The two Landsat satellites currently in orbit around the earth obtain images that are detailed enough to map land cover conditions, water movements, and urban growth. Landsat images are also commonly used to monitor natural hazards such as volcanoes and floods.
The Landsat satellites have imaged the earth since the early 1970s, providing the longest continuous global record of the earth’s surface. Currently there are two Landsat satellites in orbit, Landsat 5 and Landsat 7, that each image the entire earth every 16 days. GINA has operated a Landsat data receiving station since TKTK and works with the nationwide AmericaView program to provide Landsat images of Alaska.
For more information on Landsat visit NOAA’s Landsat pages.