9. Swift

  • 9.33. Swift attribute

    The Swift property associates a value with a specific class, structure, or enumeration. Attributes can be div...
    2023-12-08 01:10:06 UTC
  • 9.34. Swift method

    Swift methods are functions associated with certain types In Objective-C, a class is the only type that can d...
    2023-12-08 01:10:05 UTC
  • 9.36. Swift inheritance

    Inheritance can be understood as one class getting the methods and properties of another class. When a class ...
    2023-12-08 01:10:06 UTC
  • 9.37. Swift construction process

    The construction process is a preparation process for using an instance of aclass, structure, or enumerated type. This...
    2023-12-08 01:10:05 UTC
  • 9.38. Swift destructing process

    The destructor is called immediately before an instance of a class is released. Use keywords deinit ...
    2023-12-08 01:10:05 UTC
  • 9.39. Swift optional chain

    An optional chain is a process that can request and invoke properties, methods, and subscripts, and the target for a r...
    2023-12-08 01:10:05 UTC
  • 9.40. Swift automatic reference count (ARC)

    Swift uses automatic reference counting (ARC) to track and manage application memory Usually we don’t need to...
    2023-12-08 01:10:05 UTC
  • 9.41. Swift type conversion

    Swift language type conversion can determine the type of instance. It can also be used to detect whether an instance t...
    2023-12-11 00:54:57 UTC
  • 9.42. Swift extension

    An extension is to add new functionality to an existing class, structure, orenumerated type. An extension can...
    2023-12-08 01:10:05 UTC
  • 9.43. Swift protocol

    The protocol specifies the methods and properties necessary to implement a particular function. Any type that...
    2023-12-11 00:54:58 UTC
  • 9.44. Swift generics

    Swift provides generics that allow you to write flexible and reusable functions and types. The Swift standard...
    2023-12-08 01:10:05 UTC
  • 9.45. Swift access control

    Access control can limit the level of access to your code from other source files or modules. You can explici...
    2023-12-11 00:54:58 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.