Mastering QGIS

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

• Publisher: Packt Publishing
• Year: 2015
• ISBN:
  9781784398682
• Topic: Informatica
• Subtopic: Sviluppo di applicazioni

Mastering QGIS

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Table of Contents

Mastering QGIS

Credits

Foreword

About the Authors

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

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

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

Tour of QGIS

QGIS Desktop

QGIS Browser

Loading data

Loading vector data

Loading raster data

Loading databases

Web services

Working with coordinate reference systems

Working with tables

Table joins

Editing data

Snapping

Styling vector data

Styling raster data

Contrast enhancement

Blending modes

Composing maps

Adding functionality with plugins

Summary

2. Creating Spatial Databases

Fundamental database concepts

Database tables

Table relationships

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 as a shapefile

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 the color picker

Color ramp

Color wheel

Color swatches

Color sampler

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

Add a ColorBrewer color ramp

Adding a cpt-city color ramp

Editing a color ramp

Styling single band 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

Vector layer rendering

Using diagrams to display thematic data

Parameters common to all diagram types

Diagram size parameters

Diagram position parameters

Adding attributes to diagrams

Creating a pie chart diagram

Creating a text chart diagram

Creating a histogram chart diagram

Saving, loading, and setting default styles

Saving a style

Loading a style

Setting and restoring a default style

Summary

4. Preparing Vector Data for Processing

Merging shapefiles

Creating spatial indices

Checking for geometry errors

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

Advanced field calculations

Exploring the field calculator interface

Writing advanced field calculations

The first example – calculating and formatting the current date

The second example – inserting geometric values

The third example – calculating a population-dependent label string

Complex spatial and aspatial queries

Summary

5. Preparing Raster Data for Processing

Reclassifying rasters

Converting datasets from floating-point to integer rasters

Resampling rasters

Installing and troubleshooting SAGA on different platforms

Windows

Mac OS X

Linux

Rescaling rasters

Creating a raster mosaic

Generating raster overviews (pyramids)

Converting between raster and vector data models

Converting from raster to vector

Converting from vector to raster (rasterize)

Creating raster surfaces via interpolation

Summary

6. Advanced Data Creation and Editing

Creating points from coordinate data

Mapping well-known text representations of geometry

Geocoding address-based data

How address geocoding works

The first example – geocoding using web services

The second example – geocoding using local street network data

Georeferencing imagery

Ground control points

Using the Georeferencer GDAL plugin

The first example – georef...