The U.S. Landsat Mission has collected remotely sensed imagery of the Earth's surface for more than 35 years. At present two satellites, Lanndsat-5 and Landsat-7, are in orbit and continuing to supply images and data for the many users of the information, but they are operating beyond their designed life and may fail at any time. Landsat has been used in a wide variety of applications, including climate research, natural resources management, commercial and municipal land development, public safety, homeland security and natural disaster management. This book presents information on Landsat and its valuable role in satellite imagery of Earth.