The 'Landsat program' is the longest running enterprise for acquisition of imagery of Earth from space.

It is the eighth satellite in the Landsat program; the seventh to reach orbit successfully.

Landsat 4 is the fourth satellite of the Landsat program.

Landsat 6, equipped with upgraded versions of the instruments on its predecessor, was designed to continue the Landsat program.

Landsat 5 is the fifth satellite of the Landsat program.

Landsat 3 is the third satellite of the Landsat program.

An example of Earth observing sensors are the sensors in the Landsat program.

The Multispectral Scanner is one of the Earth observing sensors introduced in the Landsat program.

Landsat 2 is the second satellite of the Landsat program.

Landsat 7, launched on April 15, 1999, is the seventh satellite of the Landsat program.