Mastering QGIS - Second Edition
eBook - ePub

Mastering QGIS - Second Edition

Kurt Menke, GISP, Dr. Richard Smith Jr., GISP, Dr. Luigi Pirelli, Dr. John Van Hoesen, GISP

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  1. 486 pagine
  2. English
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eBook - ePub

Mastering QGIS - Second Edition

Kurt Menke, GISP, Dr. Richard Smith Jr., GISP, Dr. Luigi Pirelli, Dr. John Van Hoesen, GISP

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Go beyond the basics and unleash the full power of QGIS with practical, step-by-step examplesAbout This Book• This book is your one-stop solution to all of your GIS needs using the open source QGIS• Master QGIS by learning about database integration, geoprocessing tools, Python scripts, advanced cartography, and custom plugins• This example-rich, practical guide will help you create sophisticated analyses and mapsWho This Book Is ForIf you are a GIS professional, a consultant, a student, or perhaps a fast learner who wants to go beyond the basics of QGIS, then this book is for you. It will prepare you to realize the full potential of QGIS.What You Will Learn• Create and manage a spatial database• Get to know advanced techniques to style GIS data• Prepare both vector and raster data for processing• Add heat maps, live layer effects, and labels to your maps• Master LAStools and GRASS integration with the Processing Toolbox• Edit and repair topological data errors• Automate workflows with batch processing and the QGIS Graphical Modeler• Integrate Python scripting into your data processing workflows• Develop your own QGIS pluginIn DetailQGIS is an open source solution to GIS. It is widely used by GIS professionals all over the world. It is the leading alternative to the proprietary GIS software. Although QGIS is described as intuitive, it is also by default complex. Knowing which tools to use and how to apply them is essential to producing valuable deliverables on time.Starting with a refresher on the QGIS basics, this book will take you all the way through to creating your first custom QGIS plugin. From the refresher, we will recap how to create, populate, and manage a spatial database. You'll also walk through styling GIS data, from creating custom symbols and color ramps to using blending modes. In the next section, you will discover how to prepare vector, heat maps, and create live layer effects, labeling, and raster data for processing. You'll also discover advanced data creation and editing techniques.The last third of the book covers the more technical aspects of QGIS such as using LAStools and GRASS GIS's integration with the Processing Toolbox, how to automate workflows with batch processing, and how to create graphical models. Finally, you will see how to create and run Python data processing scripts and write your own QGIS plugin with pyqgis.By the end of the book, you will understand how to work with all the aspects of QGIS, and will be ready to use it for any type of GIS work.Style and approachThis step-by-step comprehensive guide will let you dig your teeth into working with spatial databases, creating your own QGIS plugins, and creating your own custom graphical models.

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Informazioni

Anno
2016
ISBN
9781786463623
Edizione
2

Mastering QGIS - Second Edition


Table of Contents

Mastering QGIS - Second Edition
Credits
Foreword
About the Authors
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. A Refreshing Look at QGIS
Release schedules
QGIS download and installation
Installing QGIS on Windows
Installing QGIS on Mac OS X
Installing QGIS on Ubuntu Linux
Installing QGIS only
Installing QGIS and other FOSSGIS packages
Installing QGIS on a Chromebook
Tour of QGIS
Familiarizing yourself with QGIS Desktop
User interface themes
Familiarizing yourself with QGIS Browser
Loading data into QGIS Desktop
Loading vector data
Loading raster data
Loading databases
Loading web services
Working with CRS
Working with tables
Creating table joins
Editing data
Snapping
Styling vector data
Styling raster data
Enhancing raster display with contrast enhancement
Blending modes
Composing maps
Adding functionality with plugins
Custom QGIS variables
Using Project level variables in the Print Composer
Using variables in data defined overrides
Using Layer level variables
Summary
2. Creating Spatial Databases
Fundamental database concepts
Describing database tables
Knowing about table relationships
Reviewing the basics of Structured Query Language
Creating a spatial database
Importing data into a SpatiaLite database
Importing KML into SpatiaLite
Importing a shapefile into SpatiaLite
Importing tables into SpatiaLite
Exporting tables out of SpatiaLite
Managing tables
Creating a new table
Renaming a table
Editing table properties
Deleting a table
Emptying a table
Creating queries and views
Creating a SQL query
Creating a spatial view
Dropping a spatial view
Summary
3. Styling Raster and Vector Data
Choosing and managing colors
Always-available color picker components
Changeable panels in color picker
Color ramp
Color wheel
Color swatches
Color sampler
Color picker components available in the Layers panel
Managing color ramps
Managing the QGIS color ramp collection
Renaming a color ramp
Removing a color ramp
Exporting a color ramp
Importing a color ramp
Adding a color ramp
Adding a Gradient color ramp
Adding a Random color ramp
Adding a ColorBrewer color ramp
Adding a cpt-city color ramp
Editing a color ramp
Styling singleband rasters
Paletted raster band rendering
Singleband gray raster band rendering
Singleband pseudocolor raster band rendering
Styling multiband rasters
Creating a raster composite
Raster color rendering
Raster resampling
Styling vectors
Single-symbol vector styling
Categorized vector styling
Graduated vector styling
Rule-based vector styling
Point-displacement vector styling
Inverted polygons vector styling
Heatmap vector styling
2.5 D vector styling
Vector layer rendering
Layer transparency
Layer blending mode
Feature blending mode
Control feature rendering order
Using diagrams to display thematic data
Parameters common to all diagram types
Diagram size parameters
Diagram placement parameters
Adding attributes to diagrams
Creating a pie chart diagram
Creating a text diagram
Creating a histogram chart diagram
Saving, loading, and setting default styles
Saving a style
Loading a style
Setting and restoring a default style
Adding and renaming styles in the current QGIS project
Summary
4. Preparing Vector Data for Processing
Merging shapefiles
Creating spatial indices
Checking for geometry errors
Check Geometries plugin
Converting vector geometries
Creating polygon centroids
Converting polygons to lines and lines to polygons
Creating polygons surrounding individual points
Extracting nodes from lines and polygons
Simplifying and densifying features
Converting between multipart and singlepart features
Adding geometry columns to an attribute table
Using basic vector geoprocessing tools
Spatial overlay tools
Using the Clip and Difference tools
Using the Intersect and Symmetrical Difference tools
Overlaying polygon layers with Union
Creating buffers
Generating convex hulls
Dissolving features
Defining coordinate reference systems
Understanding the PROJ.4 definition format
Defining a new custom coordinate reference system
Viewing a statistical summary of vector layers
Advanced field calculations
Exploring the field calculator interface
Writing advanced field calculations
The first example – calculating and formatting current date
The second example – calculating with geometry
The third example – calculating a population-dependent label string
Conditional formatting for attribute table cells
Complex spatial and aspatial queries
Summary
5. Preparing Rast...

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