11:15 〜 11:30
[G01-6-04] New Zealand Vertical Datum 2016, an improved gravimetric reference frame
In June 2016 the New Zealand Vertical Datum 2016 (NZVD2016) was released. This quasigeoid based datum replaced the NZVD2009 and halved the nominal datum error from 6 cm to 3 cm.
The geoid underpinning NZVD2016 was improved through the acquisition of a nationally consistent airborne gravity dataset, re-analysis of the existing terrestrial database, and inclusion of of more recent satellite gravity data. The impact of each of these datasets is assessed and quantified before incorporation in the reference surface.
NZVD2016 also differs from NZVD2009 in the way that relationships to the 13 historical local vertical datums are managed. To ensure that the national datum is easily usable, NZVD2016 provides relationship surfaces to each local datum to facilitate the migration of data into the new reference frame. The computation and error characteristics of these surfaces are discussed, along with an analysis of the datum's performance in recent large earthquakes in New Zealand.
The geoid underpinning NZVD2016 was improved through the acquisition of a nationally consistent airborne gravity dataset, re-analysis of the existing terrestrial database, and inclusion of of more recent satellite gravity data. The impact of each of these datasets is assessed and quantified before incorporation in the reference surface.
NZVD2016 also differs from NZVD2009 in the way that relationships to the 13 historical local vertical datums are managed. To ensure that the national datum is easily usable, NZVD2016 provides relationship surfaces to each local datum to facilitate the migration of data into the new reference frame. The computation and error characteristics of these surfaces are discussed, along with an analysis of the datum's performance in recent large earthquakes in New Zealand.