The Ordnance Survey Features API provides a way to filter Ordnance Survey data for; buildings, roads, rivers, hospitals, playing fields and more. It allows you to generate new location based insight and contains OS MasterMap Topography Layer and others. OS Features returns a metadata document describing the WFS service, returns a description of the attributes for each feature type, returns a selection of a specific feature from WFS plus other features. This API enables access to detailed geometries and attribution that is based on the OGC standard Web Feature Service and works with several GIS software and web mapping libraries. Ordnance Survey is a British mapping agency that provides data and information about geography, GI and mapping.