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| Figure 6.1: | The Comunication data System |
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The ETM+ instrument on the Landsat 7 spacecraft contains sensors to detect earth scene radiation in three specific bands:
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visible and near infrared (VNIR) bands - bands 1,2,3,4,and 8 (PAN) with a spectral range between 0.4 and 1.0 micrometer.
- short wavelength infrared (SWIR) bands - bands 5 and 7 with a spectral range between 1.0 and 3.0 micrometer.
- thermal long wavelength infrared (LWIR) band - band 6 with a spectral range between 8.0 and 12.0 micrometer.
The ETM+ scanner contains 2 focal planes that collects, filters, and detects the scene radiation in a swath, 185 km wide, as it passes over the earth. The primary focal plane consists of optical filters, detectors, and preamplifiers for 5 of the 8 ETM+ spectral bands (bands 1-4, 8). The second focal plane is the cold focal plane which includes the optical filters, infrared detectors, and input stages for ETM+ spectral bands 5,6, and 7.