Summary: Practical Manuel

Read the summary and the most important questions on Practical manuel

• 7 Module 7

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• 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

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• 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

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• Which three groups of transformations are there?

  - Projection transformation
  - Georeferencing
  - Data structure transformation