4. Lua

  • 4.1. Lua tutorial

    Lua is a lightweight and compact scripting language written in the standard C language and open in ...
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  • 4.2. Lua environment installation

    4.2.1. Install on Linux system # It is very easy to install Lua on Linu...
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  • 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 ...
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  • 4.4. Lua data type

    Lua is a dynamically typed language, variables do not need type definition, only need to assign values to variables. T...
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  • 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 th...
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  • 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. ...
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  • 4.7. Lua while cycle

    In Lua programming language, the while loop statement repeatedly e...
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  • 4.8. Lua for cycle

    In Lua programming language the for loop statement can repeat the ...
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  • 4.9. Lua repeat…until cycle

    In Lua programming language repeat...until , a loop statement is d...
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  • 4.10. Lua loop nesting

    Lua loop is allowed to be embedded in a loop in a programming language. The following example d...
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  • 4.11. Lua break statement

    Lua programing language break statement is inserted into the body of ...
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  • 4.12. Lua goto statement

    In Lua language goto statement allows the control flow to be trans...
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  • 4.13. Lua process control

    Lua programming language flow control statements are set by the program to set one or more cond...
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  • 4.14. Lua if statement

    Lua if statement consists of a Boolean expression as a conditional judgment, followed by oth...
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  • 4.15. Lua if…else statement

    4.15.1. If…else statement # Lua if stat...
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  • 4.16. Lua if nested statement

    4.16.1. If…else statement # Lua if stat...
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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.