Thanks to a comment on our facebook page: Due to the conflict in state finances in the U,S and A gesocientists are affected: data providers like the USGS and their websites like landcover.org and others are unavailable!
Looking Back Most people using GIS or remote sensing data came across the data obtained by the landsat satellite family. It all started with the Landsat 1 mission on July 23, 1972. The Landsat missions aquired millions of pictures which made available to public usage in 1992. Sensors developed and provided more and more details in terms of spectral and ground resolution.