Lecture_17_Remote_Sensing_ScanSat-newer

Lecture_17_Remote_Sensing_ScanSat-newer - Remote Sensing...

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Remote Sensing Scanning Systems as Input to GIS
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Basic Concept of Scanning 1. EMR is reflected from ground 2. Optics direct it to a beam splitter – prism or dichroic grate 3. Split beam goes to detectors (spectral) for each band 4. Analog to digital conversion (radiometric) 5. Recording
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Recorded information is used to build an image, line by line, into a matrix (raster) of reflected values for each band. Reflectance is measured according to the spatial, radiometric and spectral resolution of the system. Radiometric resolution
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Satellites use scanning technology
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LANDSAT First known as Earth Resources Technology Satellite (ERTS) Established US role in non-military remote sensing Resolution increased over time http://landsat.gsfc.nasa.gov/about/landsat1.html
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Landsat uses polar orbit to achieve revisit (temporal resolution). Rotational effects distort image as it is built up from N S.
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Orbit at altitude of 919 km (570 mi) takes 103 minutes Each orbit is displaced by 2875 km (1785 mi) at equator by rotation Exact revisit takes 18 days or 252 orbits (~20 times/yr)
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LandSat MSS IFOV = 79 x 79 m (resolution) Radiometric resolution originally was 6 bits with a post- processing increase to 7 bits. (0-63 0-127) Later sensors used 8 bits (0-255)
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Thematic Mapper Higher resolution sensor follow-on to MSS Spectral bands increased from 4 to 7 IFOV decreased from 79 to 30m Thermal band 120m Quantized to 8 bits (0-255) Data downlink increased 15 85 Mb/s
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Lecture_17_Remote_Sensing_ScanSat-newer - Remote Sensing...

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