QGIS 2 Cookbook

coverpage

QGIS 2 Cookbook

Credits

About the Authors

About the Reviewers

www.PacktPub.com

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Preface

What this book covers

What you need for this book

Who this book is for

Sections

Conventions

Reader feedback

Customer support

Chapter 1. Data Input and Output

Introduction

Finding geospatial data on your computer

Describing data sources

Importing data from text files

Importing KML/KMZ files

Importing DXF/DWG files

Opening a NetCDF file

Saving a vector layer

Saving a raster layer

Reprojecting a layer

Batch format conversion

Batch reprojection

Loading vector layers into SpatiaLite

Loading vector layers into PostGIS

Chapter 2. Data Management

Introduction

Joining layer data

Cleaning up the attribute table

Configuring relations

Joining tables in databases

Creating views in SpatiaLite

Creating views in PostGIS

Creating spatial indexes

Georeferencing rasters

Georeferencing vector layers

Creating raster overviews (pyramids)

Building virtual rasters (catalogs)

Chapter 3. Common Data Preprocessing Steps

Introduction

Converting points to lines to polygons and back – QGIS

Converting points to lines to polygons and back – SpatiaLite

Converting points to lines to polygons and back – PostGIS

Cropping rasters

Clipping vectors

Extracting vectors

Converting rasters to vectors

Converting vectors to rasters

Building DateTime strings

Geotagging photos

Chapter 4. Data Exploration

Introduction

Listing unique values in a column

Exploring numeric value distribution in a column

Exploring spatiotemporal vector data using Time Manager

Creating animations using Time Manager

Designing time-dependent styles

Loading BaseMaps with the QuickMapServices plugin

Loading BaseMaps with the OpenLayers plugin

Viewing geotagged photos

Chapter 5. Classic Vector Analysis

Introduction

Selecting optimum sites

Dasymetric mapping

Calculating regional statistics

Estimating density heatmaps

Estimating values based on samples

Chapter 6. Network Analysis

Introduction

Creating a simple routing network

Calculating the shortest paths using the Road graph plugin

Routing with one-way streets in the Road graph plugin

Calculating the shortest paths with the QGIS network analysis library

Routing point sequences

Automating multiple route computation using batch processing

Matching points to the nearest line

Creating a routing network for pgRouting

Visualizing the pgRouting results in QGIS

Using the pgRoutingLayer plugin for convenience

Getting network data from the OSM

Chapter 7. Raster Analysis I

Introduction

Using the raster calculator

Preparing elevation data

Calculating a slope

Calculating a hillshade layer

Analyzing hydrology

Calculating a topographic index

Automating analysis tasks using the graphical modeler

Chapter 8. Raster Analysis II

Introduction

Calculating NDVI

Handling null values

Setting extents with masks

Sampling a raster layer