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Mastering QGIS

You're reading from Mastering QGIS Go beyond the basics and unleash the full power of QGIS with practical, step-by-step examples

Product type Paperback

Published in Sep 2016

Publisher Packt

ISBN-13 9781786460370

Length 486 pages

Edition 2nd Edition

Tools

QGIS

Concepts

Geospatial Analysis

Authors (5):

John Van Hoesen, GISP

Kurt Menke, GISP

Paolo Corti

Richard Smith Jr., GISP

Luigi Pirelli

+1 more

View More author details

Table of Contents (13) Chapters

Preface

1. A Refreshing Look at QGIS FREE CHAPTER

2. Creating Spatial Databases

3. Styling Raster and Vector Data

4. Preparing Vector Data for Processing

5. Preparing Raster Data for Processing

6. Advanced Data Creation and Editing

7. Advanced Data Visualization

8. The Processing Toolbox

9. Automating Workflows with the Graphical Modeler

10. Creating QGIS Plugins with PyQGIS and Problem Solving

11. PyQGIS Scripting

Index

Converting between raster and vector data models

QGIS provides tools to convert between raster and vector data models. In this section, we will convert between the two data models using a national land cover dataset of 2006 for the Dallas area in Texas.

Converting from raster to vector

To convert a raster to a vector format, QGIS provides the Polygonize tool. The Polygonize tool converts an input raster file into any supported type of vector file and writes the raster cell values to a field in the vector file. When the raster is polygonized, adjacent cells of the same value are aggregated to a single larger polygon.

To access the Polygonize tool, click on Polygonize (Raster to vector) by navigating to Raster | Conversion. The Polygonize tool is shown in the following screenshot and uses the sample Dallas Land Cover.tif file as input:

To convert a raster to a vector polygon, the following options are available:

Input file (raster): Input file to be polygonized.
Output file for polygons (shapefile...

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Authors (5)

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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Kurt Menke, GISP

Kurt Menke, GISP

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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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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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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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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