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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD: 

Perform 2.5D vector surface queries 
SAQA US ID UNIT STANDARD TITLE
258803  Perform 2.5D vector surface queries 
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 7  Level TBA: Pre-2009 was L7  13 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Reregistered  2018-07-01  2023-06-30  SAQA 06120/18 
LAST DATE FOR ENROLMENT LAST DATE FOR ACHIEVEMENT
2024-06-30   2027-06-30  

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 design and perform basic 2.5D vector surface queries.

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

  • 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:
  • Spatial awareness unit standards.
  • Vector GIS software. 

  • 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), 2.5D.

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

    Range statement are included with specific outcomes as necessary. 

  • Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Understand and explain the principles of a Triangular Irregular Network (TIN) in the context of a surface. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Different surface types are understood and explained. 
    ASSESSMENT CRITERION RANGE 
    Including but not limited to 2.5D, 3D, continuous, discontinuous.
     

    ASSESSMENT CRITERION 2 
    A surface made up of regular and irregular triangles is understood and can be explained. 

    ASSESSMENT CRITERION 3 
    The attributes of a TIN needed to perform basic 2.5D vector surface queries is understood and explained. 
    ASSESSMENT CRITERION RANGE 
    Surface, Slope, Aspect, Point value, Position, Gradient, Orientation.
     

    ASSESSMENT CRITERION 4 
    The advantages of a TIN to perform basic 2.5D vector surface queries is understood and explained. 
    ASSESSMENT CRITERION RANGE 
    Efficient data storage, Efficient use in Models, Visualisation, deriving further information.
     

    ASSESSMENT CRITERION 5 
    Pits and saddles in the context of a surface model are understood and can be explained. 

    ASSESSMENT CRITERION 6 
    The basic 2.5D vector surface queries and applications that can be performed with TIN is understood and explained. 
    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. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Gradient is understood and can be calculated meeting national cartographic standards. 

    ASSESSMENT CRITERION 2 
    Aspect is understood and can be calculated meeting national cartographic standards. 

    ASSESSMENT CRITERION 3 
    Contours are understood and can be derived meeting national cartographic standards. 
    ASSESSMENT CRITERION RANGE 
    Interpolation methods.
     

    ASSESSMENT CRITERION 4 
    Viewshed is understood and can be generated meeting national cartographic standards. 

    ASSESSMENT CRITERION 5 
    Hill shading is understood and can be generated meeting national cartographic standards. 
    ASSESSMENT CRITERION RANGE 
    Include but not limited to fixed light source, sun, moon, temporal differences, azimoth, elevations, perspechtives.
     

    SPECIFIC OUTCOME 3 
    Calculate profiles of a geographical area. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    A cross section is understood and can be generated successfully in terms of cartographic requirements. 

    ASSESSMENT CRITERION 2 
    A linear long section is understood and can be generated successfully in terms of cartographic requirements. 

    ASSESSMENT CRITERION 3 
    A curvilinear long section is understood and can be generated successfully in terms of cartographic requirements. 

    ASSESSMENT CRITERION 4 
    A nautical profile is understood and can be generated successfully in terms of cartographic requirements. 

    SPECIFIC OUTCOME 4 
    Generate visualisations of TINs. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    Perspective views are understood and can be generated using GIS standards and specifications. 
    ASSESSMENT CRITERION RANGE 
    Normal, Hidden.
     

    ASSESSMENT CRITERION 2 
    Draping features over a TIN is understood and can be demonstrated using GIS standards and specifications. 

    ASSESSMENT CRITERION 3 
    Line of site is understood and can be generated using GIS standards and specifications. 

    ASSESSMENT CRITERION 4 
    A wire frame model is understood and can be generated using GIS standards and specifications. 
    ASSESSMENT CRITERION RANGE 
    Normal, Hidden.
     

    SPECIFIC OUTCOME 5 
    Calculate volumes from surfaces on a geographical area. 

    ASSESSMENT CRITERIA
     

    ASSESSMENT CRITERION 1 
    A cut in a TIN is understood and can be generated using GIS standards and specifications. 

    ASSESSMENT CRITERION 2 
    A fill on a TIN is understood and can be generated using GIS standards and specifications. 

    ASSESSMENT CRITERION 3 
    Multiple surface cuts and fills between TINs are understood and can be generated using GIS standards and specifications. 

    ASSESSMENT CRITERION 4 
    A tunnel through a TIN is understood and can be generated using GIS standards and specifications. 
    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 is dealt with under the specific outcomes section where "Demonstrate KNOWLEDGE and UNDERSTANDING" is required. 

    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:
  • TIN: Triangulated Irregular Network.
  • DTM: Digital Terrain Model.
  • DEM: Digital Elevation Model. 

  • QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Fundamental  63711   Bachelor of Geographical Information Science (GISc)  Level 7  NQF Level 07  Passed the End Date -
    Status was "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.