Data visualization and analysis has become an important task for many companies. Understanding the basic concepts of GIS and knowing how to visualize data on a map is a required ability for many professionals today. OpenLayers is a JavaScript library to load, display, and render maps from multiple sources on web pages. "OpenLayers Cookbook" teaches how to work with OpenLayers, one of the most important and complete open source JavaScript libraries. Through an extensive set of recipes, this book shows how to work with the main concepts required to build a GIS web application– maps, raster and vector layers, styling, theming, and so on. "OpenLayers Cookbook" includes problem solving and how-to recipes for the most common and important tasks. A wide range of topics are covered. The range of recipes includes: creating basic maps, working with raster and vector layers, understanding events and working with main controls, reading features from different data sources, styling features, and understanding the underlying architecture. "OpenLayers Cookbook" describes solutions and optimizations to problems commonly found.