OpenStreetMap (OSM) is a collaborative project to create a free editable ap of the world. The geodata underlying the map is considered the primary output of the project. The creation and growth of OSM has been motivated by restrictions on use or availability of map data across much of the world, and the advent of inexpensive portable satellite navigation devices

Since 2014 585,266 Buildings, 56,706 km of Roads , 9,705 km of Rivers , 4,821 Amenities including hospitals, schools etc have been added in Sierra Leone