Book Image

OpenStreetMap

Book Image

OpenStreetMap

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)
OpenStreetMap
Credits
About the Author
About the Reviewers
Preface
4
How OpenStreetMap Records Geographical Features
Index

Chapter 9. Getting Raw OpenStreetMap Data

We've looked at some small-scale uses of OpenStreetMap data covering a single village. This is fine up to a point, but you need larger amounts of data than this for any reasonably serious application. There are many ways of getting at the raw data in the OpenStreetMap database, depending on how much you want, how often you want it, and how much processing you're prepared to do yourself. The main methods are:

  • Planet files

  • The main OpenStreetMap API

  • The Extended API (XAPI)

Each of these provides data in a different way, each with advantages and disadvantages. We'll discuss these in this chapter, and you should get an idea of which method will suit your application best.

As all of these methods provide data using Extensible Markup Language (XML), it will help you understand some of the examples given if you have a basic understanding of XML, but it is possible to retrieve, process, and use OpenStreetMap data without ever seeing a single line of XML, provided...