data provider to clarify any ambiguity related to units.
The data user should also do a search of the WWW for
possible information.

[2]
The file name is "soilw.0-10cm".

A **guess** would be the that units=fraction is relative to 10 cm.

Wei Huang wrote:
> Kalim,
>
> You may try:
>
> f = addfile("...", "r")
> soilw = f->soilw
> soilw@units = "mm"
>
> But, you need to know how to convert "fraction" to "mm".
>
> Good luck.
>
> Wei Huang
> huangwei@ucar.edu <mailto:huangwei@ucar.edu>
> VETS/CISL
> National Center for Atmospheric Research
> P.O. Box 3000 (1850 Table Mesa Dr.)
> Boulder, CO 80307-3000 USA
> (303) 497-8924
>
>
>
>
>
> On Oct 19, 2009, at 7:42 PM, kalim ullah wrote:
>
>> Respected Wei Huang,
>> Actually this file (soilw.0-10cm.gauss.2005.nc ) is opened given
>> below when I used it in NCL program the soil moisture unit indicates
>> in fraction but I want to change it into millimeter(mm). Due to this
>> reason I requested you, thanks for your cooperation.
>> best regards,
>> kalim
>> --- On *Mon, 10/19/09, Wei Huang /<huangwei@ucar.edu
>> <mailto:huangwei@ucar.edu>>/* wrote:
>>
>>
>> From: Wei Huang <huangwei@ucar.edu <mailto:huangwei@ucar.edu>>
>> Subject: Re: Fraction into mm
>> To: "kalim ullah" <kalimrid@yahoo.com <mailto:kalimrid@yahoo.com>>
>> Date: Monday, October 19, 2009, 8:20 AM
>>
>> Kalim,
>>
>> I have no idea what this is.
>> Sorry can not help you.
>>
>> Wei Huang
>> huangwei@ucar.edu
>> <http://us.mc537.mail.yahoo.com/mc/compose?to=huangwei@ucar.edu>
>> VETS/CISL
>> National Center for Atmospheric Research
>> P.O. Box 3000 (1850 Table Mesa Dr.)
>> Boulder, CO 80307-3000 USA
>> (303) 497-8924
>>
>>
>>
>>
>>
>> On Oct 19, 2009, at 9:09 AM, kalim ullah wrote:
>>
>>> Respected Wei Huang,
>>> I want to calculate a unit of mean Daily Volumetric Soil
>>> Moisture in mm but it is in fraction. kindly help me in this
>>> regards, it would be great favor. the file is given below.
>>> best regards,
>>> kalim
>>> netcdf soilw.0-10cm.gauss.2005 {
>>> dimensions:
>>> lon = 192 ;
>>> lat = 94 ;
>>> time = UNLIMITED ; // (365 currently)
>>> variables:
>>> float lat(lat) ;
>>> lat:units = "degrees_north" ;
>>> lat:actual_range = 88.542f, -88.542f ;
>>> lat:long_name = "Latitude" ;
>>> float lon(lon) ;
>>> lon:units = "degrees_east" ;
>>> lon:long_name = "Longitude" ;
>>> lon:actual_range = 0.f, 358.125f ;
>>> double time(time) ;
>>> time:units = "hours since 1-1-1 00:00:0.0" ;
>>> time:long_name = "Time" ;
>>> time:actual_range = 17566752., 17575488. ;
>>> time:delta_t = "0000-00-01 00:00:00" ;
>>> time:avg_period = "0000-00-01 00:00:00" ;
>>> short soilw(time, lat, lon) ;
>>> soilw:long_name = "mean Daily Volumetric Soil
>>> Moisture between 0-10 cm Below Ground Level" ;
>>> soilw:valid_range = 0.f, 1.f ;
>>> soilw:actual_range = 0.1f, 0.4335f ;
>>> soilw:units = "fraction" ;
>>> soilw:add_offset = 3.2765f ;
>>> soilw:scale_factor = 1.e-04f ;
>>> soilw:missing_value = 32766s ;
>>> soilw:precision = 4s ;
>>> soilw:least_significant_digit = 3s ;
>>> soilw:GRIB_id = 144s ;
>>> soilw:GRIB_name = "SOILW" ;
>>> soilw:var_desc = "Volumetric Soil Moisture\n",
>>> "DD" ;
>>> soilw:dataset = "NCEP Reanalysis Daily Averages" ;
>>> soilw:level_desc = "Between 0-10 cm BGL\n",
>>> "L" ;
>>> soilw:statistic = "Mean\n",
>>> "M" ;
>>> soilw:parent_stat = "Individual Obs\n",
>>> "I" ;
>>>
>>> // global attributes:
>>> :Conventions = "COARDS" ;
>>> :title = "4x daily NMC reanalysis (2005)" ;
>>> :history = "created 2005/01/03 by Hoop
>>> (netCDF2.3)" ;
>>> :description = "Data is from NMC initialized
>>> reanalysis\n",
>>> "(4x/day). It consists of T62 variables
>>> interpolated to\n",
>>> "pressure surfaces from model (sigma)
>>> surfaces." ;
>>> :platform = "Model
>>>
>>>
>>>
>>>
>>
>>
>
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Dennis J. Shea                  tel: 303-497-1361    |
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