[ncl-talk] warning:cnConstFEnableFill to enable fill

[Kunal Bali]

Dear NCL users,

I am trying to calculate the coefficient of divergence using the attached
script. The script is running successfully but I am getting only one value
i.e. 1 as a minimum and maximum value which should come in between 0 to 1.
And because of that I am also receiving the warning such as

warning:ContourPlotInitialize: scalar field is constant; no contour lines
will appear; use cnConstFEnableFill to enable fill
if I set

res at cnConstFEnableFill = True

then the whole field is drawn in a single color as expected it will give
only one color.



Regarding data
The data is in different 5 grid structure covering different Indian region
so I merged them and got one single file which cover whole Indian region
and then runs the attached script.

Before merging the data, I used the same script for different grid
structures separately and it was giving the correct values between 0 to 1.

But this time I am getting only one value.

So could anyone please provide some information on that.




































































































*Copyright (C) 1995-2017 - All Rights Reserved University Corporation for
Atmospheric Research NCAR Command Language Version 6.4.0 The use of this
software is governed by a License Agreement. See http://www.ncl.ucar.edu/
<http://www.ncl.ucar.edu/> for more details.Variable: totcType: doubleTotal
Size: 4050173952 bytes            506271744 valuesNumber of Dimensions:
3Dimensions and sizes:    [time | 96] x [lat | 2112] x [lon |
2497]Coordinates:             time:
[35430.125..104813.7916666667]            lat:
[5.0078125..37.9921875]            lon: [  59..  98]Number Of Attributes:
6  _FillValue :    -28672  long_name :    AOT at 0.55 micron  hdfeos_name
:    Optical_Depth_055  projection :    Albers Conical Equal_Area  unit
:    None  missing_value :    -28672Variable: totcType: doubleTotal Size:
4050173952 bytes            506271744 valuesNumber of Dimensions:
3Dimensions and sizes:    [time | 96] x [lat | 2112] x [lon |
2497]Coordinates:             time:
[35430.125..104813.7916666667]            lat:
[5.0078125..37.9921875]            lon: [  59..  98]Number Of Attributes:
6  _FillValue :    -28672  long_name :    AOT at 0.55 micron  hdfeos_name
:    Optical_Depth_055  projection :    Albers Conical Equal_Area  unit
:    None  missing_value :    -28672Variable: data_subsetType: doubleTotal
Size: 295196160 bytes            36899520 valuesNumber of Dimensions:
3Dimensions and sizes:    [time | 96] x [lat | 646] x [lon |
595]Coordinates:             time:
[35430.125..104813.7916666667]            lat:
[29.5234375..19.4453125]            lon: [91.390625..82.109375]Number Of
Attributes: 6  missing_value :    -28672  unit :    None  projection :
Albers Conical Equal_Area  hdfeos_name :    Optical_Depth_055  long_name
:    AOT at 0.55 micron  _FillValue :    -28672(0)    nearest location:
k=0  n=481 m=882  156.836  5297.11(0)    -----(0)    -----Variable:
CoD1Type: doubleTotal Size: 295196160 bytes            36899520
valuesNumber of Dimensions: 3Dimensions and sizes:    [96] x [646] x
[595]Coordinates: Number Of Attributes: 1  _FillValue :    -28672(0)
min=1   max=1(0)    ---Variable: CoD2Type: doubleTotal Size: 3074960
bytes            384370 valuesNumber of Dimensions: 2Dimensions and
sizes:    [646] x [595]Coordinates: Number Of Attributes: 3  long_name :
Coef of Divergence  _FillValue :    -28672  average_op_ncl :    dim_avg_n
function was applied(0)    Coef of Divergence : min=1   max=1Variable:
CoD_finalType: doubleTotal Size: 3074960 bytes            384370
valuesNumber of Dimensions: 2Dimensions and sizes:    [646] x
[595]Coordinates: Number Of Attributes: 1  _FillValue :    -28672(0)
min=1   max=1warning:ContourPlotInitialize: scalar field is constant; no
contour lines will appear; use cnConstFEnableFill to enable fill*

---
Kunal
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