New orders for coordinates in Landonline
Orders used to describe the accuracy of coordinates in Landonline were updated in conjunction with the implementation of the Rules for Cadastral Survey 2010, Landonline Release 3.4 and LINZS25005 and LINZS25006 standards.
The most noticeable change was the replacement of orders 7(i), 7(ii) and 7(iii) with orders 7, 8 and 9. Each order now includes both a network and local accuracy component, whereas previously these were not defined for all orders.
Accuracy tolerances for most orders have been updated to reflect the requirements of the 2010 Rules.
The new accuracy classification methods and changes to the coordinate orders are described in the Coordinate accuracy LINZG25706 fact sheet, and in the Coordinate & Height Accuracy section of LINZ website.
Transforming heights with NZVD2009
Heights recorded in terms of one of the 13 local levelling datums can be transformed to New Zealand Vertical Datum 2009 (NZVD2009) using the NZGeoid2009 and a datum-specific offset. GNSS derived ellipsoidal heights can be transformed to NZVD2009 with the NZGeoid2009 surface alone.
NZVD2009 is the official vertical datum that covers all of New Zealand. It is based on the NZGeoid2009 geoid surface, unlike most vertical datums that are based on the mean sea level. NZVD2009 provides a nationally consistent height reference surface that enables the efficient integration of geospatial datasets.
NZVD2009 and transformation of heights are described in the New Zealand Vertical Datum 2009 - LINZG25705 fact sheet, and on the New Zealand Vertical Datum 2009 page of the LINZ website.
