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 I¹m 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 <[email protected]>
*Date: *Friday, March 3, 2017 at 5:09 AM
*To: *<[email protected]>
*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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