| Identifier |
PrefLabel |
Definition |
Date |
| S2000024 |
1 micropascal |
The reference level is a pressure of 1 micropascal. |
2019-10-14 |
| S2000022 |
1900-01-01T00:00:00Z |
The time reference is midnight UTC on the 1st January 1900. |
2019-03-26 |
| S2000018 |
1950-01-01T00:00:00Z |
The time reference is midnight UTC on the 1st January 1950. |
2019-03-26 |
| S2000019 |
1970-01-01T00:00:00Z |
The time reference is midnight UTC on the 1st January 1970. |
2019-03-26 |
| S2000017 |
Irish Grid Reference System |
A geographic grid reference system used in Ireland based on 1965 Datum and the Airy Modified Ellipsoid. |
2019-02-01 |
| S2000016 |
OSGB36 |
The Ordnance Survey Great Britain 1936 datum based on the Airy 1830 ellipsoid. |
2019-02-01 |
| S2000002 |
True North |
The entity is defined relative to the direction towards the geographic North Pole. |
2018-09-07 |
| S2000015 |
WGS84 |
The World Geodetic System 1984 datum. |
2019-01-22 |
| S2000009 |
averaged sea level |
The entity is defined relative to the sea surface elevation averaged over the duration of the observation. |
2018-09-27 |
| S2000006 |
bed surface |
The entity is defined relative to the surface of the bed of a water body. |
2018-09-07 |
| S2000011 |
ground surface |
The entity is defined relative to the solid surface of the earth. |
2018-09-27 |
| S2000010 |
instantaneous sea level |
The entity is defined relative to the sea surface elevation at the time of the observation. |
2018-09-27 |
| S2000023 |
last reading set |
The reference is the time of the last reading set. |
2019-03-26 |
| S2000012 |
magnetic north |
The entity is defined relative to the direction indicated by a magnetic needle or compass. |
2018-09-28 |
| S2000008 |
mean sea level |
The entity is defined relative to the sea surface elevation averaged over a long period of time which approximates to the Earth's geoid. |
2018-09-27 |
| S2000013 |
moving platform |
The entity is defined relative to the platform from which the measurement is made. |
2018-10-01 |
| S2000004 |
moving platform and True North |
The entity is defined relative to the moving platform (e.g. a ship) for speed and True North for direction. |
2018-09-07 |
| S2000003 |
moving platform and heading |
The entity is defined relative to the moving platform (e.g. a ship). |
2018-09-07 |
| S2000001 |
not applicable |
This semantic element is not required for the parameter being described. |
2017-06-15 |
| S2000007 |
sea level |
The entity is defined relative to the sea surface elevation averaged over a period long enough to eliminate tidal signals. |
2018-09-27 |
| S2000020 |
start of day 00:00:00 UT |
The time reference is midnight UTC at the start of the day. |
2019-03-26 |
| S2000021 |
start of dive |
The reference is the start of the platform dive. |
2019-03-26 |
| S2000014 |
water |
The measurement is defined relative to the water as in, for example, speed through water. |
2018-10-02 |
| S2000005 |
water surface |
The entity is defined relative to the surface of a water body. |
2018-09-07 |
