Geography Reference
In-Depth Information
Examples of spectral signatures. Note that a micrometer is one millionth of a meter.
Source: http://rst.gsfc.nasa.gov/Intro/Part2_5.html
very-well-trained specialists to assess these factors and detect patterns in the
remote sensing data.
Bands
The detection of patterns is helped by the use of different ranges, or bands,
of EMR in sensing technology. Each band, as they are commonly called,
refers to a particular range of wavelength for that sensor. The bands avail-
able for a particular sensor depend greatly on the purpose of the sensor and
the technical characteristics of the sensor. Some sensors have only a few
bands in a narrow range of the total EMR, others are much broader. For
example, Landsat 7, the latest of the Landsat remote sensing satellites (dis-
cussed later in more detail), has seven bands:
Band 1: 0.45-0.52 µm Blue-Green
Band 2: 0.52-0.60 µm Green
Band 3: 0.63-0.69 µm Red
Band 4: 0.76-0.90 µm Near IR
Band 5: 1.55-1.75 µm Mid-IR
Band 6: 10.40-12.50 µm Thermal IR
Band 7: 2.08-2.35 µm Mid-IR
Figure 8.5 shows the different bands and how they can be combined for an
application.
Another widely used satellite, SPOT 5, offers a different set of band-
widths.
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