Book Image


Book Image


Overview of this book

Imagine being able to create accurate maps that look how you want them to, and use them on the Web or in print, for free. OpenStreetMap allows exactly that, with no restrictions on how or where you use your maps. OpenStreetMap is perfect for businesses that want to include maps on their website or in publications without paying high fees. With this book in hand you have the power to make, alter, and use this geographical data in a collaborative way from anywhere on the Earth.OpenStreetMap was started because most maps you think of as free actually have legal or technical restrictions on their use, holding back people from using them in creative, productive, or unexpected ways. This book will allow you to take control of your own maps and use them smoothly. This book introduces the reader to the OpenStreetMap project and shows you how to participate in the project, and make use of the data it provides. No prior knowledge of the project is assumed, and technical details are kept to a minimum.In this book, you'll learn how easy it is to add your neighborhood to OpenStreetMap using inexpensive GPS equipment, or even no GPS at all. You'll find out how to communicate with other mappers working in the same area, and where to find more information about how to map the world around you.Once you have your area mapped, you'll learn how to turn this information into maps, whether for use in print or online, large or small, and with the details you want shown. The book describes several rendering methods, each suited to different types of map, and takes you through a tutorial on each one.
Table of Contents (17 chapters)
About the Author
About the Reviewers
How OpenStreetMap Records Geographical Features

Automatically updating local data from diffs

Planet files take a long time to download and process, so if you can avoid doing it every week, you'll save yourself a lot of time and bandwidth. Fortunately, Osmosis can help you by automating much of the work involved using its replication tasks.

Given a suitably configured system, Osmosis will download and apply all the changes to the data since a planet file was created, creating a copy that's almost as up-to-date as the main OpenStreetMap database. Run the same commands regularly, and, in theory, you will never need to download another planet file.

In this section, we'll see how to:

  • Prepare your system for replication

  • Run the initial update

  • Schedule further updates to your data

Preparing your system

Before you can update a planet file, you need to have done some preparation work. Osmosis stores information about the current state of your data in a few text files. We need a working directory in which to store the files, so let's create it. Open the...