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- Landsat 4 is the fourth satellite of the Landsat program. It was launched on July 16th, 1982, with the primary goal of providing a global archive of satellite photos. Although the Landsat Program is managed by NASA, data from Landsat 4 was collected and distributed by the USGS. Landsat 4 is no longer in operation, due to technical failure. It finally ceased transmission in 1993, far beyond its designed life expectancy of five years. The satellite orbit continues to be maintained by NASA. Landsat 4 had a maximum transmission bandwidth of 85 Mbit/s, and carried an updated Multi-Spectral Scanner used on previous Landsats, and a Thematic Mapper. It had a maximum 30 m resolution. Shortly after launch, the satellite lost half of its solar power, prompting fears the satellite would fail sooner than expected. This prompted the early launch of Landsat 5, a satellite identical in specification to Landsat 4.
[Summary provided by NASA.]
Group: Platform_Details Entry_ID: LANDSAT-4 Group: Platform_Identification Platform_Category: Earth Observation Satellites Platform_Series_or_Entity: LANDSAT Short_Name: LANDSAT-4 End_Group Group: Platform_Associated_Instruments Short_Name: MSS Short_Name: TM End_Group Group: Orbit Orbit_Altitude: 705 km Orbit_Inclination: 98.2 degree Equator_Crossing: 9:45 AM (±15 min.) local time (descending node) Period: 99 minutes Repeat_Cycle: 16 days Orbit_Type: LEO > Low Earth Orbit > Polar Sun-Synchronous End_Group Creation_Date: 2007-02-01 Online_Resource: http://landsat.gsfc.nasa.gov/about/L4_td.html Sample_Image: http://upload.wikimedia.org/wikipedia/commons/thumb/4/4f/Landsat5.jpg/260px-Landsat5.jpg Group: Platform_Logistics Launch_Date: 1982-07-16 Launch_Site: Vandenberg Air Force Base, USA Design_Life: 5 Years Primary_Sponsor: NASA Primary_Sponsor: USGS End_Group End_Group
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