Book Image

QGIS 2 Cookbook

By : Alex Mandel, Víctor Olaya Ferrero, Anita Graser, Alexander Bruy
Book Image

QGIS 2 Cookbook

By: Alex Mandel, Víctor Olaya Ferrero, Anita Graser, Alexander Bruy

Overview of this book

QGIS is a user-friendly, cross-platform desktop geographic information system used to make maps and analyze spatial data. QGIS allows users to understand, question, interpret, and visualize spatial data in many ways that reveal relationships, patterns, and trends in the form of maps. This book is a collection of simple to advanced techniques that are needed in everyday geospatial work, and shows how to accomplish them with QGIS. You will begin by understanding the different types of data management techniques, as well as how data exploration works. You will then learn how to perform classic vector and raster analysis with QGIS, apart from creating time-based visualizations. Finally, you will learn how to create interactive and visually appealing maps with custom cartography. By the end of this book, you will have all the necessary knowledge to handle spatial data management, exploration, and visualization tasks in QGIS.
Table of Contents (19 chapters)
QGIS 2 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Geotagging photos


Newer cameras and phones with built-in GPS can be wonderful tools for data collection, as they help keep track of exactly where and when a picture was taken. However, not all cameras have a built-in GPS. You can add geotags afterwards, either with a GPS log from a separate GPS unit or just using a reference map and your memory or notes.

Getting ready

For this recipe, you'll need a some photos and either a GPS log (*.gpx), reference vector, reference raster, or coordinates. We've provided centerofcalifornia.jpg in the geotag folder, and the coordinates are in the image itself but also included as a point in centerofcalifornia.shp.

You will also need the Geotag photos plugin, which requires the exiftool program to be installed on your system. If exiftool didn't come with your install, you can easily get it from the Web at http://www.sno.phy.queensu.ca/~phil/exiftool/ or at package repositories (Linux).

How to do it…

This particular plugin assigns location per folder, so all photos...