13. Sass

  • 13.2. Sass installation

    In this chapter we mainly introduce the installation and use of Sass. 13.2.1. NPM installation ¶ We can use it. n...
    2025-10-25 13:32:21 UTC
  • 13.3. Sass variable

    Variables are used to store some information and can be reused. Sass variables can store the following information: ...
    2025-10-25 13:32:21 UTC
  • 13.5. Sass @ import

    Sass can help us reduce repetitive code in CSS and save development time. We can install different properties to create so...
    2025-10-25 13:32:22 UTC
  • 13.6. Sass @ mixin and @ include

    @mixin directive allows us to define a style that can be reused throughout the stylesheet. @include directive can ...
    2025-10-25 13:32:21 UTC
  • 13.7. Sass @ extend and inheritance

    @extend instruction tells Sass that the style of one selector is inherited from another selector. If one style is almo...
    2025-10-25 13:32:21 UTC
  • 13.8. Sass function

    Sass defines various types of functions that we can call directly through the CSS statement. Serial number Fun...
    2025-10-25 13:32:21 UTC
  • 13.12. Sass Map function

    Sass Map (mapping) objects are one or more pairs key/value to show. Sass Map is immutable, so it is processing Map ...
    2025-10-25 13:32:21 UTC
  • 13.13. Sass selector function

    The Sass selector function is used to view and process selectors. The following table lists the selector functions for Sas...
    2025-10-25 13:32:21 UTC
  • 13.14. Sass Introspection function

    Sass Introspection functions are rarely used to build stylesheets and are generally used for code debugging. The follo...
    2025-10-25 13:32:21 UTC
  • 13.1. Sass tutorial

    Sass (English full name: Syntactically Awesome Stylesheets) is a cascading stylesheet language originally designed by Ham...
    2025-10-25 13:35:45 UTC
  • 13.4. Sass nesting rules and attributes

    Sass nested CSS selectors are similar to HTML’s nesting rules. As follows, we nest the style of a navigation bar: ...
    2025-10-25 13:35:46 UTC
  • 13.10. Sass digital function

    The Sass numeric function is used to process some numeric values. The following table lists the numeric functions of Sass:...
    2025-10-25 13:35:45 UTC
  • 13.11. Sass list function

    The Sass list (List) function is used to process lists, access values in lists, add elements to lists, merge lists, and so o...
    2025-10-25 13:35:45 UTC
  • 13.15. Sass color function

    The Sass color function can be divided into three parts: color setting, color acquisition and color operation. The followi...
    2025-10-25 13:35:45 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.