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FIGURE 9. 1. Different sensor types
FIGURE 9.1. Different sensor types. A key distinction is made between passive sensors and active sensors. Passive sensors use only reflected electromagnetic radiation (EMR). Active sensors use emitted EMR. From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.2. Emitted and reflected electromagnetic energy that remote sensing sensors receive to create remote sensing data or images. From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.3. The electromagnet spectrum showing common examples and corresponding sizes to compare wavelengths. From From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.4. Examples of spectral signatures and wavelengths of reflected electromagnetic radiation. Note that a micrometer is one millionth of a meter. From From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9. 5. Illustration of different bandwidths used by Landsat 7
FIGURE 9.5. Illustration of different bandwidths used by Landsat 7. From From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.6. Comparison of spatial resolutions for aerial photography and Landsat 7 and most Landsat 8 bands. From From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.7. Multispectral sensors produce data and imagery to help monitor and model complex coastal changes. From From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.8. A composite of different multispectral data to produce a “picturelike” image of the world. From From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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FIGURE 9.9. Aerial imagery (here from a digitized aerial photograph) can show a great amount of detail. Some newer satellites have been able to record data at similar resolutions, but have been restricted by national laws and security concerns. From A Primer of GIS, 2nd edition, by Francis Harvey. Copyright by The Guilford Press.
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