[ncl-talk] Errors while trying to plot IAGOS data. Only the contour map plot, but the data is missing.

[najib.yusuf at carnasrda.com]

On 2017-09-27 13:41, Dennis Shea wrote:
> You stated:  "I tried solving but couldn't get it"
> 
> Please look at the output from your commands.
> 
> The  output is  for *you* to look at.
> 
> ----
> 
> More on David's comment ...
> 
> re: GOLDEN RULE OF DATA PROCESSING... LOOK AT YOUR DATA
> 
> You used:
> 
>    var = f->O3_PM(0)   <==== the reads only the 1st value [index (0) ]
> 
> Variable: var
> Type: double
> Total Size: 8 bytes
>             1 values           <=== ONE VALUE ... how do you contour
> one value?
> 
> ---
> 
> The min & max are _FillValue. Look at the output from your script.
> 
> (0)    min/max var = -9999/-9999
> ---
> 
> Even if you read  the entire *time  series* ... all values are
> _FillValue
> 
>    var = f->O3_PM    ;   entire series
> 
>    printVarSummary(var)
> 
> Variable: var
> Type: double
> Total Size: 63024 bytes
>             7878 values
> Number of Dimensions: 1
> Dimensions and sizes:   [UTC_time | 7878]    <=========
> Coordinates:
>             UTC_time: [70841..106359]
> Number Of Attributes: 8
>   standard_name :       mole_fraction_of_ozone_in_air
>   long_name :   Ozone mixing ratio
>   comment :     Measured by MOZAIC package
>   units :       0.000000001
>   missing_value :       -9999
>   _FillValue :  -9999
>   scale_factor :         1
>   availability :         0
> 
> print ("min/max var = " + min(var) + "/" + max(var))
> (0)     MIN/MAX VAR = -9999/-9999
> 
> ---
> 
> It should be plotted as a time series not as a contour plot.
> 
> On Wed, Sep 27, 2017 at 10:34 AM, David Brown <dbrown at ucar.edu> wrote:
> 
>> You will never be able to contour the O3_PM variable from this file
>> because it contains only fill values:
>> 
>> ncl 0> f = addfile("IAGOS_timeseries_2013101819404151.nc [1]","r")
>> ncl 1> printMinMax(f->O3_PM,0)
>> (0) Ozone mixing ratio (0.000000001) : min=-9999   max=-9999
>> 
>> Presumably this is what the attribute "availability" means: no valid
>> values for this variable.
>> 
>> Also for some reason your variable "var" contains only a single
>> value.
>> There is no way to make a contour plot with only one point even if
>> it
>> were a valid value. Since the only dimension in the file is a time
>> dimension, maybe this data set would be better displayed as a time
>> series x-y plot.
>> -dave
>> 
>> On Wed, Sep 27, 2017 at 8:16 AM,  <najib.yusuf at carnasrda.com> wrote:
>>> 
>>> Dear Sirs,
>>> 
>>> I try to plot contour map of O3_PM variable from .nc IAGOS file
>> but I am
>>> getting strange errors, I tried solving but couldn't get it.
>> Kindly assist
>>> to guide. Attached is the file and the IAGOS.ncl as script.Thank
>> you.
>>> 
>>> The summary of the print var is;
>>> 
>>> Variable: var
>>> Type: double
>>> Total Size: 8 bytes
>>> 1 values
>>> Number of Dimensions: 1
>>> Dimensions and sizes:   [UTC_time | 1]
>>> Coordinates:
>>> Number Of Attributes: 9
>>> UTC_time :    70841
>>> standard_name :       mole_fraction_of_ozone_in_air
>>> long_name :   Ozone mixing ratio
>>> comment :     Measured by MOZAIC package
>>> units :       0.000000001
>>> missing_value :       -9999
>>> _FillValue :  -9999
>>> scale_factor :         1
>>> availability :         0
>>> 
>>> 
>>> Variable: var
>>> Type: double
>>> Total Size: 8 bytes
>>> 1 values
>>> Number of Dimensions: 1
>>> Dimensions and sizes:   [UTC_time | 1]
>>> Coordinates:
>>> Number Of Attributes: 9
>>> UTC_time :    70841
>>> standard_name :       mole_fraction_of_ozone_in_air
>>> long_name :   Ozone mixing ratio
>>> comment :     Measured by MOZAIC package
>>> units :       0.000000001
>>> missing_value :       -9999
>>> _FillValue :  -9999
>>> scale_factor :         1
>>> availability :         0
>>> (0)     -9999
>>> (0)     min/max var = -9999/-9999
>>> fatal:MeshScalarFieldInitialize: Insufficient number of elements
>> in
>>> sfDataArray
>>> fatal:Unable to initialize layer-Can't Create
>>> fatal:Unable to access object with id:-4
>>> fatal:Unable to access object with id:-4
>>> warning:Unable to add DataItem "(null)" to DataList
>> "cnScalarFieldData"
>>> fatal:CompileDataList:DataList has no valid members
>>> warning:ContourPlotSetValues: cnLevelSpacingF value causes level
>> count to
>>> exceed maximum: using AUTOMATICLEVELS mode
>>> ncl 48>
>>> 
>>> Thank you
>>> 
>>> Najib
>>> 
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> 
> 
> 
> Links:
> ------
> [1] http://2013101819404151.nc
> [2] http://mailman.ucar.edu/mailman/listinfo/ncl-talk

   Thank you sir David and Dennis.

    Got it. Thank you

    Najib