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RS and GIS: UWGB 2011

Dutch, Fermanich and Stiefvater

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Remote Sensing

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

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What is Remote Sensing?

Acquisition of physical data of an object withouttouch 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, & nucleardecay radiation surveys)

These days usually implies more than mere

visual processing

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What Sensors Detect

Electromagnetic radiation Radio

Infrared (thermal)

Visible

Ultraviolet

X-Ray and gamma ray

Force fields Gravity

Magnetism

Acoustic energyAudible

Ultrasonic

Infrasonic

Seismic

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Sensors

Cameras

Radiometers and scanners

Lasers

Radio frequency receivers

Radar systems Sonar

Thermal devices

Seismographs

Magnetometers Gravimeters

Scintillometers

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Fig. 18-2, p.430

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Remote Sensing

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

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Source of the radiation

being sensed may or may

not be independent of thesensing device.

Passive remote sensing

relies on the radiationoriginating from some

other source, principally

the sun.

Often Visible, NIR

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Source of the radiation beingsensed may or may not beindependent of the sensing

device. Active remote sensing devices,

such as radar, direct radiation ofa particular form towards an

object and then detect theamount of that energy which isradiated by the object. microwave and radio wave regions

of the EM spectrum. Lidar (Laser Imaging raDAR)

systems :ultraviolet, visible and nearinfrared wavelengths.)

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Applications

Land Use Geology Hydrology Vegetation Soils

GIS

Extracted Info

Sensor Data

Physical Object

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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

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Image of the day

Where:Southern

Chile

When:January

19, 2009

Chaiten Volcano, Chile

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Image of the day

Where: Southern Chile When: January 19, 2009

Whats 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: NASAs Terra (launched Feb. 2000)

http://asterweb.jpl.nasa.gov/http://asterweb.jpl.nasa.gov/

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Why Chaiten is Neat

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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