Delivery of new Suomi National Polar-orbiting Partnership (Suomi NPP) satellite observations will cease on November 2, 2026. Data users should transition now to alternative products from NOAA-21 and NOAA-20.
Suomi NPP data announcement
The GEOS (Geodetic Earth Orbiting Satellite) Program developed three satellites for geodetic studies and for satellite-to-satellite tracking.
- GEOS 1 launched on November 6, 1965, and was a gravity-gradient-stabilized, solar-cell powered spacecraft that carried electronic and geodetic instrumentation. Also known as Explorer 29.
- GEOS 2 launched on January 11, 1968, and was identical to the GEOS 1 satellite. Also known as Explorer 36.
- GEOS 3 launched on April 9, 1975, and was later renamed the Geodynamics Experimental Ocean Satellite. GEOS 3 was an octahedron spacecraft, topped by a truncated pyramid, with a parabolic reflector for a radar altimeter on the flat bottom side.
Data
Type
Earth Observation Satellite
Objective
Geodetic studies and satellite tracking
Launch
GEOS-1 - Nov 06, 1965
GEOS-2 - Jan 11, 1968
GEOS-3 - Apr 9, 1975
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