Appendix | Practical GIS

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Table Of Contents

Practical GIS

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Practical GIS

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Overview of this book

The most commonly used GIS tools automate tasks that were historically done manually—compiling new maps by overlaying one on top of the other or physically cutting maps into pieces representing specific study areas, changing their projection, and getting meaningful results from the various layers by applying mathematical functions and operations. This book is an easy-to-follow guide to use the most matured open source GIS tools for these tasks. We’ll start by setting up the environment for the tools we use in the book. Then you will learn how to work with QGIS in order to generate useful spatial data. You will get to know the basics of queries, data management, and geoprocessing. After that, you will start to practice your knowledge on real-world examples. We will solve various types of geospatial analyses with various methods. We will start with basic GIS problems by imitating the work of an enthusiastic real estate agent, and continue with more advanced, but typical tasks by solving a decision problem. Finally, you will find out how to publish your data (and results) on the web. We will publish our data with QGIS Server and GeoServer, and create a basic web map with the API of the lightweight Leaflet web mapping library.

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

Setting Up Your Environment

Understanding GIS

Setting up the tools

Collecting some data

Summary

Accessing GIS Data With QGIS

Accessing raster data

Accessing vector data

Understanding map scales

Summary

Using Vector Data Effectively

Using the attribute table

Selecting features in QGIS

Modifying the attribute table

Understanding data providers

Summary

Creating Digital Maps

Styling our data

Understanding projections

Preparing a map

Creating a map

Summary

Exporting Your Data

Creating a printable map

Sharing raw data

Summary

Feeding a PostGIS Database

A brief overview of databases

Importing layers into PostGIS

Visualizing PostGIS layers in QGIS

Summary

A PostGIS Overview

Customizing the database

Optimizing queries

Backing up our data

Summary

Spatial Analysis in QGIS

Preparing the workspace

Vector analysis

Building your models

Using digital elevation models

Summary

Spatial Analysis on Steroids - Using PostGIS

Delimiting quiet houses

Matching the rest of the criteria

Querying rasters

Summary

A Typical GIS Problem

Outlining the problem

Raster analysis

Using fuzzy techniques in GIS

Calculating statistics

Creating an atlas

Summary

Showcasing Your Data

Spatial data on the web

Using QGIS for publishing

Using GeoServer

Summary

Styling Your Data in GeoServer

Managing styles

Writing SLD styles

Using CSS in GeoServer

Summary

Creating a Web Map

Understanding the client side of the Web

Creating web maps with Leaflet

Working with Leaflet plugins

Summary

Appendix

Appendix 1.1: Isosurfaces (800 mm and 1200 mm precipitation) visualized on the Digital Elevation Model of Slovakia provided by the sample slovakia3d dataset for GRASS GIS:

Appendix 1.2: The same map we created in Chapter 2, Accessing GIS Data With QGIS, only with a CRS using an Albers Conic projection (EPSG:102008). The map is not North-aligned; therefore, a north arrow was used with the North alignment parameter set to True north:

Appendix 1.3: Some of the basic geoalgorithms visualized. a: the two input layers (A and B per GRASS's v.overlay), b: clip (and), c: union (or), d: difference (nor), e: symmetrical difference (xor):

Appendix 1.4: Some of the Coordinate Reference System's PostGIS support. The selected one is the EPSG:4326 CRS used by the book in the early chapters: