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An image of Landsat-4, which was launched in 1982.
Credit: NASA. Download this image (JPG, 69.8 KB).
[02-Jan-07] Landsat 4 is the fourth satellite of the Landsat program. It was launched in 1982 with the primary goal of providing a global archive of satellite imagery. Landsat 4 carried an updated Multi-Spectral Scanner used on previous Landsat satellites, and a Thematic Mapper (TM). Scientists used TM data to derive the characteristics of tiny particles suspended in our atmosphere, known as aerosols.