Remote sensing
Videos
Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation. The term is applied espec
Synthetic aperture radar image of Death Valley colored using polarimetry
Illustration of remote sensing
Estimates of changes in water storage around the Tigris and Euphrates Rivers, measured by NASA's GRACE satellites. The satellites measure tiny changes in gravitational acceleration, which can then be processed to reveal movement of water due to changes in its total mass.
The TR-1 reconnaissance/surveillance aircraft
Synthetic-aperture radar
Videos
Synthetic-aperture radar is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. SAR uses the motion of the radar antenna
This radar image acquired by the SIR-C/X-SAR radar on board the Space Shuttle Endeavour shows the Teide volcano. The city of Santa Cruz de Tenerife is visible as the purple and white area on the lower right edge of the island. Lava flows at the summit crater appear in shades of green and brown, while vegetation zones appear as areas of purple, green and yellow on the volcano's flanks.
The surface of Venus, as imaged by the Magellan probe using SAR, colorized with false color.
Depiction of the Spotlight Image Mode
Depiction of ScanSAR Imaging Mode