[ncl-talk] strange output from NCL

[Caspar Ammann]

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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