Transformations

7 important questions on Transformations

What types of transformations are there?

- Thematic
- Geometric

What are the advantages of vector?

- Compact data structure
- Explicit description of topology
- Coordinate transformation
- Accurate graphic presentation

What are the disadvantages of vector?

- Complex data structure
- Combining data sets
- Spatial analysis is expensive
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What are the advantages of raster?

- Simple data structure
- Modeling and analysis are easier
- Less expensive to render

What are the disadvantages of raster?

- Large data volumes
- Coordinate transforation
- Harder to update

Give a summary of vector to raster?

- Feature type, attribute value
- Priority rules (weights) in case: many feature types, many attribute values
- Allocation rules : feature percentage of cell size

What is the summary raster to vector?

Object/feature approach:
1 - Into what object/feature type (point, polyline or polygon)
2 - Object/feature construction rules: -thematic classes - topology
3 - Transformation into data structure
4 - Geometric cosmetics

The question on the page originate from the summary of the following study material:

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