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42 Cards in this Set
- Front
- Back
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The Big 3 of GIScience |
-Remote Sensing -GIS/digital cartography -GPS |
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Remote Sensing |
The acquisition and analysis of image data from aircraft and satellite systems |
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Possible Applications |
Homeland Security Forestry Agriculture Geology Hydrology |
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SeaSat (1978) |
First radar satellite for ocean monitoring |
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Landsat |
First satellite designed for nongovernmental use, also used in intelligence gathering |
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SPOT |
Higher resolution than Landsat, Non-USA, very successful |
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Radarsat |
Canadian, first satellite for forestry and sea ice mapping |
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IKONOS |
Intelligence quality imagery |
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-Environment -Security Industries |
Remote Sensing is driven by: |
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Basic Steps of Remote Sensing |
-Sensor measures something and transmits info to ground -Info is turned digital for analysis -Info is extracted, used, and provided to users |
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Giga |
1 X 10^9 |
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Mega |
1 X 10^6 |
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Kilo |
1 X 10^3 |
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Centi |
1 X 10^-2 |
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Milli |
1 X 10^-3 |
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Micro |
1 X 10^-6 |
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Nano |
1 X 10^-9 |
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(F + 459.67) / 1.8 |
Fahrenheit to Kelvin |
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C + 273.0 |
Celsius to Kelvin |
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Passive sensor |
When the target is self illuminated by a source that is NOT the sensor |
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Examples of Passive Sensors |
-Cameras not using flash -Weather satellites |
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Active Sensors |
When the target is illuminated by energy EMITTED by the sensor |
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Examples of Active Sensors |
LIDAR Radar Sonar |
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Electromagnetic energy |
created by any object above absolute zero from vibration of molecules and atoms (either natural or man-made) -NOT sound |
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Dual fields |
Electrical Field Magnetic Field |
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Frequency or Wavelength |
how we classify sections of the EM spectrum |
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Same fundamental laws, Wavelength |
One big spectrum, so all frequencies obey the ________, but the way they interact with matter is highly dependent on the _____________. |
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Frequency Wavelength Velocity |
EM energy has 3 basic wavelike characteristics |
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3.0 X 10^8 |
C in Meters per Second |
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Wavelength in meters |
Lambda is _______ |
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Frequency in hertz |
V in the triad is _________ |
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C = Lambda X V |
Triad formula |
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Black body |
Absorbs all the energy that strikes it, no reflection, no transmition |
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Wien's Displacement Law |
Not all emitted wavelengths are equal, many are predicated on the temperature of the object |
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LambdaMax |
Wavelength of peak emission = 2898/temp Kelvin |
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Near Ultraviolet |
0.3 - 0.4 Micrometers |
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Blue |
0.4 - 0.5 Micrometers |
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Green |
0.5 - 0.6 Micrometers |
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Red |
0.6 - 0.7 Micrometers |
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Near Infrared |
0.7-2.5 Micrometers |
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Stefan-B Law |
Total emitted radiation in watts = (5.6697 X 10^-8) * (Absolute Temp ^ 4) |
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Visible light around green |
Peak of emission from the Sun |
