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Home > Programming > Geospatial Analysis > Mastering QGIS
Mastering QGIS
Mastering QGIS

Mastering QGIS: Go beyond the basics and unleash the full power of QGIS with practical, step-by-step examples , Second Edition

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Mastering QGIS

Chapter 2. Creating Spatial Databases

This chapter covers the creation and editing of spatial databases using QGIS. The core concepts of databases will be briefly reviewed; however, we have assumed that you are generally familiar with database concepts and SQL for most of the content covered in this chapter. The topics that we will cover in this chapter are as follows:

  • Core concepts of database construction
  • Creating spatial databases
  • Importing and exporting data
  • Editing databases
  • Creating queries
  • Creating views

Fundamental database concepts

A database is a structured collection of data. Databases provide multiple benefits over data stored in a flat file format, such as a shapefile or KML. These benefits include complex queries, complex relationships, scalability, security, data integrity, and transactions, to name a few. Using databases to store geospatial data is relatively easy, considering the aforementioned benefits.

Note

There are multiple types of database; however, the most common type of database, and the type of database that this chapter will cover, is the relational database.

Describing database tables

A relational database stores data in tables. A table is composed of rows and columns, where each row is a single data record and each column stores a field value associated with each record. A table can have any number of records; however, each field is uniquely named and stores a specific type of data.

A data type restricts the information that can be stored in a field, and it is very important...

Creating a spatial database

Creating a spatial database in QGIS is a simple operation. QGIS supports PostGIS, SpatiaLite, MSSQL, SQL Anywhere, and Oracle Spatial databases. We will cover SpatiaLite, an open source project that is cross-platform, simple, and lightweight, and provides quite a bit of functionality. SpatiaLite is a spatial database management system (DBMS) built on top of SQLite, a lightweight personal DBMS.

Note

SpatiaLite (and thus, SQLite) is built on a single-user architecture, which makes installation and management virtually nonexistent. The trade-off, however, is that it neither does a good job of supporting multiple concurrent connections, nor does it support a client-server architecture. For a more complex DBMS, PostGIS is an excellent open source option.

We will create a new SpatiaLite database that we will use for the remaining exercises in this chapter; to do this, perform the following steps:

  1. Open QGIS Desktop and open the Browser panel. If the Browser panel is missing...

Importing data into a SpatiaLite database

Importing data into a SpatiaLite database is easy using the DB Manager. SpatiaLite supports the following commonly-used formats, as well as many other formats, for importing files:

  • Shapefile (.shp)
  • dBase (.dbf)
  • Text (.txt), Commas Separate Values (.csv), and Excel spreadsheets (.xls/.xlsx)
  • AutoCAD DXF (.dxf)
  • Geography Markup Language (.gml)
  • Keyhole Markup Language (.kml)
  • Geometry JavaScript Object Notation (.geojson)
  • Scalable Vector Graphics (.svg)

Let's use DB Manager to import data in a few different formats into our GiffordPinochet.sqlite database.

Importing KML into SpatiaLite

To import a KML file into a SpatiaLite database, complete the following steps:

  1. Open DB Manager by clicking on DB Manager under Database. Expand SpatiaLite and select GiffordPinochet.sqlite on the Tree panel.
  2. Navigate to Table | Import layer/file to open the Import vector layer dialog.
  3. Click on the ellipsis button at the right-hand side of the Input drop-down box. Choose Keyhole...

Exporting tables out of SpatiaLite

You can export tables from SpatiaLite to many different formats using DB Manager. Tables can be exported to the following commonly-used formats, as well as many other formats:

  • ESRI Shapefile (.shp)
  • dBase (.dbf)
  • Text (.txt), Commas Separate Values (.csv), and Excel spreadsheets (.xls/.xlsx)
  • AutoCAD DXF (.dxf)
  • Geography Markup Language (.gml)
  • Keyhole Markup Language (.kml)
  • Geometry JavaScript Object Notation (.geojson)
  • GeoRSS (.xml)

To demonstrate an export, export the Waterfalls table to the shapefile format by performing the following steps:

  1. Open DB Manager by clicking on DB Manager under Database. Expand SpatiaLite and select the database from which you wish to export a table in the Tree panel.
  2. In the Tree panel, select the table that you wish to export.
  3. Navigate to Table | Export to file to open the Export to vector file dialog.
  4. In the Format dropdown box, choose ESRI Shapefile.
  5. Click on the ellipsis button at the right-hand side of the Output file text box and name...

