Re: [ferret_users] grid problem y axis (latitude)

[Ansley manke <ansley.b.manke@xxxxxxxx>]

Hi helle,
I'm working off-line and can't see your image, but I know the issue. What are the units of the latitude axis?  What is the range of the y coordinate values?  Is this a netCDF file?  If so then looking at the y-axis information from a ncdump -c. would tell us if there's more that ferret could do to issue a note or something.

To use the dataset with reversed coordinates, the USE/ORDER qualifier let's you tell ferret to reverse the Y axis.

Ansley

-----Original message-----

From: Hella Riede <hella.riede@xxxxxxx>
To: ferret <oar.pmel.ferret_users@xxxxxxxx>
Sent: Thu, Oct 21, 2010 14:47:37 GMT+00:00
Subject: [ferret_users] grid problem y axis (latitude)

Dear ferreters,

in our default model output, the y axis (latitude) is unconventionally
defined from north to south. Working with the unchanged file in ferret
seems to work fine. But since ferret does not recognize this
unconventional axis/grid correctly, it produces a mirror image of the
data with respect to latitude when for example appending a variable to
the file. This "mirroring" happens without error notice or warning,
which can of course lead to misunderstandings interpreting the data.

I prepared an example, see attachment.

Thank you in advance for taking notice.

Best wishes,
Hella


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Hella Riede (Dipl.Chem.)
Max Planck Institute for Chemistry
Dept. of Atmospheric Chemistry
Becherweg 27 email: hella.riede@xxxxxxx
55128 Mainz phone: +49-6131-305437
Germany fax: +49-6131-305436

homepage: www.mpch-mainz.mpg.de/~riede
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