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Object-Oriented Design of Spatial Entities Todd Bacastow

Object-Oriented Design of Spatial Entities Todd Bacastow. Object-Oriented Design. an approach used to specify the software solution in terms of collaborating objects, their attributes, and their methods. MyClassName. + SomePublicAttribute : SomeType - SomePrivateAttribute : SomeType

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Object-Oriented Design of Spatial Entities Todd Bacastow

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  1. Object-Oriented Design of Spatial EntitiesTodd Bacastow

  2. Object-Oriented Design • an approach used to specify the software solution in terms of collaborating objects, their attributes, and their methods.

  3. MyClassName +SomePublicAttribute : SomeType -SomePrivateAttribute : SomeType #SomeProtectedAttribute : SomeType +ClassMethodOne() +ClassMethodTwo() Responsibilities -- can optionally be described here. Parts of a Class • Classes can have four parts • Name • Attributes • Operations • Responsibilities • Classes can show visibility and types. • All parts but the Name are optional.

  4. UML Class Diagram

  5. What’s Unique About Spatial? • Topology rules – e.g., political boundaries • Semantic integrity – e.g., roads do not run through structures • User defined business rules – e.g., one way streets

  6. Geospatial Classes Symbols

  7. Geospatial Field Classes

  8. Geo-Object w/ Geometry

  9. Geo-Objects w/ geometry & topology

  10. Relationships

  11. Relationships (Cont)

  12. Cardinality

  13. Generalization (not spatial)

  14. Generalization (spatial)

  15. Aggregation (not spatial)

  16. Aggregation (spatial)

  17. Cartographic Generalization

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