4. Lua

  • 4.1. Lua tutorial

    Lua is a lightweight and compact scripting language written in the standard C language and open in source code. It is d...
    2025-10-25 13:34:11 UTC

  • 4.2. Lua environment installation

    4.2.1. Install on Linux system # It is very easy to install Lua on Linux & Mac. You only need to download thesour...
    2025-10-25 13:34:11 UTC

  • 4.3. Lua basic syntax

    Lua is very easy to learn, and we can create the first Lua program! 4.3.1. The first Lua program # Interactive pro...
    2025-10-25 13:34:08 UTC

  • 4.4. Lua data type

    Lua is a dynamically typed language, variables do not need type definition, only need to assign values to variables. The val...
    2025-10-25 13:34:08 UTC

  • 4.5. Lua variable

    Before a variable can be used, it needs to be declared in the code, that is,to create the variable. Before the compiler ex...
    2025-10-25 13:34:12 UTC

  • 4.6. Lua cycle

    In many cases, we need to do some regular repetitive operations, so we need to repeat some statements in the program. A gr...
    2025-10-25 13:34:07 UTC

  • 4.7. Lua while cycle

    In Lua programming language, the while loop statement repeatedly executes the loop body statement when the condition...
    2025-10-25 13:34:11 UTC

  • 4.8. Lua for cycle

    In Lua programming language the for loop statement can repeat the specified statement, and the number of times can b...
    2025-10-25 13:34:11 UTC

  • 4.9. Lua repeat…until cycle

    In Lua programming language repeat...until , a loop statement is different from for and while cycle for ...
    2025-10-25 13:34:09 UTC

  • 4.10. Lua loop nesting

    Lua loop is allowed to be embedded in a loop in a programming language. The following example demonstrates Lua appli...
    2025-10-25 13:34:11 UTC

  • 4.11. Lua break statement

    Lua programing language break statement is inserted into the body of the loop to exit the current loop or statement ...
    2025-10-25 13:34:10 UTC

  • 4.12. Lua goto statement

    In Lua language goto statement allows the control flow to be transferred unconditionally to the marked statement. ...
    2025-10-25 13:34:07 UTC

  • 4.13. Lua process control

    Lua programming language flow control statements are set by the program to set one or more conditional statements. When ...
    2025-10-25 13:34:08 UTC

  • 4.14. Lua if statement

    Lua if statement consists of a Boolean expression as a conditional judgment, followed by other statements. 4.14.1. ...
    2025-10-25 13:34:11 UTC

  • 4.15. Lua if…else statement

    4.15.1. If…else statement # Lua if statement can be associated with the else statement is usedtogether, in ...
    2025-10-25 13:34:10 UTC

  • 4.16. Lua if nested statement

    4.16.1. If…else statement # Lua if statement allows nesting, which means that you can use a if or else if...
    2025-10-25 13:34:10 UTC

Principles and Applications of WebGIS

 37

Web框架

 942

WEB基础

 287

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.