Landsat Missions

Landsat 2

Landsat 2 was launched onboard a Delta 2910 rocket from Vandenberg Air Force Base, California on January 22, 1975. Originally named ERTS-B (Earth Resource Technology Satellite B), the spacecraft was renamed Landsat 2 before launch. On February 25, 1982 after seven years of service, Landsat 2 was removed from operations due to yaw control problems; it was offically decommissioned on July 27, 1983.

 

Sketch of the Landsat 1-3 satellite.

Sketch of the Landsat 1-3 satellites.

Landsat 2, like its predecessor Landsat 1, orbited the the Earth in a sun-synchronous, near-polar orbit (99.2 degrees inclination) at a nominal altitude of 900 km (559 miles), circling the Earth every 103.34 minutes, completing 14 orbits per day. The satellite had a repeat cycle of 18 days and had an equatorial crossing time of 9:45 a.m. mean local time (+/- 15 minutes). 

Landsat 2 data were acquired on the Worldwide Reference System-1 (WRS-1) path/row system, with swath overlap (or sidelap) varying from 14 percent at the Equator to a maximum of approximately 85 percent at 81 degrees north or south latitude. 

Data products created from over 240,000 Landsat 2 MSS scenes are available to download from EarthExplorer, GloVis, and the LandsatLook Viewer

 

 

 

 

 

Landsat 2 Instruments

Landsat 2 carried the same sensors as Landsat 1: the Return Beam Vidicon (RBV) and the Multispectral Scanner System (MSS).

Return Beam Vidicon (RBV)

The RBV sensor utilized vidicon tube instruments containing an electron gun that read images from a photoconductive faceplate similar to television cameras. The data stream received from the satellite was analog-to-digital preprocessed to correct for radiometric and geometric errors. 

  • 80 meter-ground resolution
  • Three cameras operating in the following spectral bands:
    • Band 1 Visible blue-green (475-575 nm)
    • Band 2 Visible orange-red (580-680 nm)
    • Band 3 Visible red to Near-Infrared (690-830 nm)
  • Data recorded to 70 millimeter (mm) black and white film rolls
  • Data: 3.5 MHz FM video

RBV data was rarely used and considered useful for engineering evaluation purposes rather than science analysis. Visit RBV Film Only for more information. 

Multispectral Scanner (MSS)

The MSS sensors were line-scanning devices observing the Earth perpendicular to the orbital track. The cross-track scanning was accomplished by an oscillating mirror; six lines were scanned simultaneously in each of the four spectral bands for each mirror sweep. The forward motion of the satellite provided the along-track scan line progression.

  • 80-meter ground resolution in 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 (0.7 to 0.8 µm)
    • Band 7 Near-Infrared (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
  • Scene size: 170 km x 185 km (106 mi x 115 mi)

Visit Landsat 1-5 MSS for more information. 

 

Landsat 2 Spacecraft Facts

Landsats 1, 2, and 3 were modified Nimbus meteorlogical satellites. 

  • Weight: approximately 953 kg (2,100 lbs)
  • Overall height: 3 m (10 ft)
  • Diameter: 1.5 m (5 ft)
  • Solar array paddles extend out to a total of 4 m (13 ft)
  • 3-axis stabilized using 4 wheels to +/-0.7° attitude control
  • Twin solar array paddles (single-axis articulation)
  • S-Band and Very High Frequency (VHF) communications
  • Hydrazine propulsion system with 3 thrusters

 

Landsat 2 History (NASA Landsat Science)

The Multispectral Scanner (NASA Landsat Science)

Landsat Adds to World Memory - October 2011 (USGS)