[gradsusr] area average method

[Satyaban BishoyiRatna]

Dear Hernán Sala,
I missed 'a' during typing for 'aave' in the second method.
In both the methodology working for 'area average' but which method we should follow. I think the first method will use the map scale factor for calculate area average. Is it really required or 'aave' command will be enough ?
I didn't find any document to use map scale factor for area average calculation.

Thanks.
Satyaban

On Tue, 17 Aug 2010 05:36:19 +0530  wrote
>Dear Satyaban:
I suggest you to see the function aave. You will find more information in:
http://www.iges.org/grads/gadoc/gadocindex
I have used it, for instance, with temperatures from NCEP reanalysis model.


Regards,
Hernán Sala
Instituto Antártico Argentino



2010/8/16 Satyaban BishoyiRatna 



Dear User,

I saw some script, where people follow  two method to calculate the area average value of a specific parameter.



First method is:

'tmp1=ave(tmp*cos(lat*(3.14/180.)),lat=5,lat=50)'

'tmp2=ave(tmp1,lon=40,lon=120)'

'd tmp2'



Second method is:

'tmp1=ave(tmp,lon=60,lon=100,lat=7,lat=40)'

'd tmp1'



Which method one should follow and what the difference one should get.



Thanks.

Regards

Satyaban

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Dr. Satyaban Bishoyi Ratna

CDAC, Pune, India



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Dr. Satyaban Bishoyi Ratna
CDAC, Pune, India

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