As such, it is one of the early elements of NASA's Earth Observing less than half of the widely accepted estimates dating back to by NASA's Galileo spacecraft testify to the great age of the terrain, dating back Background information and educational context for the images can be found.
: Washington, DC: 1 : NASA uses the vantage point of space to increase our understanding of Earth and improve lives.
Astronaut Photography Background Astronauts have used hand-held cameras to photograph the Earth for more than 30 years, beginning with the Mercury missions in the early s.
An astronaut trained in the Earth sciences can rapidly identify and dating on earth nasa backgrounds interesting and unexpected phenomena, interpret what has been observed, and modify planned activities as needed.
Critical environmental monitoring sites are photographed repeatedly over time; some have photographic records dating back to the Gemini and Skylab missions.
Second, the unique aspects of handheld data make it possible to view the Earth in ways that are not common from other sensors. Photographic Characteristics Variability is both a key feature and a data extraction challenge for astronaut photography of Earth. Most nadir-viewing directly down at the Earth images have spatial resolution of 20 to 60 m.
At the Gateway to Astronaut Photography of EarthNASA provides interactive tools that can be used to estimate spatial resolution for a specific image Robinson et al, in press. The ability of the trained astronaut to rapidly identify and photograph interesting phenomena on the Earth makes the Shuttle photographs unique.