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SOUTH AFRICAN QUALIFICATIONS AUTHORITY 
REGISTERED UNIT STANDARD THAT HAS PASSED THE END DATE: 

Perform data generalisation and aggregation 
SAQA US ID UNIT STANDARD TITLE
258761  Perform data generalisation and aggregation 
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  3 
REGISTRATION STATUS REGISTRATION START DATE REGISTRATION END DATE SAQA DECISION NUMBER
Passed the End Date -
Status was "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 is useful for people who aim to achieve career advancement in the GIS field and provides them with essential knowledge in relation to data generalisation and aggregation.

A person credited with this unit standard is able to:
  • Understand different methods to generalise spatial entities.
  • Understand the context of spatial data generalisation.
  • Understand the context within which to aggregate spatial data. 
    		•

    LEARNING ASSUMED TO BE IN PLACE AND RECOGNITION OF PRIOR LEARNING 
    The assumption is that learners are already competent in f the following:
  • Communication at NQF Level 6.
  • Maths Literacy at NQF Level 6.
  • Demonstrate a basic understanding of spatial modeling in GISc. 
    		•

    UNIT STANDARD RANGE 
    N/A 

    Specific Outcomes and Assessment Criteria: 

    SPECIFIC OUTCOME 1 
    Understand different methods to generalise spatial entities in either a cartographic or GIS project. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Feature instance simplification is understood and explained that will meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Lines and Polygons.
     

    ASSESSMENT CRITERION 2 
    Feature instance smoothing is understood and explained that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Lines and Polygons.
     

    ASSESSMENT CRITERION 3 
    Feature instance displacement is understood and explained that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Points, Lines and Polygons.
     

    ASSESSMENT CRITERION 4 
    Cartographic texture enhancements of feature instances are understood and explained that will meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Lines and Polygons.
     

    ASSESSMENT CRITERION 5 
    Feature instance merging is understood and explained that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Points, Lines and Polygons.
     

    ASSESSMENT CRITERION 6 
    Feature instance elimination is understood and explained that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Points, Lines and Polygons.
     

    SPECIFIC OUTCOME 2 
    Understand the context of spatial data generalisation in either a cartographic or GIS project. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Spatial data is generalised for processing purposes that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Including but not limited to:
  • Reduced plotting time.
  • Optimising Processing time.
  • Reduced storage.
     
    		•

    ASSESSMENT CRITERION 2 
    Spatial data is generalised for cartographic purposes that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Including but not limited to:
  • Utilise data at different scales.
  • Integrate different data sets.
     
    		•

    SPECIFIC OUTCOME 3 
    Understand the context within which to aggregate spatial data in either a cartographic or GIS project. 

    ASSESSMENT CRITERIA     

    ASSESSMENT CRITERION 1 
    Spatial entities are aggregated according to feature instance relationships that would meet the requirements of the project. 

    ASSESSMENT CRITERION 2 
    Spatial entities are aggregated according to feature attribute relationships that would meet the requirements of the project. 
    ASSESSMENT CRITERION RANGE 
    Data measurement levels (Nominal, ordinal, interval, ratio.) are given due consideration.
     

    ASSESSMENT CRITERION 3 
    Use different Boolean operators to aggregate spatial data that would meet the requirements of the project. 

    ASSESSMENT CRITERION 4 
    Spatial entities are aggregated according to feature class relationships that would meet the requirements of the project. 


    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:
  • Texture enhancement: Texture enhancement refers to the addition of random texture or detail after a feature has already been simplified in order to make it appear cartographically correct.

    Notes to Assessors:
  • It is important to integrate the content of this unit standard with spatial (cartographic) modelling since generalisation and aggregation operations are best controlled using appropriate spatial modelling. 
    		•

    QUALIFICATIONS UTILISING THIS UNIT STANDARD: 
      ID QUALIFICATION TITLE PRE-2009 NQF LEVEL NQF LEVEL STATUS END DATE PRIMARY OR DELEGATED QA FUNCTIONARY
    Core  63711   Bachelor of Geographical Information Science (GISc)  Level 7  NQF Level 07  Passed the End Date -
    Status was "Reregistered"     		 2018-06-30   
    Elective  63689   Bachelor of Arts: Geographical Information Science  Level 6  Level TBA: Pre-2009 was L6  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.