The chart below displays the number of scenes visible to all users on EarthExplorer as of April 30, 2014, and also compares the number available, to what was in the archive at the end of December 2013.
As expected, Landsat 8 and Landsat 7 acquisitions constantly increase the number of available scenes in the USGS archives. The Landsat Global Archive Consolidation (LGAC) effort has added more than 18,000 Landsat 4-5 TM scenes and more than 24,000 Landsat 1-5 MSS scenes to the USGS archives within the first four months of 2014.
This scene represents one of the path/rows from which most scenes were downloaded in April 2014.
Path 229 Row 82
Acquired January 13, 2014 by the Landsat 8 Operational Land Imager (OLI), this image shows the area of central Argentina, and the foothills of the Sierras Chicas Mountains. The urban area of Cordoba can be seen in the upper central portion of the image.
The entire Landsat archive became available to all users at no charge in December 2008. As of April 30, 2014, over 17 million scenes have been downloaded.