Managing tables

DB Manager provides functions to create, rename, edit, delete, and empty tables using tools found under the Table menu. In this section, we will discuss each tool.

Creating a new table

Creating new tables using DB Manager is fairly straightforward. When creating a new table, you can specify whether it will be a spatial table or a nonspatial table. In this section, we will create a new spatial table in SpatiaLite to hold data about mountain peaks in a park; to do this, perform the following steps:

Tip

To quickly create a new SpatiaLite layer (and optionally a database) in one dialog box in QGIS Desktop, navigate to Layer | Create Layer | New SpatiaLite Layer….

  1. Open DB Manager by clicking on DB Manager under Database. Expand SpatiaLite and select GiffordPinochet.sqlite in the Tree panel.
  2. Navigate to Table | Create Table to open the Create Table window.
  3. Enter Peaks as the table name.
  4. Click on the Add field button to add a new table field. A new row will appear in the field list...

Fundamental database concepts

A database is a structured collection of data. Databases provide multiple benefits over data stored in a flat file format, such as a shapefile or KML. These benefits include complex queries, complex relationships, scalability, security, data integrity, and transactions, to name a few. Using databases to store geospatial data is relatively easy, considering the aforementioned benefits.

Note

There are multiple types of database; however, the most common type of database, and the type of database that this chapter will cover, is the relational database.

Describing database tables

A relational database stores data in tables. A table is composed of rows and columns, where each row is a single data record and each column stores a field value associated with each record. A table can have any number of records; however, each field is uniquely named and stores a specific type of data.

A data type restricts the information that can be stored in a field, and it is very important...

Creating a spatial database

Creating a spatial database in QGIS is a simple operation. QGIS supports PostGIS, SpatiaLite, MSSQL, SQL Anywhere, and Oracle Spatial databases. We will cover SpatiaLite, an open source project that is cross-platform, simple, and lightweight, and provides quite a bit of functionality. SpatiaLite is a spatial database management system (DBMS) built on top of SQLite, a lightweight personal DBMS.

Note

SpatiaLite (and thus, SQLite) is built on a single-user architecture, which makes installation and management virtually nonexistent. The trade-off, however, is that it neither does a good job of supporting multiple concurrent connections, nor does it support a client-server architecture. For a more complex DBMS, PostGIS is an excellent open source option.

We will create a new SpatiaLite database that we will use for the remaining exercises in this chapter; to do this, perform the following steps:

  1. Open QGIS Desktop and open the Browser panel. If the Browser panel is missing...

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Page 1 of 8

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Key benefits

  • •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 maps

Description

QGIS 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.

Who is this book for?

If 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 plugin

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 30, 2016
Length: 486 pages
Edition : 2nd
Language : English
ISBN-13 : 9781786463623
Category :
Programming
Concepts :
Geospatial Analysis
Tools :
QGIS

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Publication date : Sep 30, 2016
Length: 486 pages
Edition : 2nd
Language : English
ISBN-13 : 9781786463623
Category :
Programming
Concepts :
Geospatial Analysis
Tools :
QGIS

