rs and gis: uwgb 2011

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RS and GIS: UWGB 2011 Dutch, Fermanich and Stiefvater

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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. - PowerPoint PPT Presentation

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Page 1: RS and GIS:  UWGB 2011

RS and GIS: UWGB 2011

Dutch, Fermanich and Stiefvater

Page 2: RS and GIS:  UWGB 2011

Remote Sensing

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

Page 3: RS and GIS:  UWGB 2011

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

Page 4: RS and GIS:  UWGB 2011

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

Page 5: RS and GIS:  UWGB 2011

Sensors

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

Page 6: RS and GIS:  UWGB 2011

Fig. 18-2, p.430

Page 7: RS and GIS:  UWGB 2011

Remote Sensing

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

Page 8: RS and GIS:  UWGB 2011

• 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

Page 9: RS and GIS:  UWGB 2011

• 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.)

Page 10: RS and GIS:  UWGB 2011

Applications

Land Use Geology Hydrology Vegetation Soils

GIS

Extracted Info

Sensor Data

Physical Object

Page 11: RS and GIS:  UWGB 2011

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

Page 12: RS and GIS:  UWGB 2011

Image of the day• Where:

Southern Chile

• When: January 19, 2009

       Chaiten Volcano, Chile

Page 13: RS and GIS:  UWGB 2011

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)

Page 14: RS and GIS:  UWGB 2011

Why Chaiten is Neat

Page 15: RS and GIS:  UWGB 2011

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