Hello-
We are using the following vertical datum identifiers in the IOOS (Integrated
Ocean Observing System) program. Two are URNs in the OGC namespace (from the
EPSG database); the others are currently in the experimental 'x-noaa'
namespace but we would like to transition them to an 'ioos' namespace.
Vertical datum URNs:
North Am. Vert. Datum (NAVD88) urn:ogc:def:datum:epsg::5103
Free surface of water urn:ogc:def:datum:epsg::5113
Mean Sea Level (MSL) urn:x-noaa:def:datum:noaa::MSL
Intl Great Lakes Datum (IGLD) urn:x-noaa:def:datum:noaa::IGLD
Mean High Water (MHW) urn:x-noaa:def:datum:noaa::MHW
Mean Lower Low Water (MLLW) urn:x-noaa:def:datum:noaa::MLLW
Station Datum (STND) urn:x-noaa:def:datum:noaa::STND
Regards,
Jeff DLB
--
Jeff de La Beaujardière, PhD
U.S. National Oceanic and Atmospheric Administration (NOAA)
Sr Systems Architect, Integrated Ocean Observing System (IOOS) Program Office
1100 Wayne Ave #1225, Silver Spring MD 20910 USA
+1 301 427 2427
[email protected]
On 2011-04-05 15:38, Justin R. Davis wrote:
Does anyone have any specific examples/recommended approaches of how to
specify vertical datums in CF-Compliant NetCDF? I don't see any definitive
explanation of how to do this in any of the documentation. I also see where
people have asked this question in the past, but there never appears to be a
final recommended approach.
Specifically, I'm trying to make sure that its clear that the "z" (bathy/topo)
and "eta" (water level) are being expressed relative to either NGVD29 or
NAVD88...currently the "CF Standard Names" for "sea_surface_height*" mention
only mean water level, geoid or ellipsoid...none of which are really the same
as NGVD29/NAVD88...and the "depth" standard name has no other variants which
look appropriate.
Previous discussion on this topic include approaches of creating a new
standard names (e.g. water_surface_height_above_reference_datum), adding a new
piece of metadata (e.g. reference=NAVD88)...but none of these have made it
into the "CF standard name" document or the CF v1.x Conventions.
Is there a specific recommended approach? If not, is someone working
on this?
thx,
jrd
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Justin R. Davis, Ph.D.
[email protected]
Research Assistant Scientist
Department of Civil and Coastal Engineering
365 Weil Hall / P.O. Box 116580
University of Florida
Gainesville, FL 32611-6580
Office: 352-392-9537 x1528, Weil Hall Room #551
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