Landsat Missions

Landsat 3

Landsat 3 (orginally named Landsat C) was launched into space onboard a Delta 2910 rocket from Vandenberg Air Force Base, California on March 5, 1978. The objective of Landsat 3 was to extend the period of space-acquired Earth imagery, started by Landsat 1 and Landsat 2.The satellite was placed in standy mode on March 31, 1983 and decommissioned on September 7, 1983. 

Sketch of the Landsat 1-3 satellite.

Sketch of the Landsat 1-3 satellites. 

Landsat 3, like Landsat 1 and Landsat 2, orbited the the Earth in a sun-synchronous, near-polar orbit (99.2 degrees inclination) at a nominal altitude of 917 km (570 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 9:30 a.m. mean local time (+/- 15 minutes). 

Landsat 3 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 140,000 Landsat 3 MSS scenes are available to download from EarthExplorerGloVis, and the LandsatLook Viewer

 

 

 

 

Landsat 3 Instruments

Landsat 3 carried the modificed versions of the sensors placed on Landsat 1 and Landsat 2: 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. 

The RBV system was redesigned for Landsat 3 to use two cameras, mounted side-by-side, with panchromatic spectral response and higher spatial resolution than on Landsat 1 and Landsat 2, to complement the multispectral coverage provided by the MSS. Each of the cameras produced a swath of about 90 km (for a total swath of 180 km).

  • 40-meter-ground resolution
  • Two cameras operating in one broad spectral band (green to near-infrared; 0.505–0.750 µm) 
  • 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 sensor was a line-scanning device 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. The MSS sensor on Landsat 3 originally had five spectral bands, but one failed shortly after launch. 

  • 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 3 Spacecraft Facts

  • Manufactured by General Electric (GE) Astrospace
  • 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 3 History (NASA Landsat Science)

The Multispectral Scanner (NASA Landsat Science)

Landsat Adds to World Memory - October 2011 (USGS)