8. Scala

  • 8.33. Scala tuple

    Like lists, tuples are immutable, but unlike lists, tuples can contain different types of elements. The values of tuples a...
    2025-10-25 13:35:17 UTC
  • 8.34. Scala Option

    The Scala Option (option) type is used to indicate that a value is optional (with or without value). Option[T] is a co...
    2025-10-25 13:35:12 UTC
  • 8.35. Scala classes and objects

    A class is an abstraction of an object, and an object is a concrete instanceof a class. Classes are abstract and do not take...
    2025-10-25 13:35:16 UTC
  • 8.36. Scala Iterator

    Scala Iterator is not a collection, it is a method for accessing the collection. Iterator it the two basic operati...
    2025-10-25 13:35:15 UTC
  • 8.38. Scala pattern matching

    Scala provides a powerful pattern matching mechanism and has a wide range ofapplications. A pattern match contains a serie...
    2025-10-25 13:35:12 UTC
  • 8.39. Scala regular expression

    Scala passed scala.util.matching in the bag Regex class to supportregular expressions. The following example demonst...
    2025-10-25 13:35:10 UTC
  • 8.40. Scala exception handling

    Scala’s exception handling is similar to other languages such as Java. Scala’s method can terminate the execution of the r...
    2025-10-25 13:35:16 UTC
  • 8.41. Scala extractor

    The extractor extracts the parameters that construct the object from the object passed to it. The Scala standard library c...
    2025-10-25 13:35:17 UTC
  • 8.42. Scala File I/O

    Scala performs file writing operations, directly using the I/O class in java ( java.io.File ): 8.42.1. Example # ...
    2025-10-25 13:35:14 UTC
《地理信息系统原理、技术与方法》  97

最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。