[ferret_users] Spatial average from multiple files;

Hi,

I tried to derive spatial average of KD490 from four different files (1.nc, 2.nc, 3.nc and 4.ncdownloaded from giovanni database)

\\I used the following stpes

yes? use 1.nc , 2.nc , 3.nc , 4.nc

yes? sh da

currently SET data sets:

1> ./1.nc

name title I J K L M N

MODISA_L3M_KD_2014_KD_490

Diffuse attenuation coefficient 1:156 1:96 ... ... ... ...

2> ./2.nc

name title I J K L M N

MODISA_L3M_KD_2014_KD_490

Diffuse attenuation coefficient 1:156 1:96 ... ... ... ...

3> ./3.nc

name title I J K L M N

MODISA_L3M_KD_2014_KD_490

Diffuse attenuation coefficient 1:156 1:96 ... ... ... ...

4> ./4.nc (default)

name title I J K L M N

MODISA_L3M_KD_2014_KD_490

Diffuse attenuation coefficient 1:156 1:96 ... ... ... ...

yes? fill MODISA_L3M_KD_2014_KD_490[d=1]

yes? frame/file=Figure1.gif //Figure1 in the attachement

yes? fill MODISA_L3M_KD_2014_KD_490[d=2]

yes? frame/file=Figure2.gif //Figure2 in the attachement

yes? fill MODISA_L3M_KD_2014_KD_490[d=3]

yes? frame/file=Figure3.gif //Figure3 in the attachement

yes? fill MODISA_L3M_KD_2014_KD_490[d=4]

yes? frame/file=Figure4.gif //Figure4 in the attachement

yes? fill (MODISA_L3M_KD_2014_KD_490[d=1]+MODISA_L3M_KD_2014_KD_490[d=2]+MODISA_L3M_KD_2014_KD_490[d=3]+MODISA_L3M_KD_2014_KD_490[d=4])/4

yes? frame/file=Figure5.gif //Figure5 in the attachement

//In theimage, most of the regions were empty while taking the average (the method read from ferret user group).

//It was because of the missing data in any of the file (eg. 4.nc), ledthe empty regions, though other files having values.

I should take theaverage from these files.

How can I solve this?

Is it possible to replace the 'no data (....)' as 'zero (0)'?

or Is it possible to feed K and L axis with some values like L value = 1,2,3 and 4 for each .nc files,respectively? May it be useful to take average like

"yes? fill MODISA_L3M_KD_2014_KD_490 [l=1:4@AVE]".

The sample data files attached here.

Thanks.

C. Karnan, CSIR - SRF

National Institute of Oceanography (CSIR)

India.