Re: Invert Y axis

[Ansley Manke <Ansley.B.Manke@xxxxxxxx>]

Hi Peter and Jaison,
Jaison gives two useful ways to deal with a depth axis, and I want
to point out just one more.  Once you have read in the data, you
can say

    set axis/depth zax_name

where zax_name is the name of the vertical axis.  Then the axis
will be plotted with 0 at the top of the plot, and the effect will last
for the rest of the Ferret session.  If you save variables having this
axis to a NetCDF file, the definition of the axis as a depth axis will
be saved as well.

Ansley Manke

Jaison Kurian wrote:

> Hi Peter,
>            There is a simple solution for your problem. You can use the
> qualifier VLIMITS with the fill or countour command to orient the Y axis
> in the increasing or decreasing order of depth. You will get the
> details in the ferret manual commands reference section.
>
>    use /VLIMITS=y_top value:y_bottom value:increment  with fill or
>    countour command
>
>    example: (here y axis is in the reverse way)
>
>              set data levitus_climatology
>              set reg/y=-80:80/x=230
>              fill temp  !   now Y-axis is positive downward
>              fill /VLIMITS=5000:0:500 temp ! now Y-axis is negative
>                                            !  downward
>    in your case you have to give
>              fill /VLIMITS=0:5000:500 salinity
>
> There is one more way to solve your problem....it is rather a permanent
> solution
>
>  If you can edit the netcdf file, you can change the attribute for
>     depth indicating the positive direction of depth as
>     DEPTH : positive = "down" as positive down.
>     you can use either ncdump & ncgen or fortran/C programs to do this
>
> Best Regards
>
> Jaison Kurian
>
> set the On Wed, 13 Aug 2003, Peter Haster wrote:
>
> > Dear Ferreters,
> > I have a simple problem. My salinity file has a irregular grid in the Z
> > axis. The axis is define as: Depth - start at 0 meters to 5000 meters. When
> > I make a contour or fill plot of a meridional section the depth axis is
> > invert. The top o the axis are 5000 and the bottom are 0 meters. If any one
> > have an idea to invert the axis (y) ?
> >
> > Thanks
> > Peter
> >
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