This book is a comprehensive guide to all aspects of OpenStreetMap, the free world map.

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. It enables you
to use the constantly growing OSM data set and maps in your
own projects.

The book also 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.