5. Intermediate GIS Operations

This chapter introduces more intermediate GIS operations that you will most likely use in your work with QGIS.

• The first chapter covers spatial operations that manipulate data according to their spatial characteristics and distribution, such as clipping, buffering, dissolving, spatial joins, or selecting by location.

  • For example, you can select the hospitals within a certain distance of an area, or delete all the roads that are not within a part of the city.

• The second chapter introduces operations that manipulate the non-spatial information, such as table functions, non-spatial joins or non-spatial queries.

Chapter	Competences & Objectives
Chapter 1: Spatial Data Processing	At the end of this chapter, you should: know the spatial relationships, understand the concept of spatial joins, understand the geometrical operators used in QGIS.
Chapter 2: Overlay Operations (Clip, Dissolve, Buffer)	At the end of this chapter, you should: understand overlay operations in QGIS, know how to perform clipping, buffering, and dissolving operations, understand more advanced clipping operations.
Chapter 3: Centroids	At the end of this chapter, you should: know how to use centroids in QGIS.
Chapter 4: Non-Spatial processing	At the end of this chapter, you should: know how to use table functions, know how o perform non-spatial data queries, know how to perform non-spatial joins.
Exercises for Module 5	Here you can find all exercises for module 5.