Hi Evan,
The data model in Ferret does not allow for overlapping bounds, nor does
it allow non-contiguous bounds. Those are legal in CF, but Ferret (as I
imagine is the case for most software), does not implement everything in
the standard.
In fact Ferret will not make use of your bounds definition; I believe it
will have ignored the bounds and will instead have defined the grid-cell
edges using the midpoints between axes. Use the command,
show axis/z axis_name
to see what Ferret has done to set up its the internal representation of
the axis.
-Ansley
On 3/3/2017 7:32 AM, Manning, Evan M (398B) wrote:
>
> When I was researching the topic I came across this:
>
> >/When I try and load the file using Ferret, this throws a warning.. Which/
>
> >/makes me think I?m not doing things correctly:/
>
> >//
>
> >/Ferret v6.93/
>
> >/yes? use file.nc/
>
> >/ *** NOTE: Axis definition error on axis: time. Bounds describe
> cells that/
>
> >/overlap one another/
>
> which made me think that overlap was an error. But reading more
> context I see it is just a ?note?, not an ?error?, and clearly
> overlapping bounds are accepted.
>
> For my situation of overlapping vertical trapezoids, I now think I
> should use the full overlapping extent in the ?bounds? variable and
> explain the full shape of the trapezoids in the main variable?s
> description attribute.
>
> Is there a better way to communicate the full situation?
>
> -- Evan
>
> *From: *Jim Biard <jbiard at cicsnc.org>
> *Date: *Friday, March 3, 2017 at 5:09 AM
> *To: *<cf-metadata at cgd.ucar.edu>
> *Subject: *Re: [CF-metadata] Overlapping vertical bounds
>
> What makes you think overlapping bounds are illegal?
>
> On 3/2/17 7:20 PM, Manning, Evan M (398B) wrote:
>
> I have some quantities which are defined on trapezoids in the
> vertical direction.
>
> For example the top trap might be full weight from the top of the
> atmosphere (TOA) to 50 hPa, then we ramp linearly between the
> first and second traps between 50 & 75 hPa, then trap 2 is full
> weight 75-100 hPa, followed by another transition in [100, 125]
> hPa, etc.
>
> I can?t have a bounds variable with the full extent of each trap
> like [ [0, 75], [50, 125], [100, ? because overlap is illegal.
>
> I could have underlap, just giving the intervals where each trap
> is in full force: [ [0, 50], [75, 100], ?
>
> Or I could use the midpoints of the transitions: [ [ 0, 62.5],
> [62.5, 112.5], ?
>
> I?d prefer to find a standard way to communicate the precise
> situation. Is there one?
>
> -- Evan
>
>
>
>
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Received on Fri Mar 03 2017 - 16:59:47 GMT
