Book Image

Learning QGIS - Third Edition

By : Anita Graser
Book Image

Learning QGIS - Third Edition

By: Anita Graser

Overview of this book

QGIS is a user-friendly open source geographic information system (GIS) that runs on Linux, Unix, Mac OS X, and Windows. The popularity of open source geographic information systems and QGIS in particular has been growing rapidly over the last few years. Learning QGIS Third Edition is a practical, hands-on guide updated for QGIS 2.14 that provides you with clear, step-by-step exercises to help you apply your GIS knowledge to QGIS. Through clear, practical exercises, this book will introduce you to working with QGIS quickly and painlessly. This book takes you from installing and configuring QGIS to handling spatial data to creating great maps. You will learn how to load and visualize existing spatial data and create data from scratch. You will get to know important plugins, perform common geoprocessing and spatial analysis tasks and automate them with Processing. We will cover how to achieve great cartographic output and print maps. Finally, you will learn how to extend QGIS using Python and even create your own plugin.
Table of Contents (13 chapters)
Learning QGIS Third Edition
About the Author
About the Reviewer

Editing attributes

There are three main use cases of attribute editing:

  • First, we might want to edit the attributes of a specific feature, for example, to fix a wrong name

  • Second, we might want to edit the attributes of a group of features

  • Third, we might want to change the attributes of all features within a layer

Editing attributes in the attribute table

All three use cases are covered by the functionality available through the attribute table. We can access it by going to Layer | Open Attribute Table, using the Open Attribute Table button present in the Attributes toolbar, or in the layer name context menu.

  1. To change an attribute value, we always have to enable editing first.

  2. Then, we can double-click on any cell in the attribute table to activate the input mode, as shown in the upper dialog of the following screenshot, where I am editing NAME_2 of the first feature:

  3. Pressing the Enter key confirms the change, but to save the new value permanently, we also have to click on the Save Edit(s) button...