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Vector and Raster Data Models

Vector and Raster Data Models. Advantages and Disadvantages (28/05/2010). Vector and Raster Models in GIS. Representation of Lines . Raster. Vector. Vector Data: Advantages. Data can be represented at its original resolution. Graphic output is usually more aesthetically pleasing.

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Vector and Raster Data Models

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  1. Vector and Raster Data Models Advantages and Disadvantages (28/05/2010)

  2. Vector and Raster Models in GIS Representation of Lines Raster Vector

  3. Vector Data: Advantages • Data can be represented at its original resolution. • Graphic output is usually more aesthetically pleasing. • Accurate geographic location of data is maintained. • Allows for topology and as a result more efficient operations, e.g. proximity, network analysis, etc.

  4. Vector Data: Disadvantages • The location of each vertex needs to be stored. • For effective analysis, vector data must be converted into a topological structure. This is often processing intensive and usually requires extensive data cleaning. As well, topology is static, and any updating or editing of the vector data requires re-building of the topology.

  5. Vector Data: Disadvantages • Algorithms for manipulative and analysis functions are complex and may be processing intensive. • Limits the functionality for large data sets, e.g. a large number of features. • Continuous data, such as elevation data, is not effectively represented in vector form.

  6. Raster Data: Advantages • The geographic location of each cell is implied by its position in the cell matrix. • Due to the nature of the data storage technique data analysis is usually easy to program and quick to perform. • The nature of raster maps, e.g. one attribute maps, is ideally suited for mathematical modeling and quantitative analysis.

  7. Raster Data: Advantages • Discrete data, is accommodated equally well as continuous data, and facilitates the integrating of the two data types. • Grid-cell systems are very compatible with raster-based output devices, e.g. electrostatic plotters. • 5. The cell size determines the resolution at which the data is represented.

  8. Raster Data: Disadvantages • It is difficult to represent linear features depending on the cell resolution. • Processing of associated attribute data may be cumbersome if a large amount of data exists. • Raster maps inherently reflect only one attribute or characteristic for an area.

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