23859 Demonstrate knowledge of geodetic reference systems ...



|Title |Demonstrate knowledge of geodetic reference systems and describe the New Zealand geodetic datums |

|Level |6 |Credits |5 |

|Purpose |People credited with this unit standard are able to demonstrate knowledge of geodetic reference |

| |systems, and describe the New Zealand geodetic datums. |

|Classification |Surveying > Geodetic Surveying |

|Available grade |Achieved |

Guidance Information

1 Documentation relevant to this unit standard includes but is not limited to:

L P, First-order, Geodetic Triangulation of New Zealand 1909-1949; 1973-1974. (Wellington: Department of Lands and Survey, 1978), referred to as Geodetic Datum 1949;

Snay, RA and Soler, T, Modern Terrestrial Reference Systems (Part 1), published in Professional Surveyor December 1999, available at ;

Where in the World Are We? Land Information New Zealand available at .

2 Definitions

DORIS refers to Doppler Orbitography and Radiopositioning Integrated by Satellite.

NZGD 1949 refers to the New Zealand Geodetic Datum dated 1949.

NZGD 2000 refers to the New Zealand Geodetic Datum dating from 2000.

Geodetic convention refers to the principles and practices outlined in Bomford, G, Geodesy, Fourth edition (Oxford: Oxford University Press, 1980) and in Land Information New Zealand (LINZ) publications and fact sheets available from the survey system and geodetic information pages at .

GRS refers to Geodetic Reference System.

ITRF refers to International Terrestrial Reference Frame.

WGS refers to World Geodetic System.

Outcomes and performance criteria

Outcome 1

Demonstrate knowledge of geodetic reference systems.

Performance criteria

1.1 The difference between inertial and earth-fixed reference systems is described in accordance with geodetic convention.

1.2 An international terrestrial reference frame is described in terms of how it is set up.

Range reference frames include but are not limited to – ITRF 2000, WGS 84, ITRF 96.

1.3 The differences between the physical Earth, the geoid, and an ellipsoid of revolution are outlined in accordance with geodetic convention.

1.4 The parameters of geoid-ellipsoid separation and deflection of the vertical are defined and explained in accordance with geodetic convention.

1.5 A global reference system is defined and explained in accordance with geodetic convention.

Range global reference systems include but are not limited to – GRS 80, ITRF 96, ITRF 2000, WGS 84.

1.6 Positions on the Earth's surface are defined in terms of Cartesian coordinates, geographic coordinates, and the ellipsoidal height.

1.7 The differences between the geoid and observed mean sea level, and between geometric and gravimetric heights are explained in accordance with geodetic convention.

Outcome 2

Describe the New Zealand geodetic datums.

Performance criteria

2.1 The primary differences between NZGD 1949 and NZGD 2000 are described in accordance with LINZ publications.

2.2 The primary differences between NZVD 2009, the geoid and ellipsoid are described in accordance with LINZ publications.

This unit standard is expiring. Assessment against the standard must take place by the last date for assessment set out below.

Status information and last date for assessment for superseded versions

|Process |Version |Date |Last Date for Assessment |

|Registration |1 |25 February 2008 |31 December 2017 |

|Review |2 |21 April 2016 |31 December 2022 |

|Review |3 |25 February 2021 |31 December 2022 |

|Consent and Moderation Requirements (CMR) reference |0101 |

This CMR can be accessed at .

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