[ncl-talk] strange output from NCL

[Guilherme Martins]

Hi,

when your data is short like that, you have to unpack, for example, unpack
short to float, use

f=addfile (your.nc,r)
x=short2flt (f->var)

guilherme

Em Sex, 29 de abr de 2016 09:14, Saurabh Singh <saurabhsingh123op at gmail.com>
escreveu:

> This solves, Its the fist time i encountered a file with encoding like
> this. Thanks a lot Casper.
>
> On Fri, Apr 29, 2016 at 7:50 PM, Caspar Ammann <ammann at ucar.edu> wrote:
>
>> Look in the attributes list of your variable dump. There are
>> “scale_factor", and "add_offset”. Once you apply those to your numbers, you
>> are fine. Some software packages apply these automatically once you open
>> the variable, and sometimes (particularly when looking into the file) you
>> still need to apply them.
>> Caspar
>>
>> Caspar Ammann
>> National Center for Atmospheric Research
>> RAL - Climate Science and Applications Program
>>
>> On Apr 29, 2016, at 4:56 AM, Saurabh Singh <saurabhsingh123op at gmail.com>
>> wrote:
>>
>> I am opening the Reanalysis-2 wind data first i tried in CDO, The data
>> has wind value so the min/max range -10 to 10.  However when i tried
>> opening this data in NCL i get strange outputs i.2 in range 0f -2000. I
>> don't why this is hapening.I am pasting the output along with the data.
>>
>> CDO Output
>> cee2 at cee2:~$ cdo info SV10.nc
>>     -1 :       Date     Time   Level Gridsize    Miss :     Minimum
>>   Mean     Maximum : Parameter ID
>>      1 : 2000-01-01 00:00:00      10      304       0 :     -8.2600
>> -1.6862      6.7400 : -1
>>      2 : 2000-01-02 00:00:00      10      304       0 :     -8.1600
>> -1.7035      5.1700 : -1
>>      3 : 2000-01-03 00:00:00      10      304       0 :     -9.7900
>> -1.7118      5.8700 : -1
>>      4 : 2000-01-04 00:00:00      10      304       0 :     -10.240      0.11095
>>     8.8300 : -1
>> ......
>> ....
>>
>>
>> NCL outputs:
>>
>> Number of Dimensions: 4
>> Dimensions and sizes: [time | 2922] x [level | 1] x [lat | 16] x [lon |
>> 19]
>> Coordinates:
>>             time: [1753152..1823256]
>>             level: [10..10]
>>             lat: [14.2855..-14.2855]
>>             lon: [90..123.75]
>> Number Of Attributes: 20
>>   cell_methods : time: mean (of 4 6-hourly values in one day)
>>   standard_name : eastward_wind
>>   parent_stat : Individual Obs
>>   statistic : Mean
>>   level_desc : 10 m
>>   dataset : NCEP/DOE AMIP-II Reanalysis (Reanalysis-2) Daily Averages
>>   var_desc : u-wind
>>   GRIB_name : U GRD
>>   GRIB_id : 33
>>   least_significant_digit : 1
>>   precision : 2
>>   missing_value : 32766
>>   scale_factor : 0.01
>>   add_offset : 207.65
>>   units : m/s
>>   actual_range : ( -32.79, 37.59 )
>>   unpacked_valid_range : ( -120, 120 )
>>   valid_range : ( -32765, -8765 )
>>   long_name : Daily Forecast of U-wind at 10 m
>>   _FillValue : -32767
>> (0,0,0,0) -21257
>> (0,0,0,1) -21082
>> (0,0,0,2) -20933
>> (0,0,0,3) -20810
>> (0,0,0,4) -20792
>> (0,0,0,5) -20868
>> (0,0,0,6) -21008
>> (0,0,0,7) -21122
>> (0,0,0,8) -21094
>> ....
>> With regards
>> Saurabh Kumar singh
>>
>>
>>  *P** : * *Please consider the environment before printing this e-mail*
>>
>>
>>
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>>
>>
>
>
> --
> With regards
> Saurabh Kumar singh
>
>  *P** : * *Please consider the environment before printing this e-mail*
>
>
>
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-- 
------------------------------------------------------------------------------------------
Dr. Guilherme Martins
Instituto Nacional de Pesquisas Espaciais (INPE)
Centro de Previsão de Tempo e Estudos Climáticos (CPTEC)
Grupo de Desenvolvimento em Assimilação de Dados (GDAD)
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E-mail: guilherme.martins at inpe.br || jgmsantos at gmail.com
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