[ferret_users] Spatial average from multiple files;

To: ferret_users@xxxxxxxx

Subject: [ferret_users] Spatial average from multiple files;

From: Karnan C <karnanc6@xxxxxxxxx>

Date: Fri, 16 Jun 2017 10:54:29 +0530

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Hi,

I tried to derive spatial average of KD490 from four different files (1.nc, 2.nc, 3.nc and 4.nc downloaded 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 the image, 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), led the empty regions, though other files having values.

I should take the average 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.

Attachment: Figure1.gif
Description: GIF image

Attachment: Figure2.gif
Description: GIF image

Attachment: Figure3.gif
Description: GIF image

Attachment: Figure4.gif
Description: GIF image

Attachment: Figure5.gif
Description: GIF image

Attachment: 1.nc
Description: Cdf file

Attachment: 2.nc
Description: Cdf file

Attachment: 3.nc
Description: Cdf file

Attachment: 4.nc
Description: Cdf file

Attachment: Steps
Description: Binary data