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

Creating new vector layers

In this exercise, we'll create a new layer from scratch. QGIS offers a wide range of functionalities to create different layers. The New menu under Layer lists the functions needed to create new Shapefile and SpatiaLite layers, but we can also create new database tables using the DB Manager plugin. The interfaces differ slightly in order to accommodate the features supported by each format.

Let's create some new Shapefiles to see how it works:

  1. New Shapefile layer, which can be accessed by going to Layer | Create Layer or by pressing Ctrl + Shift + N, opens the New Vector Layer dialog with options for different geometry types, CRS, and attributes.

    • Creating a new Shapefile is really fast because all the mandatory fields already have default values. By default, the tool will create a new point layer in WGS84 (EPSG:4326) CRS (unless specified otherwise in Settings | Options | CRS) and one integer field called id.

  2. Leaving everything at the default values, we can simply...