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Landsat 2 History
January 22, 1975 - February 25, 1982
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Figure 1. Landsat 2
Participants
- National Aeronautics and Space Administration (NASA)
- Department of Interior (DOI) (U.S. Geological Survey (USGS))
- Manufacturer: General Electric's Space Division in Valley Forge, PA
Launch
- Date: January 22, 1975
- Vehicle: Delta 2910
- Launched by: NASA
- Site: Vandenberg Air Force Base, CA
Spacecraft
- Weight: approximately 953 kg (2100 lbs)
- Overall height: 3m (10 ft)
- Diameter: 1.5m (5 ft)
- Solar array paddles extend out to a total of 4m (13 ft)
- 3-axis stabilized using 4 wheels to +/-0.7° attitude control
- Twin solar array paddles (single-axis articulation) provided 1000 W (BOL peak), 515 W (BOL ave)
- S-Band and Very High Frequencly (VHF) communications with 1 W transponder
- Hydrazine propulsion system with 3 thrusters
Communications
- Direct downlink from 2, 30 minute wide-band video tape recorders
- Data rate: 15 Mbps
- Quantisation: 6 bit (64 levels)
Orbit
- Worldwide Reference System-1 (WRS-1) path/row system
- Sun-synchronous, near-polar orbit at an altitude of 917 km (570 mi)
- Inclined at 99.2°
- Circled the Earth every 103 minutes
- Completed 14 orbits a day
- Repeat cycle: 18 days
- Swath width: 185 km (115 mi)
- Equatorial crossing time: 9:30 a.m. +/- 15 minutes
- Swath overlap (or sidelap) varied from 14 percent at the Equator to a maximum of approximately 85 percent at 81 degrees north or south latitude
Sensors
Return Beam Vidicon (RBV)
- The RBV system on Landsat 2 was operated primarily for engineering evaluation purposes and only occasional RBV imagery was obtained, primarily for cartographic uses in remote areas.
- 80-meter resolution in the multispectral band
- Three cameras that operate in the following spectral bands:
- Visible blue-green (475-575 nm)
- Visible orange-red (580-680 nm)
- Visible red to near-infrared (690-830 nm)
- Data: 3.5 MHz video
Multispectral Scanner (MSS)
- Four spectral bands :
- Band 4 Visible green (0.5 to 0.6 µm)
- Band 5 Visible red (0.6 to 0.7 µm)
- Band 6 Near Infrared (NIR) (0.7 to 0.8 µm)
- Band 7 NIR (0.8 to 1.1 µm)
- Six detectors for each spectral band provided six scan lines on each active scan
- Ground Sampling Interval (pixel size): 57 x 79 m
Other Characteristics
- Originally designated ERTS-B, then named Landsat-2 prior to launch, aka. ERTS-2
- Design Life: Minimum of 1 year
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U.S. Department of the Interior |
U.S. Geological Survey
