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<div class="moz-cite-prefix">Hi Roy -<br>
<br>
That's good. The trajectory's dimensions can't necessarily be
inferred from<br>
the instrument for sub-surface gliders, but can be for surface
gliders, is that <br>
going to be a problem?<br>
<br>
<b><tt>27- sub-surface gliders- platform with buoyancy-based
propulsion that <br>
</tt></b><b><tt><font face="tahoma">is capable of
operation at depths significantly below the surface</font></tt></b><br>
<b><tt>3C- surface gliders- platform with buoyancy-based
propulsion that </tt></b><b>operates <br>
at a single depth near the sea surface</b><tt><br>
</tt><br>
- Nan<br>
<br>
On 8/12/13 10:14 AM, Lowry, Roy K. wrote:<br>
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#000000; DIRECTION: ltr" danaprelude="1">
<div>Hi Nan,</div>
<div> </div>
<div><font face="tahoma">Is the way of getting around this to
phrase it along the lines of 'is capable of operation at
depths significantly below the surface'?</font></div>
<div> </div>
<div><font face="tahoma">Cheers, Roy.</font></div>
<div dir="ltr"> </div>
<div id="divRpF717177" style="DIRECTION: ltr">
<hr tabindex="-1">
<font color="#000000" face="Tahoma" size="2"><b>From:</b>
<a class="moz-txt-link-abbreviated" href="mailto:seavox-bounces@mailman.nerc-liv.ac.uk">seavox-bounces@mailman.nerc-liv.ac.uk</a>
[<a class="moz-txt-link-abbreviated" href="mailto:seavox-bounces@mailman.nerc-liv.ac.uk">seavox-bounces@mailman.nerc-liv.ac.uk</a>] On Behalf Of Nan
Galbraith [<a class="moz-txt-link-abbreviated" href="mailto:ngalbraith@whoi.edu">ngalbraith@whoi.edu</a>]<br>
<b>Sent:</b> 12 August 2013 14:52<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:seavox@mailman.nerc-liv.ac.uk">seavox@mailman.nerc-liv.ac.uk</a><br>
<b>Subject:</b> Re: [Seavox] FW: L06 extensions<br>
</font><br>
</div>
<div>
<div class="moz-cite-prefix">Hi Roy and John - <br>
<br>
One comment on 27 - aren't there subsurface gliders that
operate at one depth - or
<br>
that are sometimes operated at one depth? And, since they
are also free to surface,<br>
occasionally, could you use 'at variable depths' instead of<font
face="tahoma"> 'at variable depths significantly
<br>
below the surface' </font>'? <br>
<br>
And for 3c, instead of 'that is confined to operation on the
sea surface' could you use<br>
'that operates at a single depth near the sea surface'?<br>
<br>
I found it easier if I put the additions in context with
related L06 terms, below, because<br>
then I could see how these fit into the vocabulary.<br>
<br>
<tt>25- autonomous underwater vehicle- free-roving platform
operating in the water column with
</tt><tt><br>
</tt><tt> propulsion but no human operator on board
(e.g. Autosub, Glider). <br>
</tt><b><tt>27- sub-surface gliders- platform with
buoyancy-based propulsion that is able to
<br>
operate within the water column. </tt></b><tt><br>
</tt><tt>3B- autonomous surface water vehicle-
self-propelled vehicle operating on the sea</tt><tt><br>
</tt><tt> </tt><tt><tt>surface with no </tt>human
occupants. <br>
</tt><b><tt>3C- surface gliders- platform with
buoyancy-based propulsion that is confined
<br>
to operation on the sea surface. </tt></b><tt><br>
</tt><tt>42- drifting surface float- unmanned instrumented
platform operating on the
<br>
surface of the </tt><tt>water column often attached to
a drogue to track currents
<br>
rather than winds (e.g. Argos buoy). </tt><tt><br>
</tt><tt>44- drifting subsurface float- unmanned
instrumented platform drifting freely
<br>
in the water column at a depth governed by its density
(e.g. Swallow float)
</tt><tt><br>
</tt><tt>46- drifting subsurface profiling float- unmanned
instrumented platform drifting
<br>
freely in the water column that periodically makes
vertical traverses <br>
through the water column (e.g. Argo float</tt><tt>)</tt><tt><br>
</tt><tt>47- float- free-floating platform either on the
surface of the water column
<br>
or at a predetermined depth within the water column. </tt><tt><br>
</tt><br>
<br>
Cheers - Nan<br>
<br>
<br>
<br>
<br>
<br>
<br>
On 8/12/13 3:30 AM, Lowry, Roy K. wrote:<br>
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#000000; DIRECTION: ltr">
<div>Should have replied to the list, not just John....</div>
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<div id="divRpF170072" style="DIRECTION: ltr">
<hr tabindex="-1">
<font color="#000000" face="Tahoma" size="2"><b>From:</b>
Lowry, Roy K.<br>
<b>Sent:</b> 12 August 2013 08:19<br>
<b>To:</b> John Graybeal<br>
<b>Subject:</b> RE: [Seavox] L06 extensions<br>
</font><br>
</div>
<div>
<div style="FONT-SIZE: x-small; FONT-FAMILY: Tahoma;
COLOR: #000000; DIRECTION: ltr">
<div>Hi John,</div>
<div> </div>
<div><font face="tahoma">I think we're on different
wavelengths regarding the gliders. What I'm
trying to distinguish - following your initial
suggestion - are gliders whose spatio-temporal
feature type may be reasonably be considered a 2D
trajectory (i.e. having a single nominal depth in
metadata works) from those where the feature type
needs to be a 3D trajectory (i.e. the data make no
sense without a depth co-ordinate variable). You
obviously didn't get this from my definitions. The
need to surface didn't come into it. If I replace
'within the water column' by 'at variable depths
significantly below the surface' does that make it
clearer?</font></div>
<div> </div>
<div><font face="tahoma">A drogue is an underwater
parachute attached at a depth of around 40m to
surface drifting buoys to encourage them to follow
the motion of the water rather than the surface
winds. I considered this to be a well-known term
- it's certainly well used by people I know.