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Table of Contents

12 Chapters
1. A Refreshing Look at QGIS Chevron down icon Chevron up icon
1. A Refreshing Look at QGIS
Release schedules
QGIS download and installation
Tour of QGIS
Loading data into QGIS Desktop
Working with CRS
Working with tables
Editing data
Composing maps
Adding functionality with plugins
Summary
2. Creating Spatial Databases Chevron down icon Chevron up icon
2. Creating Spatial Databases
Fundamental database concepts
Creating a spatial database
Importing data into a SpatiaLite database
Exporting tables out of SpatiaLite
Managing tables
Creating queries and views
Summary
3. Styling Raster and Vector Data Chevron down icon Chevron up icon
3. Styling Raster and Vector Data
Choosing and managing colors
Managing color ramps
Styling singleband rasters
Styling multiband rasters
Creating a raster composite
Raster color rendering
Raster resampling
Styling vectors
Vector layer rendering
Using diagrams to display thematic data
Saving, loading, and setting default styles
Summary
4. Preparing Vector Data for Processing Chevron down icon Chevron up icon
4. Preparing Vector Data for Processing
Merging shapefiles
Creating spatial indices
Checking for geometry errors
Converting vector geometries
Using basic vector geoprocessing tools
Defining coordinate reference systems
Viewing a statistical summary of vector layers
Advanced field calculations
Conditional formatting for attribute table cells
Complex spatial and aspatial queries
Summary
5. Preparing Raster Data for Processing Chevron down icon Chevron up icon
5. Preparing Raster Data for Processing
Reclassifying rasters for analysis
Rescaling raster values
Aligning raster pixels
Creating a raster mosaic
Generating raster overviews (pyramids)
Converting between raster and vector data models
Creating raster surfaces via interpolation
Summary
6. Advanced Data Creation and Editing Chevron down icon Chevron up icon
6. Advanced Data Creation and Editing
Creating points from coordinate data
Geocoding address-based data
Georeferencing imagery
Checking the topology of vector data
Repairing topological errors via topological editing
Summary
7. Advanced Data Visualization Chevron down icon Chevron up icon
7. Advanced Data Visualization
Learn to use live layer effects
Creating beautiful effects with inverted polygon shapeburst fills
Creating 3D views with QGIS2ThreeJS
Creating an Atlas
Summary
8. The Processing Toolbox Chevron down icon Chevron up icon
8. The Processing Toolbox
About the Processing Toolbox
Performing raster analyses with GRASS
SAGA
Exploring hydrologic analyses with TauDEM
R
LAStools and Fusion
Summary
9. Automating Workflows with the Graphical Modeler Chevron down icon Chevron up icon
9. Automating Workflows with the Graphical Modeler
An introduction to the graphical modeler
Opening the graphical modeler
Configuring the modeler and naming a model
Adding data inputs to your model
Adding algorithms to your model
Running a model
Editing a model
Documenting a model
Saving, loading, and exporting models
Executing model algorithms iteratively
Nesting models
Using batch processing with models
Converting a model into a Python script
Summary
10. Creating QGIS Plugins with PyQGIS and Problem Solving Chevron down icon Chevron up icon
10. Creating QGIS Plugins with PyQGIS and Problem Solving
Webography – where to get API information and PyQGIS help
The Python Console
My second PyQGIS code snippet – looping the layer features
Exploring iface and QGis
Exploring a QGIS API in the Python Console
Creating a plugin structure with Plugin Builder
A simple plugin example
Setting up a debugging environment
Debugging session example
Summary
11. PyQGIS Scripting Chevron down icon Chevron up icon
11. PyQGIS Scripting
Where to learn Python basics
How to load layers
Vector structure
Iterating over features
Editing features
Running Processing Toolbox algorithms
Running an external algorithm or command
Interacting with the map canvas
Summary
Index Chevron down icon Chevron up icon
Index

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.5
(4 Ratings)
5 star 50%
4 star 50%
3 star 0%
2 star 0%
1 star 0%
Maya Aug 04, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
good book to learn gis
Amazon Verified review Amazon
RAFAEL VÁZQUEZ MÁRQUEZ Nov 03, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
A pesar de que es un libro de nivel intermedio, trae un capitulo breve de introducción, los capitulos estan muy bien explicados.
Amazon Verified review Amazon
Grumpy Jun 22, 2019
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Mine said for sale in India on the cover, but it's a decent intro to qgis
Amazon Verified review Amazon
Lance Case Sep 18, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Highly recommend this for anyone serious about learning how to use QGIS. Online tutorials and user forums will only get you so far. This book steps through most, if not all, of the features of the application. It's perfect for a general introduction to the software and provides a nice starting point for your specific application. My only complaint is that the printed book is in black & white with an option to download color pictures from the publisher. The PDF version is in full color. I like having a physical book for reference, but some of the graphic examples don't work in black & white.
Amazon Verified review Amazon

