Assertion: synthetic aperture radar | /r/ObjectUse | used by nasa
Facets:
value: on jpl's seasat oceanographic satellite
type: LOCATION
value: in 1978
type: TEMPORAL
Source sentences:
text: Synthetic aperture radar was first used by NASA on JPL's Seasat oceanographic satellite in 1978 (this mission also carried an altimeter and a scatterometer); it was later developed more extensively on the Spaceborne Imaging Radar (SIR) missions on the space shuttle in 1981, 1984 and 1994.