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This dataset was last updated on LINZ Data Service on 30 Jan 2017.
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Toitū Te Whenua Land Information New Zealand
Chief Geodesist - National Geodetic Office
04 4600110
155 The Terrace
Wellington
6011
New Zealand
customersupport@linz.govt.nz
resourceProvider
2017-02-03
ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
1.1
4167
NZ Airborne Gravity Free-Air Anomalies at Ground Surface (2013-2014)
**Introduction**
This dataset provides a 1 arc minute raster image of the free-air gravity anomalies, which have been downward continued to the ground surface (McCubbine et al, 2017).
**Description**
Gravity anomalies are differences between measured gravity (from the airborne gravity dataset) and an ellipsoidal model of the Earth’s gravity field (GRS80). Gravity anomalies correspond to un-modelled density variations within the Earth’s crust and upper mantle. They are used to investigate concealed geological structures and for quasigeoid modelling.
These free-air anomalies show values which include gravitation impact of the topography.
The national airborne gravity dataset is comprised of more than 50,000 linear km of flight observations, covering the three main islands of New Zealand and up to 10km offshore.
As the airborne gravity dataset was measured at flight altitude, the observations have been reduced to the ground surface (a process known as downward continuation).
The national airborne gravity dataset was collected as a joint project between Toitū Te Whenua Land Information New Zealand (LINZ), GNS Science (GNS) and Victoria University of Wellington (VUW). The airborne survey was completed in a total of eight months, over two campaigns: August – October 2013, and February – June 2014.
**Users may also be interested other layers created for Bouguer anomalies at ground surface and the along track observations from the gravity flight lines at flight elevation** [NZ Airborne Gravity Bouguer Anomalies at Ground Surface (2013-2014)](https://data.linz.govt.nz/layer/3530) and [NZ Airborne Gravity Flight Lines at Elevation (2013-2014)](https://data.linz.govt.nz/layer/3531).
McCubbine, J. Stagpoole, V. Caratori-Tontini, F. Amos, M. Smith, E. and Winefield, R. (2017). Gravity anomaly grids for the New Zealand region. Manuscript submitted for publication New Zealand Journal of Geology and Geophysics.
Purpose of this dataset is to supply the national airborne gravity dataset for use in geophysical research and mapping.
GNS Science
Victoria University of Wellington
Toitū Te Whenua Land Information New Zealand
completed
Omit
Toitū Te Whenua Land Information New Zealand
Chief Geodesist - National Geodetic Office
0800 665 463 or +64 4 460 0110
+64 4 472 2244
155 The Terrace
Wellington
6011
New Zealand
customersupport@linz.govt.nz
pointOfContact
omit
Toitū Te Whenua Land Information New Zealand
Chief Geodesist - National Geodetic Office
04 4600110
155 The Terrace
Wellington
6011
New Zealand
customersupport@linz.govt.nz
resourceProvider
monthly
*.xml
Unknown
New Zealand
theme
ANZLIC Jurisdictions
Version 2.1
2008-10-29
http://asdd.ga.gov.au/asdd/profileinfo/anzlic-jurisdic.xml#anzlic-jurisdic
ANZLIC the Spatial Information Council
custodian
GEOSCIENCES-Geophysics
LAND-Geodesy
theme
ANZLIC Search Words
Version 2.1
2008-05-16
http://asdd.ga.gov.au/asdd/profileinfo/anzlic-theme.xml#anzlic-theme
ANZLIC the Spatial Information Council
custodian
unclassified
Copyright 2016 Crown copyright (c)
Toitū Te Whenua Land Information New Zealand and the New Zealand Government.
All rights reserved
copyright
Released under Creative Commons Attribution 4.0 International with:
Following Attribution:
If you publish, distribute or otherwise disseminate this work to the public without adapting it, the following attribution to Toitū Te Whenua Land Information New Zealand should be used.'CC BY 4.0 Toitū Te Whenua Land Information New Zealand'
If you adapt this work in any way or include it in a collection, and publish, distribute or otherwise disseminate that adaptation or collection to the public, the following attribution to Toitū Te Whenua Land Information New Zealand should be used.'Contains data sourced from the LINZ Data Service and licensed for reuse under CC BY 4.0.'
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license
eng
utf8
geoscientificInformation
ANZMet Lite Country codelist
Version 1.0
2009-03-31
http://asdd.ga.gov.au/asdd/profileinfo/anzlic-country.xml#Country
ANZLIC the Spatial Information Council
custodian
nzl
https://data.linz.govt.nz/layer/53532-nz-airborne-gravity-free-air-anomalies-at-ground-surface-2013-2014/
dataset
dataset
This dataset is comprised of the downward continued free-air anomalies from the national airborne gravity survey. The downward continued process was completed using least squares collocation, a process which grids the dataset while reducing the data observed at elevation to the ground surface.
The airborne survey was observed over a period of eight months, over two campaigns: August – October 2013, and February – June 2014.
unclassified
Copyright 2016 Crown copyright (c)
Toitū Te Whenua Land Information New Zealand and the New Zealand Government.
All rights reserved
copyright
Released under Creative Commons Attribution 4.0 International
license