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29 Cards in this Set
- Front
- Back
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Define 'Target' |
The practice of deriving info about the Earth's land & water surfaces |
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Three major differences between air photo and satellite imagery? |
Air photo is: 1) large scale 2) camera (film or digital) 3) low altitude |
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Advantages of satellite imagery (over air photos)? |
1) Remote access 2) Global availability 3) Easily integrated with GIS 4) Low cost per unit area 5) Synoptic view 6) Provides record at specific time 7) Monitoring changes |
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What is a wavelength? |
Distance between successive wave peaks. |
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What is frequency? |
Number of cycles per second (passing a fixed point). |
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Name the electromagnetic spectrum from large to small. |
Radio, microwave, ultraviolet, visible, near infrared, far infrared, visible, x-rays, gamma rays |
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What is the electromagnetic spectrum range for ultraviolet? |
0.1ym - 0.4ym |
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What is the electromagnetic spectrum range for blue? |
0.4ym - 0.5ym |
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What is the electromagnetic spectrum range for green? |
0.5ym - 0.6ym |
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What is the electromagnetic spectrum range for red? |
0.6ym - 0.7ym |
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What is the electromagnetic spectrum range for near infrared? |
0.7ym - 3.0ym |
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What is the electromagnetic spectrum range for far infrared? |
3.0ym - 14.0 ym |
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What is the electromagnetic spectrum range for microwave? |
0.3cm - 30cm |
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Define the Stefan-Boltzmann Law. |
Total power/temperature radiated from a black body. |
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What is the Stefan-Boltzmann constant? |
5.6697 x 10^-8 W m^-2 K^-4 |
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What is the Stefan-Boltzmann equation? |
M = oT^4 |
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What is the Wein's Displacement Law? |
Peak wavelength of radiant emitted by an object |
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What is the Wein's Displacement Law Equation? |
ymax = k/T |
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What is the constant (k) in Wein's Displacement Law? |
2898ym*k |
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What are the 3 effects of atmosphere on energy transmission, explain each type and give an example. |
Raleigh Scattering: Diameter of an object in the atmosphere is smaller than electromagnetic radiation wavelength. eg. gas molecule Mie Scattering: Particles in atmosphere same diameter as electromagnetic radiation wavelength. eg. dust, pollen, water vapour Non-selective Scattering: particles larger than y. eg. water dropelets |
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What is atmospheric absorption and absorption bands? |
When radiant energy is absorbed and converted to other forms of energy by water, CO2... etc. Absorption bands present when there is no EMR at a certain wavelengths available for remote sensing. |
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Name the 5 remote sensing sensors and their respective ranges? |
1) Human Eye: 0.4ym - 0.7ym 2) Photographic System: 0.3ym - 0.9ym 3) Multispectral Scanner: 0.3ym - 14ym 4) Thermal Scanner: 3 - 5ym or 8 - 14ym 5) Radar System: 3cm - 30cm |
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Difference between specular and diffuse radiation? |
Specular is a mirror-like reflection where energy is reflected in a single direction equal/opposite to the angle of incidence. Smooth surface. Diffuse occurs when energy is reflected randomly in all directions. Rough surface. |
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Which type of vegetation has the highest spectral reflectance curve? |
grass, deciduous, coniferous... |
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What does a wide range of a spectral reflectance curve graph mean? |
Less intense or a pure green b/c more wavelength included. |
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What does the water look like on the spectral reflectance curve? |
Little reflectance/dark due to water absorbing most energy. |
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What is the best way to use remote sensing to tell if vegetation is healthy? |
Look at the infrared section of a spectral reflectance curve graph - healthy vegetation will have a higher infrared peak |
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What is 8bit? |
The number of shades of grey (levels) that can be put into each cell (256 in this case). |
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What are the 7 Digital Image Processing System Functions? |
1) Image restoration and correction 2) Image display and enhancement 3) Statistical analysis 4) Classification 5) Accuracy Assessment 6) GIS operations 7) Import/export |
