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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Well worth sharing with the list!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> James Rapaport
[mailto:James.Rapaport@seazone.com] <br>
<b>Sent:</b> 30 June 2010 15:16<br>
<b>To:</b> Lowry, Roy K<br>
<b>Subject:</b> RE: Vertical CRS<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>Hi Roy,</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>Using that code will not break anything. Logically it's incorrect
though because it refers to a coordinate system, rather than a coordinate <em><span
style='font-family:"Verdana","sans-serif"'>reference</span></em> system. The
ISO 19111 definition (ish) of CRS is:</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Coordinate
system that has its position, scale and orientation defined with respect to an
object; this is accomplished through a <a href="about:blank#szsl:0018"><span
style='color:black'>datum</span></a>. In the context of spatial systems, the
object is usually the Earth. However, it could be an object moving relative to
the Earth, for example, an aeroplane carrying an aerial camera.</span><o:p></o:p></p>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>The key thing is that a CRS therefore, contains a definition of the
coordinate system (which could be urn:ogc:def:cs:EPSG::6498) and the datum (in
your case instantaneous sea level).</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>What I propose is that I contact OGP Surveying and Positioning and
enquire about the validity (in a geodetic sense) of the examples I sent you and
enquire more generally about whether such CRSs could be registered. Bear in
mind that the EPSG database is for the Oil and Gas industry - its scope is
national level geodetic parameters (e.g. OS National Grid) and those with a
direct relevance to Oil and Gas. Therefore, there are no guarantees that they
would accept these CRSs.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>A geodetic parameter registry containing marine vertical CRSs is
needed. Would MEDIN fund one? I wonder if there's scope for collaborating with
OGP (EPSG)... Setting up the registry isn't the thing - it's having geodetic
experts on hand to quality control the contents.</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>In the meantime you could do this (see attached XML for full
encoding - example from INSPIRE so not quite MEDIN valid):</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span lang=FR style='font-size:10.0pt;font-family:"Courier New";
color:blue'><</span><span lang=FR style='font-size:10.0pt;font-family:"Courier New";
color:#A31515'>gmd:extent</span><span lang=FR style='font-size:10.0pt;
font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span lang=FR style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gmd:EX_Extent</span><span lang=FR
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span lang=FR style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </span><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'><</span><span style='font-size:10.0pt;font-family:"Courier New";
color:#A31515'>gmd:verticalElement</span><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:EX_VerticalExtent</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:minimumValue</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gco:Real</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>></span><span style='font-size:
10.0pt;font-family:"Courier New"'>42<span style='color:blue'></</span><span
style='color:#A31515'>gco:Real</span><span style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:minimumValue</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:maximumValue</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gco:Real</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>></span><span style='font-size:
10.0pt;font-family:"Courier New"'>94<span style='color:blue'></</span><span
style='color:#A31515'>gco:Real</span><span style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:maximumValue</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:verticalCRS</span><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:VerticalCRS</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><span
style='font-size:10.0pt;font-family:"Courier New";color:red'>gml:id</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>=</span><span
style='font-size:10.0pt;font-family:"Courier New"'>"<span
style='color:blue'>SeaSurfaceDepthCrs</span>"<span style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:identifier</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><span
style='font-size:10.0pt;font-family:"Courier New";color:red'>codeSpace</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>=</span><span
style='font-size:10.0pt;font-family:"Courier New"'>"<span
style='color:blue'>MEDIN</span>"<span style='color:blue'>></span>SeaSurfaceDepthCrs<span
style='color:blue'></</span><span style='color:#A31515'>gml:identifier</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:name</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>></span><span style='font-size:
10.0pt;font-family:"Courier New"'>Sea surface depth<span style='color:blue'></</span><span
style='color:#A31515'>gml:name</span><span style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:remarks</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>></span><span
style='font-size:10.0pt;font-family:"Courier New"'>Depths measured relative to
the sea surface.<span style='color:blue'></</span><span style='color:#A31515'>gml:remarks</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:scope</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>></span><span
style='font-size:10.0pt;font-family:"Courier New"'>Used for oceanographic
surveying.<span style='color:blue'></</span><span style='color:#A31515'>gml:scope</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:verticalCS</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><span
style='font-size:10.0pt;font-family:"Courier New";color:red'>xlink:href</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>=</span><span
style='font-size:10.0pt;font-family:"Courier New"'>"<span
style='color:blue'>urn:ogc:def:cs:EPSG::6498</span>"<span
style='color:blue'>/><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:verticalDatum</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:VerticalDatum</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><span
