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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Perform 2.5D vector surface queries under supervision 
SAQA US ID UNIT STANDARD TITLE
258776  Perform 2.5D vector surface queries under supervision 
ORIGINATOR
SGB Geographical Information Sciences 
PRIMARY OR DELEGATED QUALITY ASSURANCE FUNCTIONARY
-  
FIELD SUBFIELD
Field 12 - Physical Planning and Construction Physical Planning, Design and Management 
ABET BAND UNIT STANDARD TYPE PRE-2009 NQF LEVEL NQF LEVEL CREDITS
Undefined  Regular  Level 6  Level TBA: Pre-2009 was L6  10 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2015-07-01  2018-06-30  SAQA 10105/14 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2019-06-30   2022-06-30  

In all of the tables in this document, both the pre-2009 NQF Level and the NQF Level is shown. In the text (purpose statements, qualification rules, etc), any references to NQF Levels are to the pre-2009 levels unless specifically stated otherwise.  

This unit standard does not replace any other unit standard and is not replaced by any other unit standard. 

PURPOSE OF THE UNIT STANDARD 
This unit standard has been developed for the GIS occupational area and is intended for persons who aim to achieve career advancement by gaining GIS skills leading to qualification based on unit standards. A person who has successfully completed this unit standard will have an understanding of how to perform 2.5D vector surface queries under supervision.

A person credited with this unit standard is able to:
  • Understand and explain the principles of a TIN.
  • Perform simple surface derived analysis under supervision.
  • Calculate profiles under supervision.
  • Generate visualisations of TINs under supervision.
  • Calculate volumes from surfaces under supervision. 

  • LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    The credit calculation is based on the assumption that learners are already competent in terms of the following outcomes or areas of learning when starting to learn towards this unit standard:
  • Communication at NQF Level 5.
  • Mathematical Literacy at NQF Level 5.
  • Skills and competencies associated with core unit standards required for GISc Operator level. 

  • UNIT STANDARD RANGE 
    The following scope and context applies to the whole unit standard:
  • Triangulated Irregular Network (TIN), Digital Terrain Model (DTM), Digital Elevation Model (DEM).

    Specific range statements are provided in the body of the unit standard where they apply to particular specific outcomes or assessment criteria.

    Range statements are included with specific outcomes as necessary. 

  • Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Understand and explain the principles of a TIN. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    A surface made up of regular and irregular triangles is understood and can be explained in relation to the principles of a TIN. 

    ASSESSMENT CRITERION 2 
    The learner understands and explains attributes of a TIN needed to perform basic 2.5D vector surface queries. 
    ASSESSMENT CRITERION RANGE 
    Surface, Slope, Aspect, Point value, Position, Gradient, Orientation.
     

    ASSESSMENT CRITERION 3 
    The learner understands and explains advantages of a TIN to perform basic 2.5D vector surface queries. 
    ASSESSMENT CRITERION RANGE 
    Efficient data storage, Efficient use in Models, Visualisation, deriving further information.
     

    ASSESSMENT CRITERION 4 
    The learner understands and explains the basic 2.5D vector surface queries and applications that can be performed with TIN. 
    ASSESSMENT CRITERION RANGE 
    Including but not limited to runoff, population distribution, temperature studies, Site selection, Environmental Impact Assessment, Visibility analysis, Diffusion modelling, presence or absence of barriers.
     

    SPECIFIC OUTCOME 2 
    Perform simple surface derived analysis under supervision. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Slope is understood and can be calculated under supervision. 

    ASSESSMENT CRITERION 2 
    Aspect is understood and can be calculated under supervision. 

    ASSESSMENT CRITERION 3 
    Contours are understood and can be derived under supervision. 

    ASSESSMENT CRITERION 4 
    Viewshed is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 5 
    Hill shading is understood and can be generated under supervision. 
    ASSESSMENT CRITERION RANGE 
    Fixed light source, Sun, Moon, Temporal differences.
     

    SPECIFIC OUTCOME 3 
    Calculate profiles under supervision. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    A cross section is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 2 
    A linear long section is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 3 
    A curvilinear long section is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 4 
    A nautical profile is understood and can be generated under supervision. 

    SPECIFIC OUTCOME 4 
    Generate visualisations of TINs under supervision. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Perspective views are understood and can be generated under supervision. 
    ASSESSMENT CRITERION RANGE 
    Normal, Hidden.
     

    ASSESSMENT CRITERION 2 
    Draping features over a TIN is understood and can be demonstrated under supervision. 

    ASSESSMENT CRITERION 3 
    Line of site is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 4 
    A wire frame model is understood and can be generated under supervision. 
    ASSESSMENT CRITERION RANGE 
    Normal, Hidden.
     

