3. Mongodb

  • 3.33. MongoDB overlay index query

    The official MongoDB documentation states that the override query is the following query: All quer...
    2025-10-25 12:32:56 UTC
  • 3.34. MongoDB query analysis

    MongoDB query analysis can ensure whether the index we have built is valid or not, and it is an important tool for que...
    2025-10-25 12:32:58 UTC
  • 3.35. MongoDB atomic operation

    Mongodb does not support transactions, so be aware of this when applying it to your project. No matter what the design...
    2025-10-25 12:32:59 UTC
  • 3.36. MongoDB Advanced Index

    Consider the following collection of documents (users): { "address": { "city": "Los Angeles", ...
    2025-10-25 12:33:02 UTC
  • 3.37. MongoDB index limit

    3.37.1. Extra expenses ¶ Each index occupies a certain amount of storag...
    2025-10-25 12:32:56 UTC
  • 3.38. MongoDB ObjectId

    We have used MongoDB’s object Id (ObjectId) in the previous chapters. In this chapter, we will learn about th...
    2025-10-25 12:32:57 UTC
  • 3.39. MongoDB Map Reduce

    Map-Reduce is a computing model that simply breaks down (MAP) a large number of work (data) and then merges the result...
    2025-10-25 12:32:57 UTC
  • 3.41. MongoDB regular expression

    A regular expression uses a single string to describe and match a series of strings that conform to a syntactic rule. ...
    2025-10-25 12:33:01 UTC
  • 3.42. MongoDB Management tool: Rockmongo

    RockMongo is a MongoDB management tool written by PHP5. Through Rockmongo you can manage MongoDB services, da...
    2023-12-15 23:00:02 UTC
  • 3.43. MongoDB GridFS

    GridFS is used to store and restore files (such as pictures, audio, video, etc.) that exceed the 16m (BSON file limit)...
    2025-10-25 12:33:00 UTC
  • 3.44. MongoDB fixed set (Capped Collections)

    MongoDB fixed set (Capped Collections) is a collection with excellent performance and fixed size. For a fixed size, we...
    2025-10-25 12:32:57 UTC
  • 3.45. Automatic growth of MongoDB

    MongoDB does not have the same automatic growth function as SQL, and MongoDB’s_ id is the 12-byte unique ID automatica...
    2025-10-25 12:33:01 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.