11137 version 5
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Process tidal data
Level
5
Credits
6
Purpose
This unit standard is for people working in the hydrography sector of the
surveying profession.
People credited with this unit standard are able to: demonstrate knowledge of
tidal theory; select and establish a vertical datum for tidal data reduction; and
demonstrate knowledge of, and apply co-tidal factors to tidal readings.
Subfield
Surveying
Domain
Hydrography
Status
Registered
Status date
25 February 2008
Date version published
25 February 2008
Planned review date
31 December 2012
Entry information
Open.
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
Documentation relevant to this unit standard includes but is not limited to:
TH Standard 31 Standards for Hydrographic Surveys (HYSPEC) v3 (Wellington: National
Topographic/Hydrographic Authority, 2001), available at http://www.linz.govt.nz;
IHO Standards for Hydrographic Surveys, Special Publication No 44 (Monaco:
International Hydrographic Organisation, 1998) (IHO standards), available at
http://www.iho.shom.fr;
tide tables available from the tidal information pages in the hydrography section at
http://www.linz.govt.nz;
 New Zealand Qualifications Authority 2016
11137 version 5
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Garrison, Tom. Oceanography: An Invitation to Marine Science, Sixth edition (Belmont,
CA: Thomson Brooks/Cole, 2007);
Prager, Ellen J, with Earle, Sylvia A, The Oceans (New York: McGraw-Hill, 2000);
Summerhayes, C P, and Thorpe, SA. Oceanography, An Illustrated Guide (New York:
John Wiley & Sons, 1996);
Thurman, Harold V, and Trujillo, Alan P, Essentials of Oceanography, Eighth edition
(Upper Saddle River, NJ: Prentice Hall, 2005).
Elements and performance criteria
Element 1
Demonstrate knowledge of tidal theory.
Performance criteria
1.1
The tide generating forces and principal tidal constituents are explained in
accordance with the laws of physics and static and dynamic tidal theory.
1.2
The factors modifying the theoretical tide are explained in accordance with
static and dynamic tidal theory.
Range
1.3
Specific examples of modified tides are explained in accordance with static and
dynamic tidal theory.
Range
1.4
meteorological resonance, land mass, astronomical influence,
Coriolis force.
modified tides – surges, negative surges, bores, seiches, diurnal
tides, amphidromic points.
Factors in the analysis and prediction of tides are identified and explained in
accordance with tidal theory.
Element 2
Select and establish a vertical datum for tidal data reduction.
Range
one of – mean high water springs, mean sea level, mean low water springs,
lowest astronomical tide, sounding datum, chart datum.
Performance criteria
2.1
A vertical datum is selected which enables reference levels to be determined for
soundings, heights, and clearances.
2.2
Sounding datum is established by transfer to or from a site benchmark in
accordance with HYSPEC.
2.3
The connection between recorded tidal height and sounding datum is
determined in accordance with HYSPEC.
 New Zealand Qualifications Authority 2016
11137 version 5
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Element 3
Demonstrate knowledge of, and apply co-tidal factors to tidal readings.
Performance criteria
3.1
Factors affecting co-tidal data are determined from tidal observations within the
survey area.
Range
3.2
factors – time, height, location of tidal measurement sites, wave
fronts.
Requirements for co-tidal charts are identified in accordance with HYSPEC.
Range
standard port, secondary port.
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