NZ Geoid 2009
The New Zealand Quasigeoid2009 (NZGeoid2009) can be used to convert GPS derived ellipsoidal heights to New Zealand Vertical Datum 2009 (NZVD2009) normal-orthometric heights that relate more closely to mean sea level and the local gravity field. NZGeoid2009 can also be used to transform heights to any of the 13 official local vertical datums used across New Zealand, more information on this transformation is available at http://www.linz.govt.nz/geodetic/conversion-coordinates/height-conversions .
NZGeoid2009 is formally defined in the LINZ standard LINZS25004 which can be obtained from http://www.linz.govt.nz/geodetic/standards-publications/standards. NZGeoid2009 models the difference between the GRS80 ellipsoid and the geoid over the New Zealand region. The geoid is a theoretical surface of equal gravity that roughly approximates the mean level of the sea across the Earth .
NZGeoid2009 is published by LINZ and was computed by enhancing the EGM2008 global gravity model with terrestrial gravity observations over New Zealand and DNSC08 satellite altimetry data over the oceans. The model is published on a one arc-minute grid covering New Zealand's extended exclusive economic zone.
The accuracy of NZGeoid2009 is nominally ±0.08 metres across New Zealand. More information on the accuracy in relation to the 13 local vertical datums is provided in LINZS25004.
Simple
Identification info
- Date (Publication)
- 2009-09-14
- Purpose
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The New Zealand Quasigeoid2009 (NZGeoid2009) can be used to convert GPS derived ellipsoidal heights to New Zealand Vertical Datum 2009 (NZVD2009) normal-orthometric heights that relate more closely to mean sea level and the local gravity field. NZGeoid2009 can also be used to transform heights to any of the 13 official local vertical datums used across New Zealand, more information on this transformation is available at http://www.linz.govt.nz/geodetic/conversion-coordinates/height-conversions .
- Status
- Completed
- Point of contact
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Role Organisation Electronic mail address Point of contact LINZ - Land Information New Zealand
- Spatial representation type
- Vector
- Topic category
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- Geoscientific information
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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*.xml
- Date
- Edition
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Unknown
- ANZLIC Jurisdictions
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New Zealand
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Resource constraints
- Classification
- Unclassified
Resource constraints
- Use limitation
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Crown copyright reserved
- Use constraints
- Copyright
Resource constraints
- Use limitation
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Released under Creative Commons By with:
Following Disclaimers:
1. This data is made available through the LINZ Data Service and is based on LINZ's New Zealand Quasigeoid 2009 (NZGeoid2009)
Following Attribution:
If you publish, distribute or otherwise disseminate this work to the public without adapting it, the following attribution to Land Information New Zealand should be used:
'CC-By 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 Land Information New Zealand should be used:
‘Contains data sourced from Land Information New Zealand under CC-By.'
If "attribution stacking" problems exist then the requirement to display the above attribution statements is waived and in lieu the attribution statement is to be made in any terms or conditions associated with the work/ product/ application/ etc.
- Use constraints
- License
- Language
- English
- Character encoding
- UTF8
Resource lineage
- Statement
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NZGeoid2009 is published on a one arc-minute grid (approximately 1.8 kilometres) over the New Zealand continental shelf (160° E to 170° W, 25° S to 60° S). It has an expected accuracy of 6 centimetres based on comparisons with GPS-levelling throughout New Zealand. It was calculated by enhancing a global geopotential model (EGM2008) using a combination of land and satellite based gravity observations together with a digital elevation model. GPS-levelling observations were not used to compute NZGeoid2009.
- Hierarchy level
- Dataset
- Other
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dataset
Metadata constraints
- Classification
- Unclassified
Metadata constraints
- Use limitation
-
Crown copyright reserved
- Use constraints
- Copyright
Metadata constraints
- Use limitation
-
Released under Creative Commons By
- Use constraints
- License
Metadata
- Metadata identifier
- 8794f0ce-6430-070a-300f-e6a02b4f5bd2
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation Electronic mail address Resource provider LINZ - Land Information New Zealand
Type of resource
- Resource type
- Dataset
- Name
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dataset
- Date info (Revision)
- 2012-01-28
Metadata standard
- Title
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ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata
- Edition
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1.1
