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Reporter: martin.thomson@andrew.com | Owner: Martin.Thomson@andrew.com
Type: defect | Status: new
Priority: minor | Milestone:
Component: rfc3825bis | Version:
Severity: - | Resolution:
Keywords: crs urn |
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Comment(by martin.thomson@andrew.com):
Text is taken almost verbatim from my 3825bis document:
Datum:
1: WGS84 (Latitude, Longitude, Altitude):
The World Geodesic System 1984 [WGS84] coordinate reference
system.
This datum is identified by the European Petroleum Survey Group
(EPSG)/International Association of Oil & Gas Producers (OGP) with
the code 4979, which in the GML mapping uses the URN
"urn:ogc:def:crs:EPSG::4979".
Without altitude, this datum is identified by the EPSG/OGP code
4326 and the URN "urn:ogc:def:crs:EPSG::4326".
2: NAD83 (Latitude, Longitude) + NAVD88:
This datum uses a combination of the North American Datum 1983
(NAD83) for horizontal (latitude and longitude) values, plus the
North American Vertical Datum of 1988 (NAVD88) vertical datum.
This datum is used for referencing location on land (not near
tidal water) within North America.
NAD83 is identified by the EPSG/OGP code of 4269, which in the GML
mapping uses the URN
"urn:ogc:def:crs:EPSG::4269". NAVD88 is identified by the EPSG/
OGP code of 5703, or the URN "urn:ogc:def:crs:EPSG::5703".
3: NAD83 (Latitude, Longitude) + MLLW:
This datum uses a combination of the North American Datum 1983
(NAD83) for horizontal (latitude and longitude) values, plus the
Mean Lower Low Water (MLLW) vertical datum.
This datum is used for referencing location on or near tidal water
within North America.
NAD83 is identified by the EPSG/OGP code of 4269, which in the GML
mapping uses the URN
"urn:ogc:def:crs:EPSG::4269". MLLW does not have a specific code
or URN.
All hosts MUST support the WGS84 datum (Datum 1).
New datum codes can be registered in the IANA registry (Section xref)
by
a Standards Track RFC. New geodetic coordinate datums MUST be three
dimensional that define both horizontal and vertical components.
--
Ticket URL: <http://trac.tools.ietf.org/wg/geopriv/trac/ticket/7#comment:2>
geopriv <http://tools.ietf.org/geopriv/>
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