FieldScope is an interactive mapping platform provided by National Geographic that allows citizen scientists to share, analyze, and interpret location-based data with other enthusiasts. Using FieldScope, people can join projects, start new ones, or just explore the data that others have gathered. Using and contributing to FieldScope is free and requires no software downloads. Project contributors can simply add observations to the map as they collect them. Developers can retrieve, add, update, and delete observations programmatically via REST API.