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

[Dennis Shea]

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","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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