Ordnance Datum Newlyn
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Ordnance Datum Newlyn Open
Datum Details [VALID]
Name: Ordnance Datum Newlyn
Code: 5101
Type: vertical
Usage:
Usage Details
Scope: Geodesy, topographic mapping.
Extent:

Origin: Mean Sea Level at Newlyn between 1915 and 1921. Initially realised through 1921 and then 1956 levelling network adjustments. From 2002 redefined to be realised through OSGM geoid models.
Conventional Reference System:
Realisation Method:
Publication Date: 1956