<html><head><meta http-equiv="Content-Type" content="text/html charset=iso-8859-1"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hmm. I suppose it depends on how these gliders operate, but the wavelength problem was almost entirely my bad.<div><br></div><div>I hadn't fully internalized that all the (science) sensors would be on the surface in the case of the wave glider, but of course. (Duh.) I thought there were also some gliders that always porpoise up to the sea surface on every cycle, for power and communications. I hope I am not making that up, but anyway, that's what I thought of when I saw surface glider.</div><div><br></div><div>I think it would be best if the definitions were specific about what we wanted to constrain. So if you want to constrain the trajectory to 2D (I don't know of such that work below the surface, but it could certainly happen), I'd call them 2D gliders or level gliders or some such, and define them as "platform with buoyancy-based propulsion that nominally confines its sensors' vertical location to a single depth"; if you want to constrain it to surface, then replace "a single depth" with "the sea surface", in which case calling it surface glider makes perfect sense. (To any normal person. ;->)</div><div><br></div><div>yes, now that you define drogue for me I recall that application. Interesting that it didn't surface (so to speak) in Google. It is common, you're right, but I think your clarification helps.</div><div><br></div><div>john</div><div><br></div><div><br></div><div><br></div><div><br><div><div>On Aug 12, 2013, at 06:52, Nan Galbraith <<a href="mailto:ngalbraith@whoi.edu">ngalbraith@whoi.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<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><tt></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></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>
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On 8/12/13 3:30 AM, Lowry, Roy K. wrote:<br>
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<div style="font-size: x-small; font-family: Tahoma; direction: ltr; " danaprelude="1">
<div>Should have replied to the list, not just John....</div>
<div dir="ltr"> </div>
<div id="divRpF170072" style="DIRECTION: ltr">
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<font 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; 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 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
John Graybeal [<a 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 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>
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<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> </div>
<div> </div>
<div> </div>
<div>Please note that I now work part-time
from Tuesday to Thursday. E-mail response
on other days is possible but not
guaranteed!</div>
<div> </div>
<div> </div>
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* Nan Galbraith Information Systems Specialist *
* Upper Ocean Processes Group Mail Stop 29 *
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