23861 version 1
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Explain height differences, and carry out a levelling survey, for geodetic
surveying
Level
6
Credits
4
Purpose
This unit standard is for people who are working, or who intend to work, in
the surveying profession in a geodetic context.
People credited with this unit standard are able to explain terrestrial height
differences in relation to geodetic surveying, and carry out a levelling survey
to determine height differences for geodetic surveying.
Subfield
Surveying
Domain
Geodetic Surveying
Status
Registered
Status date
25 February 2008
Date version published
25 February 2008
Planned review date
31 December 2012
Entry information
Recommended: Unit 23860, Demonstrate knowledge of,
and calculate on, map projections, or demonstrate
equivalent knowledge and skills.
Replacement information
This unit standard and unit standard 23862 replaced unit
standard 11133.
Accreditation
Evaluation of documentation and visit by NZQA and
industry.
Standard setting body (SSB)
Infrastructure ITO
Accreditation and Moderation Action Plan (AMAP) reference
0101
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
1
The following legislation and documentation must be complied with:
Baker, R F and Watkins, M, Guidance Notes for Determination of Mean High Water
Mark for Land Title Surveys (Auckland: Professional Development Committee of the
New Zealand Institute of Surveyors, 1991), available at http://www.surveyors.org.nz
(the guidance notes);
 New Zealand Qualifications Authority 2016
23861 version 1
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Accuracy Standards for Geodetic Surveys (OSG Standard 1) Office of the SurveyorGeneral 2003, the current version available at http://www.linz.govt.nz;
Specifications for Geodetic Survey, Land Information New Zealand, the current
version available at http://www.linz.govt.nz.
2
Definition
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 http://www.linz.govt.nz.
Elements and performance criteria
Element 1
Explain terrestrial height differences in relation to geodetic surveying.
Performance criteria
1.1
The differences between the geoid and observed mean sea level are explained
in accordance with geodetic convention.
1.2
The differences between gravimetric and geometric heights are explained in
accordance with geodetic convention.
Range
gravimetric – orthometric, normal, normal-orthometric;
geometric – ellipsoid.
Element 2
Carry out a levelling survey to determine terrestrial height differences.
Performance criteria
2.1
A levelling datum is established from tide gauge data in accordance with the
guidance notes.
2.2
Transformations between ellipsoid height and normal-orthometric height using
New Zealand vertical datum and a geoid model are demonstrated in
accordance with geodetic convention.
Range
2.3
ellipsoid to normal-orthometric, normal-orthometric to ellipsoid.
A second Order levelling survey is carried out in accordance with the
Specifications for Geodetic Survey.
Range
include but are not limited to – levelling equipment selection,
equipment calibration, levelling observations, field reductions.
 New Zealand Qualifications Authority 2016
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Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact Infrastructure ITO askus@infratrain.co.nz if you wish to suggest changes to
the content of this unit standard.
 New Zealand Qualifications Authority 2016