I have no concern about whether this stream needs labeling. My concern
is whether you are defining something in the definition which is in no
way described by the label, and which will prevent that label being
used for other variables in other streams.
Put another way, what should the models that calculate the nominal
sea_floor_depth_below_sea_surface -- or an averaged value longer than
1 hour -- call their values?
John
On Jan 27, 2010, at 12:54, Lowry, Roy K wrote:
Hi John,
Simple pragmatism. It's what a BPR data stream tends to contain and
so it needs labelling.
Cheers, Roy.
________________________________________
From: John Graybeal [[email protected]]
Sent: 27 January 2010 16:41
To: Lowry, Roy K
Cc: Jeff deLaBeaujardiere; [email protected]; Mike Garcia
Subject: Re: [CF-metadata] seeking CF name for total water column
height
Any particular reason that you are biased for this name representing
only a short-term value? Seems to me there is equally the need for a
(measured or modeled) value that would be defined exactly the same
way, but without the time qualifiers.
In general, when CF has a measured observable, the name makes no
statement about whether the variable has been measured
instantaneously, or for 1 hour, or for one month. It's time-neutral.
This has several advantages.
I suggest either the same principle be applied here, or that the
possibility of the longer-time-frame name be accommodated by adding a
qualifier to the name associated with this definition.
John
On Jan 27, 2010, at 00:58, Lowry, Roy K wrote:
Dear All,
I think a new Standard Name 'sea_floor_depth_below_sea_surface' is
what's needed here. My definition for this would be 'The vertical
distance between the sea surface and the seabed at a given point in
space and at a given instant in time or averaged over a time
interval that is significantly less than a tidal cycle (1 hour or
less).' This may seem complicated, but is needed to cover BPRs which
do some averaging to smooth out waves. My take on
'height_above_sea_floor' would be as the z co-ordinate for something
inside a water body.
May be worth pointing out to Jeff that there is already
'sea_water_pressure_at_sea_floor' for BPR data that haven't been
converted to depth.
I've expressed this as a depth rather than as a height to be
consistent with 'sea_floor_depth_below_sea_level' and so we don't
end up with different terms for the same quantity depending upon
whether one is looking upwards or downwards.
Cheers, Roy.
-----Original Message-----
From: [email protected] [mailto:[email protected]
] On Behalf Of Jeff deLaBeaujardiere
Sent: 26 January 2010 22:22
To: [email protected]
Cc: Mike Garcia
Subject: [CF-metadata] seeking CF name for total water column height
Hello-
I am a new subscriber. We are hoping to adopt CF names wherever
possible in the context of the Integrated Ocean Observing System
(IOOS) Sensor Observation Services (SOS). Not all phenomena we
measure have immediately apparent CF names, however. We are using
this URL as a reference:
http://cf-pcmdi.llnl.gov/documents/cf-standard-names/standard-name-table/current/cf-standard-name-table.html
The first example is total water column height as derived from a
bottom pressure recorder associated with a tsunami warning buoy.
This is not sea_surface_height_above_reference_ellipsoid or
_above_sea_level. It might be height_above_sea_floor but we're not
really sure what that refers to (height of what?).
Is there a standard name present or planned that is equivalent to
total_water_column_height?
Thanks for any information,
Jeff DLB
--
Jeff de La Beaujardière, PhD
Senior Systems Architect, Data Integration Framework
Integrated Ocean Observing System (IOOS) Program Office
National Oceanic and Atmospheric Administration
1100 Wayne Ave #1225, Silver Spring MD 20910 USA
+1 301 427 2427
[email protected]
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--------------
John Graybeal <mailto:[email protected]>
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System Development Manager
Ocean Observatories Initiative Cyberinfrastructure Project:
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Marine Metadata Interoperability Project: http://marinemetadata.org
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is subject to the Freedom of Information Act 2000 and the contents
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NERC may be stored in an electronic records management system.
_______________________________________________
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I have my new work email address: [email protected]
--------------
John Graybeal <mailto:[email protected]>
phone: 858-534-2162
System Development Manager
Ocean Observatories Initiative Cyberinfrastructure Project:
http://ci.oceanobservatories.org
Marine Metadata Interoperability Project: http://marinemetadata.org
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