6. Design-pattern

  • 6.19. Iterator mode

    The iterator pattern (Iterator Pattern) is a very common design pattern in Java and .net programming environments. Thi...
    2025-10-25 12:24:46 UTC
  • 6.20. Intermediary model

    The intermediary pattern (Mediator Pattern) is used to reduce the complexity of communication between multiple objects...
    2025-10-25 12:24:44 UTC
  • 6.21. Memo mode

    Memo mode (Memento Pattern) saves a state of an object so that it can be restored at an appropriate time. The memo mod...
    2025-10-25 12:24:44 UTC
  • 6.22. Observer mode

    The Observer pattern (Observer Pattern) is used when there is an one-to-many relationship between objects. For example...
    2025-10-25 12:24:47 UTC
  • 6.23. State mode

    In State Pattern, the behavior of a class changes based on its state. This type of design pattern belongs to behaviora...
    2025-10-25 12:24:45 UTC
  • 6.24. Null object mode

    In the null object schema (Null Object Pattern), an empty object replaces the check of the NULL object instance. Inste...
    2025-10-25 12:24:48 UTC
  • 6.25. Strategy mode

    In Strategy Pattern, the behavior of a class or its algorithm can be changed at run time. This type of design pattern ...
    2025-10-25 12:24:47 UTC
  • 6.26. Template mode

    In the template pattern (Template Pattern), an abstract class exposes a way / template that defines the method in whic...
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  • 6.27. Visitor mode

    In the visitor pattern (Visitor Pattern), we use a visitor class that changes the execution algorithm of the element c...
    2025-10-25 12:24:49 UTC
  • 6.28. MVC mode

    The MVC pattern stands for the Model-View-Controller (Model-View-Controller) pattern. Model...
    2025-10-25 12:24:44 UTC
  • 6.29. Business representative model

    The Business Representative pattern (Business Delegate Pattern) is used to decouple the presentation layer from the bu...
    2025-10-25 12:24:48 UTC
  • 6.30. Combined entity mode

    The composite entity pattern (Composite Entity Pattern) is used in the EJB persistence mechanism. A composite entity i...
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  • 6.31. Data access object mode

    The data access object pattern (Data Access Object Pattern) or DAO pattern is used to separate low-level data access A...
    2025-10-25 12:24:47 UTC
  • 6.32. Front-end controller mode

    The front-end controller pattern (Front Controller Pattern) is used to provide a centralized request processing mechan...
    2025-10-25 12:24:44 UTC
  • 6.33. Intercept filter mode

    Define the filter and apply it to the request before passing it to the actual target application. The following are t...
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  • 6.34. Service locator mode

    The Service Locator pattern (Service Locator Pattern) is used when we want to use JNDI queries to locate various servi...
    2025-10-25 12:24:45 UTC
Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.