[ferret_users] grid compressed after subtract area average

[Xiaoyu Bai <xbai1@xxxxxxxx>]

Dear ferreters,

I noticed that when I subtract area average from a variable, it will make the variable's Lat and Lon become compressed instead of full. For example:

use levi_climatology

let test=TEMP-TEMP[X=@AVE,Y=@AVE]

sh grid TEMP,test
    GRID GMS1
 name       axis              # pts   start                end                 subset
 XAXLEVITR LONGITUDE          360mr   20.5E                19.5E(379.5)        full
 YAXLEVITR LATITUDE           180 r   89.5S                89.5N               full
 ZAXLEVITR DEPTH (m)           20 i-  0                    5000                full
 normal    T
    GRID GMS1
 name       axis              # pts   start                end                 subset
 XAXLEVITR LONGITUDE          360mr   20.5E                19.5E(379.5)        compressed
 YAXLEVITR LATITUDE           180 r   89.5S                89.5N               compressed
 ZAXLEVITR DEPTH (m)           20 i-  0                    5000                full
 normal    T

What I want is to get a less noisy variable, then apply @DIN to it. But this compressed grid was blocking me to use @DIN.

So I am wondering how to get my coordinate to full again.

Thank you in advance.

 

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Xiaoyu