    SPECIFIC OUTCOME 5 
    Calculate volumes from surfaces under supervision. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    A cut in a TIN is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 2 
    A fill on a TIN is understood and can be generated under supervision. 

    ASSESSMENT CRITERION 3 
    Multiple surface cuts and fills between TINs are understood and can be generated under supervision. 

    ASSESSMENT CRITERION 4 
    A tunnel through a TIN is understood and can be generated under supervision. 
    ASSESSMENT CRITERION RANGE 
    Cylinder (Circular and Elliptical cross sections), Rectangular.
     


    UNIT STANDARD ACCREDITATION AND MODERATION OPTIONS 
  • Anyone assessing a learner against this unit standard must be registered as an assessor with the relevant ETQA.
  • Any institution offering learning that will enable achievement of this unit standard must be accredited as a provider through the relevant ETQA by SAQA.
  • Moderation of assessment will be overseen by the relevant ETQA according to the moderation guidelines and the agreed ETQA procedures. 

  • UNIT STANDARD ESSENTIAL EMBEDDED KNOWLEDGE 
    Essential embedded knowledge will be assessed through assessment of the specific outcomes in terms of the stipulated assessment criteria. Candidates are unlikely to achieve all the specific outcomes, to the standards described in the assessment criteria, without knowledge of the listed embedded knowledge. This means that for the most part, the possession or lack of the knowledge can be directly inferred from the quality of the candidate's performance. Where direct assessment of knowledge is required, assessment criteria have been included in the body of the unit standard.
  • Visualisation.
  • Perspective view.
  • 2.5 D. 

  • UNIT STANDARD DEVELOPMENTAL OUTCOME 
    N/A 

    UNIT STANDARD LINKAGES 
    N/A 


    Critical Cross-field Outcomes (CCFO): 

    UNIT STANDARD CCFO IDENTIFYING 
    Solve problems. 

    UNIT STANDARD CCFO WORKING 
    Work effectively with others as a member of a team/group/organisation or community. 

    UNIT STANDARD CCFO ORGANISING 
    Organise and manage oneself and one`s activities responsibly and effectively. 

    UNIT STANDARD CCFO COLLECTING 
    Collect, organise and critically evaluate information. 

    UNIT STANDARD CCFO COMMUNICATING 
    Communicate effectively using visual, mathematics and language skills in the modes of oral and written presentations. 

    UNIT STANDARD CCFO SCIENCE 
    Use science and technology effectively and critically (showing responsibility towards the environment and health of others). 

    UNIT STANDARD CCFO DEMONSTRATING 
    Display an understanding of the world as a set of related systems. 

    UNIT STANDARD CCFO CONTRIBUTING 
    Contribute to the full development of each learner and the social and economic development of society at large. 

    UNIT STANDARD ASSESSOR CRITERIA 
    N/A 

    REREGISTRATION HISTORY 
    As per the SAQA Board decision/s at that time, this unit standard was Reregistered in 2012; 2015. 

    UNIT STANDARD NOTES 
    Terminology:

    2.5 D:
  • Two and a half dimensional data consists of points with planemetric coordinates (E.g. Latitude and Longitude) and a variable value at each point. E.g.. Elevation, depth, temperature.

    Notes to Assessors:
  • This unit standard refers specifically to surfaces with planimetric co-ordinates and a variable such as elevation or temperature.
  • Watershed identification will be included in another unit standard dealing with flow lines, catchments, etc. at a more advanced level.
  • Nautical profile refers to the sectional profile found on nautical charts. 

  • QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  63689   Bachelor of Arts: Geographical Information Science  Level 6  Level TBA: Pre-2009 was L6  Reregistered  2018-06-30   


    PROVIDERS CURRENTLY ACCREDITED TO OFFER THIS UNIT STANDARD: 
    This information shows the current accreditations (i.e. those not past their accreditation end dates), and is the most complete record available to SAQA as of today. Some Primary or Delegated Quality Assurance Functionaries have a lag in their recording systems for provider accreditation, in turn leading to a lag in notifying SAQA of all the providers that they have accredited to offer qualifications and unit standards, as well as any extensions to accreditation end dates. The relevant Primary or Delegated Quality Assurance Functionary should be notified if a record appears to be missing from here.
     
    NONE 



    All qualifications and part qualifications registered on the National Qualifications Framework are public property. Thus the only payment that can be made for them is for service and reproduction. It is illegal to sell this material for profit. If the material is reproduced or quoted, the South African Qualifications Authority (SAQA) should be acknowledged as the source.