23873 version 1
Page 1 of 4
Confirm the reliability of existing land survey marks
Level
6
Credits
12
Purpose
This unit standard is for people working, or who intend to work, in the
surveying profession as a survey technician in a land surveying context.
People credited with this unit standard are able to: analyse existing
documents for survey data; locate existing survey marks using a variety of
methods; and explain surveying measurement terminology and assess the
reliability of existing survey marks.
Subfield
Surveying
Domain
Survey Practice
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
1
The following legislation and documentation must be complied with:
Cadastral Survey Act 2002;
Surveyor-General’s Rules for Cadastral Survey 2002/2, Surveyor-General’s Rulings
and Advisory Notes, and Geodetic specifications and forms published by Land
Information New Zealand at http://www.linz.org.nz;
job specifications;
service utility records;
survey plans.
 New Zealand Qualifications Authority 2016
23873 version 1
Page 2 of 4
2
Terminology may be referenced from the New Zealand Institute of Surveyors
website, http://www.surveyors.org.nz, when available, or from the recommended
reference, Definitions of Surveying and Associated Terms 2005, American Congress
on Surveying and Mapping, available at http://www.acsm.net/estore/.
3
Definition
GPS refers to the United States NAVSTAR GPS or Navigation Signal Timing and
Ranging Global Positioning System.
Elements and performance criteria
Element 1
Analyse existing documents for survey data.
Range
existing documents may include– survey plans, titles, service utility records,
local authority records, cadastral data set, workplace records;
surveys may include – cadastral, as-built, topographical, engineering,
construction;
evidence is required for five surveys.
Performance criteria
1.1
Documents are analysed for a possible origin in accordance with job
specifications.
1.2
Analysis of documents determines the presence of physical features that will
impact on the job.
Range
impacts may include but are not limited to – traffic, topography,
obstructions, services.
1.3
Data from documents are analysed for level datum in accordance with job
specifications.
1.4
Data from documents are analysed for connection to the survey in accordance
with job specifications.
Element 2
Locate existing survey marks using a variety of methods.
Performance criteria
2.1
Methods selected for locating existing survey marks ensure that the marks are
found.
Range
method – offsets from a physical object, traverse, resection,
intersection, free station;
may include – GPS.
 New Zealand Qualifications Authority 2016
23873 version 1
Page 3 of 4
2.2
Existing survey marks are located in accordance with survey data.
Range
marks – boundary peg, iron tube, iron spike, survey standard, lead
plug, aluminium mark, trig station.
Element 3
Explain surveying measurement terminology and assess the reliability of existing survey
marks.
3.1
Basic concepts in correct surveying measurement are explained in accordance
with surveying terminology.
Range
3.2
The accuracy of methods and equipment used to measure distance and angles
for surveying is explained in accordance with the capability of total station
surveying instruments.
Range
3.3
factors – stability, ground conditions, physical features.
Reliability of existing survey marks is assessed by re-observing previous survey
observations in accordance with position requirements for Class 1 cadastral
surveys and level requirements for third order geodetic specifications.
Range
3.6
accuracy of – observations, measurements, adjustments applied
to account for misclosures;
accuracy of misclosures to Class 1 cadastral survey requirements;
adjustments – bowditch or least squares.
Factors affecting the reliability of survey marks are explained in accordance with
the Surveyor General’s Rulings and Advisory Notes.
Range
3.5
three methods.
The reliability of existing survey marks is explained in terms of practical limits on
the accuracy of surveying in the field, and subsequent adjustments.
Range
3.4
measurement theory, measurement practice;
terminology – accuracy, precision, tolerance, misclosure,
reliability, error;
error types – random, systematic, gross.
at least three survey marks.
Reliability of existing survey marks is assessed by new observations and
calculations in accordance with position requirements for Class 1 cadastral
surveys and level requirements for third order geodetic specifications.
Range
at least three survey marks.
 New Zealand Qualifications Authority 2016
23873 version 1
Page 4 of 4
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