[ecco-support] Question on tracer cell area calculation

[范文蓝]

Hi, ecco team,

Thank you again for your previous help in reading grid files; I have a follow-up question.

According to grid variable documentation, I expected the horizontal area of every tracer cell to be

    rA = dxG * dyG.

However, after loading the variables from the grid file, the equality does not hold for any cell. 

Does this mean that simply multiplying dxG by dyG is insufficient, and additional corrections (e.g., spherical-geometry factors) are still needed to obtain the true rA? 
If so, is reading rA directly the more accurate way to get the cell area?

Thank you very much for your help.

Best regards,  

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范 文 蓝

Wenlan Fan, Ph.D Candidate
GNSS Research Center, Wuhan University
Wuhan, 430079, P. R. China
(+86)15708408018
fwl at whu.edu.cn

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