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Re: [ferret_users] data from netcdf file automatically reversed

Hi -
I'm glad you found a good answer. Just one more comment. When first opening a dataset, it's worth reading the notes or warnings that Ferret issues, and trying to understand what they're telling you.  I think that you would have seen,
yes? use data.nc
 *** NOTE: Coordinates out of order or missing on axis time_counter at subscript 2
 *** NOTE: A dummy axis of subscripts will be used

yes? show data
     currently SET data sets:
    1> ./data.nc  (default)
 name     title                             I         J         K         L
          Time axis                        ...       ...       ...       1:389
       (invalid coordinate axis)
          total soil and litter carbon     1:1       1:1       1:13      1:389

When invalid coordinate valuse are used, Ferret puts them into a variable and lists it with the notation (invalid coordinate axis). It contains the numbers that were listed in the coordinate variable of the file - sometimes they can be used to create a valid axis using Ferret DEFINE AXIS commands.


On 5/4/2011 12:29 AM, Yue Chao wrote:
Much thanks to Patrick and Hein! Yes, the bad time axis of the file caused this problem.

It seems that replacing the broken time_counter axis by doing "
define axis /t=1:389:1 time_counter" in ferret didn't change the sequence.
I used ncks as suggested by Patrick to remove the time axis before reading it into ferret, and define other time axis as I want, then it's OK.

Again thanks for the help,


2011/5/3 Brockmann Patrick <Patrick.Brockmann@xxxxxx>
I think you should correct the time axis of your file.

time_counter = 15768000, -78926400, 15768000, 15768000, -78926400,
  -15854400, -47390400, -15854400, -110462400, -78926400, -78926400,
  -47390400, -78926400, -15854400, -110462400, 15768000, 15768000,
  -47390400, -110462400, -47390400, ...

is not a correct axis (whatever the reason) because it is neither increasing or decreasing.

You could remove this wrong axis by using ncks (from nco commands)

ncks -Oh -C -x -v time_counter file1.nc file2.nc

ferret will then open your file in the right order and presents it as indices.
Then, define a new axis if needed.


Data Analysis and Visualization Engineer
ICMC - IPSL Climate Modelling Centre

Chao YUE
Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL)
Batiment 712 - Pe 119
91191 GIF Sur YVETTE Cedex
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