Characteristics - Landsat 7
Summary of Landsat Missions and Dates
| Satellite | Launch Date | Sensors | Status |
|---|---|---|---|
| Landsat 1 | 7-23-72 | MSS and RBV | Expired 1-6-78 |
| Landsat 2 | 1-22-75 | MSS and RBV | Expired 2-5-82 |
| Landsat 3 | 3-5-78 | MSS and RBV | Expired 3-31-83 |
| Landsat 4 | 7-16-82 | TM and MSS | Sensors no longer operational since 7-87; satellite used for maneuver testing |
| Landsat 5 | 3-1-84 | TM and MSS | Operational |
| Landsat 6 | 10-5-93 | MSS and ETM | Lost at launch |
| Landsat 7 | 4-15-99 | ETM+ | Operational |
Landsat 7
Landsat 7 satellite is equipped with an Enhanced Thematic Mapper Plus (ETM+) instrument, developed by Raytheon Santa Barbara Remote Sensing in Santa Barbara, California. The Landsat 7 spacecraft is about 14 feet long (4.3 meters) and 9 feet (2.8 meters) in diameter. It consists of a spacecraft bus, built by Lockheed Martin Missiles and Space in Valley Forge, Pa., and the Enhanced Thematic Mapper Plus (ETM+) instrument.
The satellite orbits the Earth at an altitude of approximately 438 miles (705 kilometers) with a sun-synchronous 98-degree inclination and a descending equatorial crossing time of 10 a.m. LANDSAT Worldwide Reference System will be maintained with periodic adjustments for the life of the mission.
A three-axis attitude control subsystem stabilizes the satellite and keeps the instrument pointed toward Earth to within 0.05 degrees. The LANDSAT World-Wide-Reference system catalogues the worlds land mass into 57,784 scenes, each 115 miles (183 kilometers) wide by 106 miles (170 kilometers) long. The ETM+ will produce approximately 3.8GB of data for each scene, which is roughly equivalent to nearly 15 sets of encyclopedias at 29 volumes per set.
Sensitivity and Resolution Used on Landsat-7/ETM + Mission
| Sensor Landsat 7 | Spectral Sensitivity (µm) | Nominal Spectral Location |
Ground Resolution
(m) |
|---|---|---|---|
| Band 1 |
0.45 - 0.52
|
Blue
|
30 x 30
|
| Band 2 |
0.53 - 0.61
|
Green
|
30 x 30
|
| Band 3 |
0.63 - 0.69
|
Red
|
30 x 30
|
| Band 4 |
0.78 - 0.90
|
Near-IR
|
30 x 30
|
| Band 5 |
1.55 - 1.75
|
Mid-IR
|
30 x 30
|
| Band 6 |
10.4 - 12.5
|
Thermal-IR
|
60 x 60
|
| Band 7 |
2.09 - 2.35
|
Mid-IR
|
30 x 30
|
| Band 8 (Panchromatic) |
0.52 - 0.90
|
False color
|
15 x 15
|
