Learning QGIS - Third Edition

Anita Graser

• Verlag: Packt Publishing
• Jahr: 2016
• ISBN:
  9781785888151
• Auflage: 3
• Thema: Computer Science
• Thema: Data Visualisation

The latest guide to using QGIS 2.14 to create great maps and perform geoprocessing tasks with easeAbout This Book• Learn how to work with various data and create beautiful maps using this easy-to-follow guide.• Give a touch of professionalism to your maps both for functionality and look and feel with the help of this practical guide.• A progressive hands-on guide that builds on a geo-spatial data and adds more reactive maps by using geometry tools.Who This Book Is ForThis book is great for users, developers, and consultants who know the basic functions and processes of GIS and want to learn to use QGIS to analyze geospatial data and create rich mapping applications. If you want to take advantage of the wide range of functionalities that QGIS offers, then this is the book for you.What You Will Learn• Install QGIS and get familiar with the user interface• Load vector and raster data from files, databases, and web services• Create, visualize, and edit spatial data• Perform geoprocessing tasks and automate them• Create advanced cartographic outputs• Design great print maps• Expand QGIS using PythonIn DetailQGIS 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.Style and approachA step by step approach to explain concepts of Geospatial map with the help of real life examples

Learning QGIS Third Edition

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Table of Contents

Learning QGIS Third Edition

Credits

About the Author

About the Reviewer

www.PacktPub.com

eBooks, discount offers, and more

Why subscribe?

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

1. Getting Started with QGIS

Installing QGIS

Installing QGIS on Windows

Installing on Ubuntu

Running QGIS for the first time

Introducing the QGIS user interface

Finding help and reporting issues

Summary

2. Viewing Spatial Data

Loading vector data from files

Dealing with coordinate reference systems

Loading raster files

Georeferencing raster maps

Loading data from databases

Loading data from OGC web services

Styling raster layers

Styling vector layers

Creating point styles – an example of an airport style

Creating line styles – an example of river or road styles

Creating polygon styles – an example of a landmass style

Loading background maps

Dealing with project files

Summary

3. Data Creation and Editing

Creating new vector layers

Working with feature selection tools

Selecting features with the mouse

Selecting features with expressions

Selecting features using spatial queries

Editing vector geometries

Using basic digitizing tools

Using advanced digitizing tools

Using snapping to enable topologically correct editing

Using measuring tools

Editing attributes

Editing attributes in the attribute table

Editing attributes in the feature form

Creating a feature form using autogenerate

Designing a feature form using drag and drop designer

Designing a feature form using a .ui file

Calculating new attribute values

Reprojecting and converting vector and raster data

Joining tabular data

Setting up a join in Layer Properties

Checking join results in the attribute table

Using temporary scratch layers

Checking for topological errors and fixing them

Finding errors with the Topology Checker

Fixing invalid geometry errors

Adding data to spatial databases

Summary

4. Spatial Analysis

Analyzing raster data

Clipping rasters

Analyzing elevation/terrain data

Using the raster calculator

Combining raster and vector data

Converting between rasters and vectors

Accessing raster and vector layer statistics

Computing zonal statistics

Creating a heatmap from points

Vector and raster analysis with Processing

Finding nearest neighbors

Converting between points, lines, and polygons

Identifying features in the proximity of other features

Sampling a raster at point locations

Mapping density with hexagonal grids

Calculating area shares within a region

Batch-processing multiple datasets

Automated geoprocessing with the graphical modeler

Documenting and sharing models

Leveraging the power of spatial databases

Selecting by location in SpatiaLite

Aggregating data in SpatiaLite

Summary

5. Creating Great Maps

Advanced vector styling

Creating a graduated style

Creating and using color ramps

Using categorized styles for nominal data

Creating a rule-based style for road layers

Creating data-defined symbology

Creating a dynamic heatmap style

Creating a 2.5D style

Adding live layer effects

Working with different styles

Labeling

Customizing label text styles

Controlling label formatting

Configuring label buffers, background, and shadows

Controlling label placement

Configuring point labels

Configuring line labels

Configuring polygon labels

Placing labels manually

Controlling label rendering

Designing print maps

Creating a basic map

Adding a scalebar

Adding a North arrow image

Adding a legend

Adding explanatory text to the map

Adding map grids and frames

Creating overview maps

Adding more details with attribute tables and HTML frames

Creating a map series using the Atlas feature

Presenting your maps online

Exporting a web map

Creating map tiles

Exporting a 3D web map

Summary

6. Extending QGIS with Python

Adding functionality using actions

Configuring your first Python action

Opening files using actions

Opening a web browser using actions

Getting to know the Python Console

Loading and exploring datasets

Styling layers

Filtering data

Creating a memory layer

Exporting map images

Creating custom geoprocessing scripts using Python

Writing your first Processing script

Writing a script with vector layer output

Visualizing the script progress

Developing your first plugin

Creating the plugin template with Plugin Builder

Customizing the plugin GUI

Implementing plugin functionality

Creating a custom map tool

Summary

Index

Learning QGIS Third Edition

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