[ncl-talk] About formula of build-in function obj_anal_ic?

[Tao Lu]

Dear ncl-talk

I am using  obj_anal_ic function to do objective analysis.

I have one question and one doubt.

One question:
Is there anyone know about the formulation details?

>From Dynamic meteorology_ data assimilation methods-Springer (1981),
successive correction methods
have formula like
[image: Inline image 1]
[image: Inline image 2]
I would like to know weight function used in obj_anal_ic.


One doubt
function obj_anal_ic (
zlon   [*] : numeric,
zlat   [*] : numeric,
z          : numeric,
glon   [*] : numeric,
glat   [*] : numeric,
rscan  [*] : numeric,
option [1] : logical
)

About the option, if it is true the value will be

new_value(n) = blend_wgt(n)*current_estimate + (1-blend_wgt(n))*value(n-1)

if it is set false, the function will run in default mode.

So what does the default mode mean?

Does it mean blend_wgt = 1.0?

Thank you.

Tao

-- 
******************************************************
Tao Lu    (M. Eng)
Laboratory of River Engineering and Hydrology,
Dept. of Civil and Environmental Engineering,
Graduate School of Science and Engineering,
Chuo University

1-13-27,Kasuga,Bunkyo-ku,Tokyo
112-8551, Japan
TEL: 03-3817-1805;   Phone: 070-2188-7509
Email1: hakufu.asano at gmail.com <mail%3Amet.yamos at gmail.com>
Email2: lutao at civil.chuo-u.ac.jp <mail%3Ayamoto at civil.chuo-u.ac.jp>
*****************************************************
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