[Medin_standards] FW: Vertical CRS

[Lowry, Roy K]

Hi James,

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?

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?

Cheers, Roy.

From: James Rapaport [mailto:James.Rapaport at seazone.com]
Sent: 29 June 2010 13:41
To: Lowry, Roy K
Subject: RE: Vertical CRS

Hi Roy,

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:

SeaSurfaceDepthCrs.xml contains a definition of a positive down CRS.

SeaSurfaceHeightCrs.xml contains a definition of a positive up CRS.

I think they are ok - at least I think they'll contain enough information suitable for metadata. What do you think?

James

________________________________
From: medin_standards-bounces at biwebs1.nerc-liv.ac.uk [mailto:medin_standards-bounces at biwebs1.nerc-liv.ac.uk] On Behalf Of Lowry, Roy K
Sent: 29 June 2010 10:56
To: medin_standards at mailman.nerc-liv.ac.uk
Subject: [Medin_standards] Vertical CRS
Dear All,

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)?

Cheers, Roy.

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