3. Mongodb

  • 3.17. MongoDB conditional operator

    3.17.1. Description ¶ The conditional operator is used to compare two expressions and get data from the mongoDB colle...
    2025-10-25 13:34:23 UTC
  • 3.18. MongoDB $type operator

    3.18.1. Description ¶ In this section, we will continue to discuss the conditional operator $type in MongoDB. The $...
    2025-10-25 13:34:24 UTC
  • 3.19. MongoDB Limit and Skip method

    3.19.1. MongoDB Limit() Method ¶ If you need to read a specified number of data records in MongoDB, you can use t...
    2025-10-25 13:34:23 UTC
  • 3.20. MongoDB sorting

    3.20.1. MongoDB sort() Method ¶ Use in MongoDB sort() Method to sort the data. The `` sort () `` meth...
    2025-10-25 13:34:24 UTC
  • 3.21. MongoDB index

    Indexes can usually greatly improve the efficiency of queries. If there is no index, MongoDB must scan each file in the coll...
    2025-10-25 13:34:22 UTC
  • 3.22. MongoDB aggregation

    Aggregate in MongoDB is mainly used to process data (such as statistical average, summation, etc.) and return the calculated...
    2025-10-25 13:34:21 UTC
  • 3.23. MongoDB replication (replica set)

    MongoDB replication is the process of synchronizing data on multiple servers. Replication provides redundant backup of dat...
    2025-10-25 13:34:25 UTC
  • 3.24. MongoDB fragmentation

    3.24.1. Slice ¶ There is another kind of cluster in Mongodb, that is, sharding technology, which can meet the needs o...
    2025-10-25 13:34:23 UTC
  • 3.25. MongoDB backup (mongodump) and recovery (mongorestore)

    3.25.1. MongoDB data backup ¶ In Mongodb, we use the mongodump command to back up MongoDB data. This command exports ...
    2025-10-25 13:34:21 UTC
  • 3.26. MongoDB monitoring

    After you have installed and deployed and allowed the MongoDB service, you must understand the operation of MongoDB and chec...
    2025-10-25 13:34:24 UTC
  • 3.27. MongoDB Java

    3.27.1. Environment configuration ¶ If you want to use MongoDB in the Java program, you need to make sure that the Ja...
    2025-10-25 13:34:22 UTC
  • 3.28. MongoDBPHP extension

    This tutorial will show you how to install MongoDB extensions on Linux, window, and Mac platforms. 3.28.1. Install the ...
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  • 3.29. MongoDB PHP

    To use mongodb in php, you must use mongodb’s php driver. For the installation of MongoDB PHP on each platform and the dow...
    2025-10-25 13:34:22 UTC
  • 3.30. Installation and use of PHP7 MongDB

    This tutorial is only suitable for PHP7 environment. If you are in PHP5 environment, you can refer to the PHP MongDB 安装与使用 ...
    2025-10-25 13:34:24 UTC
  • 3.31. MongoDB relation

    The relationship of MongoDB represents the logical interrelation between multiple documents. Relationships can be establis...
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  • 3.32. MongoDB database reference

    In the previous section of the MongoDB relationship, we mentioned the reference to MongoDB to standardize the data structure...
    2025-10-25 13:34:20 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.