NZQA registered unit standard
29409 version 1
Page 1 of 3
Title
Demonstrate knowledge of height datums and global navigation
satellite system for geodetic surveying
Level
6
Credits
10
Purpose
People credited with this unit standard are able to: explain
height datums in relation to geodetic surveying, and
demonstrate knowledge of GNSS used for geodetic surveying
Classification
Surveying > Survey Practice
Available grade
Achieved
Explanatory notes
1
Accuracy Standards for Geodetic Surveys (OSG Standard 1) Office of the SurveyorGeneral 2003, the current version available at http://www.linz.govt.nz;
Guidelines for Simplified Geodetic Control Surveys, Land Information New Zealand,
the current version available at http://www.linz.govt.nz/data/geodeticsystem/standards-specifications-and-publications.
2
Assessment against this unit standard must utilise the most current information
available in this developing area of knowledge and practice. This information may be
accessed from websites on the internet such as:
International GNSS Service at http://igscb.jpl.nasa.gov;
Land Information New Zealand in publications and fact sheets available from the
Survey System, and Geodetic Information pages at http://www.linz.govt.nz.
3
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.
GNSS stands for global navigational satellite system, and refers to satellite based
positioning systems such as GPS, GLONASS, and Galileo;
Outcomes and evidence requirements
Outcome 1
Explain height datums in relation to geodetic surveying.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
29409 version 1
Page 2 of 3
Evidence requirements
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.
Outcome 2
Demonstrate knowledge of a GNSS used for geodetic surveying.
Evidence requirements
2.1
GNSS is described in terms of its elements and function.
Range
function – theory of operation, satellite constellation, measurement
parameters, accuracy, quality factors, tests.
2.2
GNSS observables are defined in accordance with geodetic convention.
2.3
The limitations of GNSS technology for geodetic surveying are explained in
terms of error sources and corrections.
Range
2.4
sources – multipathing, broadcast ephemeris, precise ephemeris,
elevation windows, obstructions;
corrections – ionospheric, tropospheric, elevation windows,
obstructions.
GNSS is described in terms of positioning methods for geodetic surveying.
Range
methods – precise point, static, kinematic virtual reference station.
Outcome 3
Undertake a least squares adjustment of a control network.
Evidence requirements
3.1
Using appropriate software, a least squares adjustment of a control network is
undertaken.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
Planned review date
29409 version 1
Page 3 of 3
31 December 2020
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
21 April 2016
N/A
Consent and Moderation Requirements (CMR) reference
0101
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR 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 the Infrastructure ITO qualifications@connexis.org.nz if you wish to
suggest changes to the content of this unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016