Remote Sensing Gis

Download Computer Processing of Remotely-Sensed Images: An by Paul M. Mather PDF

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By Paul M. Mather

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The temporal resolution is also influenced by the swath width, which is the length on the ground equivalent to one scan line. Landsat TM/ETM+ has a swath width of 185 km whereas the AVHRR sensor carried by the NOAA satellites has a swath width of approximately 3000 km. 1 km at nadir, compared with 30 m). A pointable sensor such as the SPOT HRV can, in theory, provide much more frequent temporal coverage than the orbital pattern of the SPOT satellite and the swath width of the HRV would indicate.

7). This effect can be compared to the way in which the bony tissues of the human body are opaque to X-rays, whereas the soft muscle tissue and blood are transparent. Similarly, glass is opaque to ultraviolet radiation but is transparent at the visible wavelengths. 17 shows a plot of wavelength against the percentage of incoming radiation transmitted through the atmosphere; the window regions are those with a high transmittance. 7. The effect of the processes of scattering and absorption is to add a degree of haze to the image, that is, to reduce the contrast of the image, and to reduce the amount of radiation returning to the sensor from the Earth’s surface.

These particles and molecules range in size from microscopic (with radii approximately equal to the wavelength of the electromagnetic radiation) to raindrop size (100 µm and larger). The effect of scattering is to redirect the incident radiation, or to deflect it from its path. The atmospheric gases that primarily cause scattering include oxygen, nitrogen, and ozone. Their molecules have radii of less than 1 µm and affect electromagnetic radiation with wavelengths of 1 µm or less. Other types of particles reach the atmosphere both by natural causes (such as salt particles from oceanic evaporation or dust entrained by aeolian processes) or because of human activities (for instance, dust from soil erosion caused by poor land management practices, and smoke particles from industrial and domestic pollution).

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