Declassified Satellite Image Antartica (Free)
United States Geological Survey Professional Paper 1386-B
On 23 July 1972, the first Earth Resources Technology Satellite (ERTS 1 or Landsat 1) was successfully placed in orbit. The success of Landsat inaugurated a new era in satisfying mankind’s desire to better understand the dynamic world upon which we live. Space-based obser- vations have now become an essential means for monitoring global changes.