This display requires that JavaScripts be enabled in your browser. For instructions, view
Close This Window
Instrument: ETM+ : Enhanced Thematic Mapper Plus
View entire text

Related Data Sets
View all records related to this instrument

The Landsat Enhanced Thematic Mapper Plus (ETM+) is a sensor carried onboard the Landsat 7 satellite and has acquired images of the Earth nearly continuously since July 1999, with a 16-day repeat cycle.

An instrument malfunction occurred on May 31, 2003; as a result, all Landsat 7 image data acquired from July 14, 2003 (20:32:40 GMT) to the present were collected in SLC-off mode. Image data acquired from 5/31/03 (21:42:35 GMT) to 7/14/03 (20:32:40 GMT) and from 9/3/03 (01:32:15 GMT) to 9/17/03 (06:22:27 GMT) are not available.

On April 1, 2007, the Landsat 7 mission began imaging in an alternate mirror-scanning control mode from the original Scan Angle Monitor (SAM) process that has been used since the satellite was launched in 1999. This change, known as Bumper Mode, is necessary due to a predictable physical wear of the mirror bumpers mounted within the Enhanced Thematic Mapper Plus (ETM+) imaging system. Landsat 7 data users should notice little or no change as a result of this transition. Five years ago, the Landsat 5 Thematic Mapper (TM) scanner was successfully converted to this alternate imaging mode, and customers have reported no problems related to that change.

Information provided by

Online Resources

Close This Window