LANDSAT 7 ETM SATELLITE IMAGE DATA

Landsat 7 ETM was launched on 15 April 1999 from the Western Test Range at Vandenberg Air Force Base in California.

Communications

Spacecraft

Power provided by a single Sun-tracking solar array and two 50 Ampere-Hour (AHr), Nickel Cadmium (NiCd) batteries, Attitude control provided through four reaction wheels (pitch, yaw, roll, and skew); three 2-channel gyros with celestial drift updating; a static Earth sensor; a 1750 processor; and torque rods and magnetometers for momentum uploading, Orbit control and backup momentum unloading provided through a blow-down monopropellant hydrazine system with a single tank containing 270 pounds of hydrazine, associated plumbing, and twelve 1-pound-thrust jets. Weight: approximately: 4,800 lbs (2,200 kg), Length: 4.3 m (14 ft), Diameter: 2.8 m (9 ft).

Orbit

Worldwide Reference System-2 (WRS-2) path/row system, Sun-synchronous orbit at an altitude of 705 km (438 mi), 233 orbit cycle; covers the entire globe every 16 days (except for the highest polar latitudes), Inclined 98.2° (slightly retrograde), Circles the Earth every 98.9 minutes, Equatorial crossing time: 10:00 a.m. +/- 15 minutes.

Sensors

Enhanced Thematic Mapper Plus (ETM+)

Eight spectral bands, including a pan and thermal band:

Ground Sampling Interval (pixel size): 30 m reflective, 60 m thermal

Added the Band 6 Low and High gain 60 m thermal bands

On-board calibration was added to Landsat 7: a Full Aperture Solar Calibrator (FASC) and a Partial Aperture Solar Calibrator (PASC), in addition to the 2 calibration lamps

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