=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 12-Jul-1993
Port Nelson         690/071 RLR(1987) is 10.5m below BM N1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Jan-2003
New data from John Hannah added 17/01/03 which supercedes old data. New data does not have any missing days information. Old data has been backed up.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Jan-2003
New data from John Hannah was for Auckland II, Dunedin II, Lyttelton II and Wellington II.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 17-Oct-2005
There is a new John Hannah paper referring to New Zealand data for Wellington, Dunedin, Lyttelton and Auckland. The reference is: "An updated analysis of long-term sea level change in New Zealand." Geophysical Research Letters, V31, L03307, doi:10.1029/2003GL019166 (2004).
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 01-Oct-2008
Full dataset for Nelson 1984-2007 received from Glen Rowe at LINZ 01/10/08.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 18-Oct-2010
From information received from Glen Rowe at Linz the datum history is as follows: Up to 1994 TGZ was 5.773m below N1 From 1994 TGZ is 5.775m below N1
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 13-Jul-2016
PSMSL has queried the apparent 'jump' in the Nelson dataset between the data for 2012/2013. However, enquiries by LINZ to the cause of this have been inconclusive.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 28-Jun-2018
The Kaikoura earthquake at 23:02 on 13th November 2016 impacted on a number of stations in the central part of New Zealand. Because of this the hourly values for several stations from 14th November 00:00hrs have been adjusted by LINZ. For station Nelson the adjustment is -0.021m.
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 25-Aug-2020
The adjustment due to the Kaikōura earthquake of 2016 has been removed as relative sea level series should include land movement. LINZ now estimate the land movement to be -0.039m
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 23-Aug-2021
A revised copy of the New Zealand data values for Nelson has been received from the data supplier the Land Information New Zealand (LINZ). The revised data begins from 2014. This exercise has been carried out to correct some anomalies with the high frequency data.
Adjustment has also been applied to the data to account for the Kaikoura earthquake by creating a new datum TGZ December 2016 5.736m below benchmark N 1.
Consequently the Metric data has had the effect of Kaikoura removed but the effect of the earthquake is still evident in the RLR data.