Admittedly 'undrogued' is an adaptation of the
word that won't be found in the Oxford English
Dictionary, but it is creeping into common usage
in the operational oceanography community.
According to JCOMMOPS it is critical to the
definition. I'll clarify by adding '(no
underwater parachute)' unless anybody else
objects.</font></div>
<div> </div>
<div><font face="tahoma">I inherited the sea ice
definitions (via Mathieu at JCOMMOPS) from
</font><font face="Arial">The Canadian Ice Service
of Environment Canada, but rephrased them slightly
- possibly not very well. Can anybody provide me
with improved wording?</font></div>
<div> </div>
<div><font face="arial">Cheers, Roy.</font></div>
<div dir="ltr"> </div>
<div id="divRpF167911" style="DIRECTION: ltr">
<hr tabindex="-1">
<font color="#000000" face="Tahoma" size="2"><b>From:</b>
<a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:seavox-bounces@mailman.nerc-liv.ac.uk">
seavox-bounces@mailman.nerc-liv.ac.uk</a> [<a
moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:seavox-bounces@mailman.nerc-liv.ac.uk">seavox-bounces@mailman.nerc-liv.ac.uk</a>]
On Behalf Of John Graybeal [<a
moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:jbgraybeal@mindspring.com">jbgraybeal@mindspring.com</a>]<br>
<b>Sent:</b> 09 August 2013 16:59<br>
<b>To:</b> <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:seavox@mailman.nerc-liv.ac.uk">
seavox@mailman.nerc-liv.ac.uk</a><br>
<b>Subject:</b> Re: [Seavox] L06 extensions<br>
</font><br>
</div>
<div>A few thoughts.
<div><br>
</div>
<div>3C and 27 are difficult to distinguish. No
gliders are exclusively on the sea surface, if by
'glider' we mean a system that uses buoyancy to
initiate forward motion. They are all able to
operate within the water column. So I might say</div>
<div>3C: A platform with buoyancy-based propulsion
that routinely surfaces to meet its objectives. </div>
<div>27: A platform with buoyancy-based propulsion
that can routinely meet its mission objectives
without surfacing.</div>
<div>These are then mutually exclusive.</div>
<div><br>
</div>
<div>49: The term 'undrogued' is unfamiliar to me,
and to my 3 buddies with ocean background. Looking
it up seems to product multiple definitions. Any
chance we could be more specific? Or perhaps it
isn't critical to the definition?</div>
<div><br>
</div>
<div>93/94: 'covering over/under 70% of the sea
surface' -- at what scale is this metric assessed?
I assume we don't mean of the _entire_ sea
surface, but we don't mean of the sea surface
within 1 meter, either. </div>
<div><br>
</div>
<div>John</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
<div><br>
</div>
<div><br>
<div>
<div>On Aug 1, 2013, at 05:49, "Lowry, Roy K."
<<a moz-do-not-send="true"
href="mailto:rkl@bodc.ac.uk">rkl@bodc.ac.uk</a>>
wrote:</div>
<br class="Apple-interchange-newline">
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<div><font face="Calibri, sans-serif"
size="2">
<div>Dear All,</div>
<div> </div>
<div>Discussions on this have gone
quiet, so I'll summarise what has been
said into a proposal for change:</div>
<div> </div>
<div>New codes:</div>
<div> </div>
<div>CODE: 3C</div>
<div>Preferred Label: surface gliders</div>
<div>Definition: A platform with
buoyancy-based propulsion that is
confined to operation on the sea
surface.</div>
<div>Mapping: broadMatch to surface
autonomous vehicle</div>
<div> </div>
<div>CODE: 27</div>
<div>Preferred Label: sub-surface
gliders</div>
<div>Definition: A platform with
buoyancy-based propulsion that is able
to operate within the water column.</div>
<div>Mapping: broadMatch to autonomous
underwater vehicle</div>
<div> </div>
<div>CODE: 49</div>
<div>Preferred Label: surface ice buoy</div>
<div>Definition: An undrogued surface
float that is deployed in regions
where sea ice forms that moves with
either ice or water depending upon the
time of year.</div>
<div>Mapping: broadMatch drifting
surface float</div>
<div> </div>
<div>CODE: 93</div>
<div>Preferred Label: pack ice</div>
<div>Definition: Sea ice not connected
to land covering over 70% of the sea
surface.</div>
<div>Mapping: broadMatch cryosphere</div>
<div> </div>
<div>CODE: 94</div>
<div>Preferred Label: drift ice</div>
<div>Definition: Sea ice not connected
to land covering under 70% of the sea
surface.</div>
<div>Mapping: broadMatch cryosphere</div>
<div> </div>
<div>If there are no further comments
I'll add these records to the
vocabulary when I return from leave on
August 20<font size="1"><sup>th</sup></font>.</div>
<div> </div>
<div>Cheers, Roy.</div>
<div><br>
</div>
</font></div>
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<pre class="moz-signature" cols="72">--
*******************************************************
* Nan Galbraith Information Systems Specialist *
* Upper Ocean Processes Group Mail Stop 29 *
* Woods Hole Oceanographic Institution *
* Woods Hole, MA 02543 (508) 289-2444 *
*******************************************************
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