![Collect Earth: An online tool for systematic reference data collection in land cover and use applications](/sites/default/files/public/styles/publication_feature_image/public/default_images/SERVIR_MEKONG_040816_Publication_Placeholder.jpg?itok=uu0PJSxn)
Land cover monitoring efforts are important for resource planning and ecosystem services in many countries. Collect Earth Online (CEO) is a new, free open source and user-friendly software tool for land monitoring. It is the product of a collaborative effort between NASA, Food and Agriculture Organization of the United Nations (FAO), US Forest Service and Google. This paper provides a full overview of CEO's structure and functionality.