This book is a comprehensive guide to all aspects of OpenStreetMap, the free map of the world. OpenStreetMap (OSM) is a map of the whole world which can be used and edited freely by everyone. In a Wikipedia-like open community process, thousands of contributors world-wide survey the planet and upload their results to the OpenStreetMap database. This book Introduces you to the OpenStreetMap community, the data model, and the software used in the project. Enables you to use the constantly growing OSM data set and maps in your own projects. Explains in detail how you can help collecting and processing data for OpenStreetMap. If you want to become an OSM "Mapper" then this book is the ideal starting point.