Lecture_14_Remote_Sensing_InputstoGISdb

Lecture_14_Remote_Sensing_InputstoGISdb - Remote Sensing...

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Remote Sensing Inputs to GIS
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What is remote sensing? Using technology to record information Using technology to record information about the environment… about the environment… Strictly speaking, remote sensing means that the instrument is not in contact with the environment it is sensing.
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Overview Electromagnetic Spectrum Photographic Sensing Photo-interpretation Satellite imagery Image analysis
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Temperature at the surface is ~5,800 – 6,000 K Total output from nuclear fusion is: 386 billion 386 billion billion billion megawatts per megawatts per second. second. The sun
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At top of atmosphere, sun approximates a black body (an ideal radiator) at 5800°K with peak in visible portion of the spectrum.
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Atmospheric Windows Substances in atmosphere selectively allow EME to pass or act to block it.
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Light interacts with object and is selectively absorbed or reflected
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Objects tend to have a characteristic way of reflecting EME. This is referred to as a spectral signature spectral signature .
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This note was uploaded on 04/01/2012 for the course 044 005 taught by Professor Davidbennett during the Fall '11 term at University of Iowa.

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Lecture_14_Remote_Sensing_InputstoGISdb - Remote Sensing...

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