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Summary Practical manuel

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A snapshot of the summary - Practical manuel

  • 7 Module 7

  • What is a formal presentation of a logical data model?
    Can be in form of a data-action model
  • What is a data-action model?
    Gives a structured overview of the methodological framework to solve a spatial problem, in form of a flow charts
  • What do lightning bolts represent?
    Transformations
  • What do circles represent?
    Alternations
  • 8 Module 8

  • What is a query expression?
    A precise definition of what you want to select
  • What is spatial data queries?
    Select a set by working directly with features without using attributes and query expressions. This means that features are selected based on their distance to a ceratin location or based on their spatial relationship to other feautures
  • Which three spatial data query methods are there?
    - Cursor
    - Graphic
    - Spatial relationship
  • What is a spatial join?
    Joins the attribute tables of two vector datasets based on their 'shape'. A spatial join creates a new dataset, which contains both set of attributes and the new aatribute 'distance' 
  • What is the difference between raster data queries and vector data queries?
    Vector data queries allow you to select individual feautures from a dataset. But you cannot select individual raster cells. When you query a rester, you use the attribute 'value' in the query expression, so you will select a 'zone'of the raster dataset.
  • 9 Module 9

  • Which three groups of transformations are there?
    - Projection transformation
    - Georeferencing
    - Data structure transformation
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