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About the 5 authors

Left arrow icon
Profile icon Corti
Corti
Paolo Corti is an environmental engineer with 20 years of experience in the GIS field, currently working as a Geospatial Engineer Fellow at the Center for Geographic Analysis at Harvard University. He is an advocate of open source geospatial technologies and Python, an OSGeo Charter member, and a member of the pycsw and GeoNode Project Steering Committees. He is a coauthor of the first edition of this book and the reviewer for the first and second editions of the Mastering QGIS book by Packt.
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Profile icon Kurt Menke, GISP
Kurt Menke, GISP
LinkedIn icon
Kurt Menke, a certified GIS Professional (GISP), has been working in the GIS field since 1997. Prior to this, he worked as a professional archaeologist for 10 years in the American Southwest. He earned a master's degree (MA) in Geography from the University of New Mexico in 2000. That same year, he founded Bird's Eye View (www.BirdsEyeViewGIS.com) to apply his expertise with the GIS technology to the World's mounting ecological and social problems. Towards this end, Mr. Menke's work focuses largely on wildlife conservation and public health. His specialties are spatial analysis, modeling, and cartography. He is a longtime advocate of FOSS4G. He began writing MapServer applications in 2001 and has been using QGIS since 2007. He is one of the coauthors of the curriculum at the FOSS4G Academy
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Profile icon Van Hoesen, GISP
Van Hoesen, GISP
John Van Hoesen, GISP, is an associate professor of geology and environmental studies at Green Mountain College in rural west-central Vermont, USA. He has an MS and a Ph.D. in geology from the University of Nevada, Las Vegas. He is a certified GISP with a broad background in the geosciences and has used some flavor of GIS to evaluate and explore geological processes and environmental issues. John has taught graduate, undergraduate, and continuing education courses using some variants of FOSS GIS since 2003.
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Profile icon Pirelli
Pirelli
Luigi Pirelli is a QGIS developer and software analyst with a degree in computer science from Bari University. He has worked in the Satellite Ground Segment and Direct Ingestion for the European Space Agency. He is involved in GFOSS world, contributing in QGIS, GRASS, & MapServer core, and developing QGIS plugins. Luigi is the founder of the OSGEO Italian local GFOSS chapter. He has taught PyQGIS, delivered training from basic to advanced levels, and supported companies to develop their own QGIS plugins. He founded a local hackerspace group-Bricolabs.cc. He likes training groups on conflict resolution. He contributed to the Lonely Planet guide Cycling Italy.
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Profile icon Smith Jr., GISP
Smith Jr., GISP
Richard Smith Jr., GISP, is an asst. professor of geographic information science in the School of Engineering and Computing Sciences at Texas A&M University, Corpus Christi. He has a Ph.D. in geography from the University of Georgia, MSc in computer science, and BSc in geographic information science from Texas A&M University, Corpus Christi. He researches in cartography, systems integration, and the use of geospatial technology for disaster response. He is an advocate for FOSS4G and building a FOSS4G curriculum. He is a co-author of the FOSS4G Academy.
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How do I buy and download an eBook? Chevron down icon Chevron up icon

Where there is an eBook version of a title available, you can buy it from the book details for that title. Add either the standalone eBook or the eBook and print book bundle to your shopping cart. Your eBook will show in your cart as a product on its own. After completing checkout and payment in the normal way, you will receive your receipt on the screen containing a link to a personalised PDF download file. This link will remain active for 30 days. You can download backup copies of the file by logging in to your account at any time.

If you already have Adobe reader installed, then clicking on the link will download and open the PDF file directly. If you don't, then save the PDF file on your machine and download the Reader to view it.

Please Note: Packt eBooks are non-returnable and non-refundable.

Packt eBook and Licensing When you buy an eBook from Packt Publishing, completing your purchase means you accept the terms of our licence agreement. Please read the full text of the agreement. In it we have tried to balance the need for the ebook to be usable for you the reader with our needs to protect the rights of us as Publishers and of our authors. In summary, the agreement says:

  • You may make copies of your eBook for your own use onto any machine
  • You may not pass copies of the eBook on to anyone else
How can I make a purchase on your website? Chevron down icon Chevron up icon

If you want to purchase a video course, eBook or Bundle (Print+eBook) please follow below steps:

  1. Register on our website using your email address and the password.
  2. Search for the title by name or ISBN using the search option.
  3. Select the title you want to purchase.
  4. Choose the format you wish to purchase the title in; if you order the Print Book, you get a free eBook copy of the same title. 
  5. Proceed with the checkout process (payment to be made using Credit Card, Debit Cart, or PayPal)
Where can I access support around an eBook? Chevron down icon Chevron up icon
  • If you experience a problem with using or installing Adobe Reader, the contact Adobe directly.
  • To view the errata for the book, see www.packtpub.com/support and view the pages for the title you have.
  • To view your account details or to download a new copy of the book go to www.packtpub.com/account
  • To contact us directly if a problem is not resolved, use www.packtpub.com/contact-us
What eBook formats do Packt support? Chevron down icon Chevron up icon

Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.