The Earth Resources Observation Systems' Data Center of the US Geological Survey also maintains the Land Processes Distributed Active Archive Center to "process, archive, and distribute land-related data". The Center disseminates this data, collected by various satellite and aerial sensors, which include surface reflectances, land surface temperature, global geolocation angle, vegetation indices, thermal anomalies, leaf area index, net vegetation production, pointer files, and more. The data come in various forms and include complete descriptions as well as links to have it ordered or downloaded.