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RS and GIS: UWGB 2011

RS and GIS: UWGB 2011. Dutch, Fermanich and Stiefvater. http://www.cas.sc.edu/geog/rslab/Rscc/rscc-frames.html. Remote Sensing. What is Remote Sensing?. Acquisition of physical data of an object without touch or contact. Observation of a target by a device separate from it by some distance.

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RS and GIS: UWGB 2011

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  1. RS and GIS: UWGB 2011 Dutch, Fermanich and Stiefvater

  2. http://www.cas.sc.edu/geog/rslab/Rscc/rscc-frames.html Remote Sensing

  3. What is Remote Sensing? • Acquisition of physical data of an object without touch or contact. • Observation of a target by a device separate from it by some distance. • ”Reconnaissance at a distance.” • Depends on context. • Some definitions include Geophysical (seismic, magnetic, gravitational, acoustical, & nuclear decay radiation surveys) • These days usually implies more than mere visual processing

  4. What Sensors Detect • Electromagnetic radiation • Radio • Infrared (thermal) • Visible • Ultraviolet • X-Ray and gamma ray • Force fields • Gravity • Magnetism • Acoustic energy • Audible • Ultrasonic • Infrasonic • Seismic

  5. Sensors • Cameras • Radiometers and scanners • Lasers • Radio frequency receivers • Radar systems • Sonar • Thermal devices • Seismographs • Magnetometers • Gravimeters • Scintillometers

  6. Fig. 18-2, p.430

  7. http://www.cas.sc.edu/geog/rslab/Rscc/rscc-frames.html Remote Sensing

  8. Source of the radiation being sensed may or may not be independent of the sensing device. • Passive remote sensing relies on the radiation originating from some other source, principally the sun. • Often Visible, NIR

  9. Source of the radiation being sensed may or may not be independent of the sensing device. • Active remote sensing devices, such as radar, direct radiation of a particular form towards an object and then detect the amount of that energy which is radiated by the object. • microwave and radio wave regions of the EM spectrum. • Lidar (Laser Imaging raDAR) systems :ultraviolet, visible and near infrared wavelengths.)

  10. Physical Object Sensor Data Extracted Info

  11. Geographic Information Systems (GIS) • Data • Vector • Raster • Metadata (Data About the Data) • When, how, by whom acquired • What the data means • How accurate is the Data • How the Computer should deal with Data

  12. Image of the day • Where: Southern Chile • When: January 19, 2009

  13. Image of the day • Where: Southern Chile • When: January 19, 2009 • What’s being sensed? • Ash plume and previous ash falls • Dispersal patterns and paths • Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) • Multi spectral including visible and IR • Satellite: NASA’s Terra (launched Feb. 2000)

  14. Why Chaiten is Neat

  15. Image of the Day • Rehearse • Scale, location, orientation • Be able to pronounce terms correctly • Anticipate questions • Effects on people and environment • Unusual features in image • How data acquired

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