The Geo-Wiki Project is a global network of volunteers who wish to help improve the quality of global land-cover maps. Because large differences occur between existing global land-cover maps, current ecosystem and land-use science lacks crucial accurate data (for example, to determine the potential of additional agricultural land available to grow crops in Africa).

Citizen scientists are asked to review hot spot maps of global land-cover disagreement and determine, based on what they actually see in Google Earth and their local knowledge, if the land-cover maps are correct or incorrect. Their input is recorded in a database, along with uploaded photos, to be used in the future for the creation of a new and improved global land-cover map.

The project works with a global network of volunteers to help classify land cover and improve satellite maps and data for research in climate, food security, and biofuels. The team has a number of related projects including a new mobile phone app, and a Facebook game, which function both as social networks and to provide data for the effort to improve land-cover data.