6. Ruby

  • 6.36. Ruby CGI programming

    Ruby is a general language, not only a language for WEB development, but Ruby development in WEB applications and WEB tools ...
    2025-10-25 13:34:06 UTC
  • 6.37. Ruby CGI method

    The following is a list of methods for the CGI class: Serial number Method description 1 CGI::n...
    2025-10-25 13:34:02 UTC
  • 6.38. Ruby CGI Cookie

    The HTTP protocol is stateless. But for a commercial website, it needs to maintain session information between different pag...
    2025-10-25 13:33:59 UTC
  • 6.39. Ruby CGI Session

    CGI::Session Persistent session state can be saved for the user and the CGI environment, and the session needs to be clo...
    2025-10-25 13:34:05 UTC
  • 6.40. Ruby send email-SMTP

    SMTP (Simple Mail Transfer Protocol), or simple Mail transfer Protocol, is aset of rules for sending messages from source to...
    2025-10-25 13:34:05 UTC
  • 6.42. Ruby XML, XSLT and XPath tutorials

    6.42.1. What is XML? # XML refers to Extensible markup language. Extensible markup language, a subset of the standa...
    2025-10-25 13:33:59 UTC
  • 6.43. Ruby Web Service Application-SOAP4R

    6.43.1. What is SOAP? # Simple object access Protocol (SOAP) is a protocol specification for exchanging data. SOAP ...
    2025-10-25 13:34:00 UTC
  • 6.44. Ruby multithreading

    Every program running on the system is a process. Each process contains one or more threads. Thread is a single sequence c...
    2025-10-25 13:33:58 UTC
  • 6.45. Ruby JSON

    In this section we will show you how to use the Ruby language to encode and decode JSON objects. 6.45.1. Environment co...
    2025-10-25 13:33:59 UTC
  • 6.46. Ruby RubyGems

    RubyGems is a package manager for Ruby that provides a standard format for distributing Ruby programs and libraries, as well...
    2025-10-25 13:34:03 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。