style='font-size:10.0pt;font-family:"Courier New";color:red'>gml:id</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>=</span><span
style='font-size:10.0pt;font-family:"Courier New"'>"<span
style='color:blue'>SeaSurfaceDatum</span>"<span style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:identifier</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'> </span><span
style='font-size:10.0pt;font-family:"Courier New";color:red'>codeSpace</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>=</span><span
style='font-size:10.0pt;font-family:"Courier New"'>"<span
style='color:blue'>MEDIN</span>"<span style='color:blue'>></span>SeaSurfaceDatum<span
style='color:blue'></</span><span style='color:#A31515'>gml:identifier</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:name</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>></span><span style='font-size:
10.0pt;font-family:"Courier New"'>Sea Surface Datum<span style='color:blue'></</span><span
style='color:#A31515'>gml:name</span><span style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:remarks</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>></span><span
style='font-size:10.0pt;font-family:"Courier New"'>Heights relative to the sea
surface<span style='color:blue'></</span><span style='color:#A31515'>gml:remarks</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:scope</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>></span><span
style='font-size:10.0pt;font-family:"Courier New"'>Oceanographic survey.<span
style='color:blue'></</span><span style='color:#A31515'>gml:scope</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> <</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:anchorDefinition</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>></span><span
style='font-size:10.0pt;font-family:"Courier New"'>Instantaneous position of
the sea surface.<span style='color:blue'></</span><span style='color:#A31515'>gml:anchorDefinition</span><span
style='color:blue'>><o:p></o:p></span></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:VerticalDatum</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:verticalDatum</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;
font-family:"Courier New";color:#A31515'>gml:VerticalCRS</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:verticalCRS</span><span style='font-size:10.0pt;
font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:EX_VerticalExtent</span><span
style='font-size:10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:
"Courier New";color:#A31515'>gmd:verticalElement</span><span style='font-size:
10.0pt;font-family:"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:"Courier New";
color:#A31515'>gmd:EX_Extent</span><span style='font-size:10.0pt;font-family:
"Courier New";color:blue'>><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'> </</span><span style='font-size:10.0pt;font-family:"Courier New";
color:#A31515'>gmd:extent</span><span style='font-size:10.0pt;font-family:"Courier New";
color:blue'>></span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>Cheers,</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>James</span><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
medin_standards-bounces@biwebs1.nerc-liv.ac.uk
[mailto:medin_standards-bounces@biwebs1.nerc-liv.ac.uk] <b>On Behalf Of </b>Lowry,
Roy K<br>
<b>Sent:</b> 30 June 2010 13:04<br>
<b>To:</b> medin_standards@mailman.nerc-liv.ac.uk<br>
<b>Subject:</b> [Medin_standards] FW: Vertical CRS</span><span lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi James,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Thought this should be shared with the list and not just me. The
encodings look OK to me, although these things are way outside my comfort
zone. However, it doesn’t solve my current problem of what I put into
sub-element 14.3 of the MEDIN documents we’re creating. If we could follow
Steve’s suggestion and get these registered with EPSG then that would be
problem solved. Is that possible?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In the meantime, if I populated with urn:ogc:def:cs:EPSG::6498,
which I assume at least specifies that z increases downwards, can you see any
issues?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers, Roy.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> James Rapaport
[mailto:James.Rapaport@seazone.com] <br>
<b>Sent:</b> 29 June 2010 13:41<br>
<b>To:</b> Lowry, Roy K<br>
<b>Subject:</b> RE: Vertical CRS<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>Hi Roy,</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>I can't find anything registered (i.e. in EPSG or otherwise). I've
cooked up a couple of XML files which you should be able to slot into an ISO
19139 record:</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>SeaSurfaceDepthCrs.xml contains a definition of a <strong><span
style='font-family:"Verdana","sans-serif"'>positive down</span></strong> CRS.</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>SeaSurfaceHeightCrs.xml contains a definition of a <strong><span
style='font-family:"Verdana","sans-serif"'>positive up</span></strong><em><b><span
style='font-family:"Verdana","sans-serif"'> </span></b></em>CRS.</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>I <em><span style='font-family:"Verdana","sans-serif"'>think</span></em> they
are ok - at least I think they'll contain enough information suitable for
metadata. What do you think?</span><o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:blue'>James</span><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US>
<hr size=2 width="100%" align=center>
</span></div>
<p class=MsoNormal style='margin-bottom:12.0pt'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
medin_standards-bounces@biwebs1.nerc-liv.ac.uk [mailto:medin_standards-bounces@biwebs1.nerc-liv.ac.uk]
<b>On Behalf Of </b>Lowry, Roy K<br>
<b>Sent:</b> 29 June 2010 10:56<br>
<b>To:</b> medin_standards@mailman.nerc-liv.ac.uk<br>
<b>Subject:</b> [Medin_standards] Vertical CRS</span><span lang=EN-US><o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'>Dear
All,<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'>Does
anybody have any suggestion what the vertical CRS (MEDIN element 14.3) should
be for depths measured relative to an instantaneous sea level (i.e. zero is the
sea surface at the place and time of the measurement)?<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'>Cheers,
Roy.<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p>
</div>
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