Term
| electromagnetic radiatiation |
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Definition
| E=Electrical field, M=magnetic field, travels at the speed of light, perpendicular to each other. |
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Term
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Definition
| wavelengths range from 400 billionths of a meter to about 10 billionths of a meter, uv waves can burn sking however most are blocked by ozone in the earth’s upper atmophere, uv wavelengths are used extensively in astronomical observatories, some remote sensing observations of the earth are also concerned with the measurement of ozone. |
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Term
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Definition
Violet 0.4-0.446 mm,
blue 0.446-0.500mm,
green 0.500-0.578mm,
yellow 0.578-0.592,
orange 0.592-0.620,
red 0.620-0.7 |
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Term
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Definition
| wavelengths range from less than a centimeter to tens or even hundreds of meters, used to transmit radio and television signals, radio waves can also be used to create images, the reflected waves can be used to form an image of the ground in complete darkness or though clouds |
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Term
spectral profiles of various types of vegetation
(grass, coniferous, deciduous, etc), |
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Definition
-can identify and isolate sources of heat
-materials absorb and reflect ER at various wavelengths with varying intensity
- can detect and identify sources and types of pollution
-can identify surface types and materials
-can classify urban structures and land use types
-can detect natural land covers and surface types
-Spongy mesoph11- oxygen and carbon dioxide exchange takes place here
-IR radiation is strongly reflected off cell walls
-Changing reflection of dying leaf
-Reflection of different types of vegetation
-surface absorption and reflection of different materials in spectral profiles
-bands
-bandwidths
-gaps
-landsat case study
spectral resolution of different sensors
-landsat TM
-7 different bands
-7 wavelength intervals
-ground resolution 30 by 30 and 120 by 120m for band 6
Band 1 450-515 um blue, lower limit= just above atmospheric scattering, lower limit=peak transmittance of clear water, upper limit= blue chorophyll absorption ends |
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Term
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Definition
| makes water visible, makes water and water quality visible |
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Term
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Definition
520-600um green
Lower limit=blue chlorophyll absorption ends, upper limit=red chlorophyll absorption bengins
Maps intensity of chlorophyll reflectance in the green part of the electromagnetic spectrum
Vegetation visible as it appears to the human eye |
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Term
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Definition
630-690 um red
Important for vegetation discrimination, differences in reflectance intensity between different types of vegetation also show up in the visible part of the electromagnetic spectrum, cutoff at .690 um due to crossovers of spectral profiles |
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Term
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Definition
760-900um near infrared
Lower limit at .760 um due to crossovers of spectral profiles, biomass depth, intensity and density, intensity of respones in this band can help determine type of vegetation
Vegetation density visible |
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Term
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Definition
1.55-1.75 um mid-infrared
Sensitive to plant turgidity water storage, can detect drought-induced stress in early stages, differentiates between clouds, water, ice and snow, hydrologic research
Water content of vegetation visible |
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Term
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Definition
10.40-12.50 um thermal infrared
Long wave heat radiation, temperature differences in surfaces, urban heat islands, soil moisture, geothermal activity, volcanic activity
-makes heat visible in this panchromatic image
makes heat visible in this false- |
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Term
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Definition
2.08-2.35um mid-infrared
Rock formations, surface roughness/smoothness can be distinguished well
Makes rock formation visible, |
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Term
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Definition
-sensor detects reflect ER from surface objects and atmosphere
-land-based systems
-sea-based systems
-atmospheric systems
-landpbased systems
landsat
SPOT
IKONOS
IRS
-sea-based systems
SeaWiFS
-atmospheric systems
GOES |
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Term
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Definition
-sensor sends out active signal and receivers altered signal
-land-based systems
-sea-based system
-land-based systems
-SRTM
-RADARSAT
Sea-Based systems
-TOPEX
-JASON-1
-SEASAT |
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Term
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Definition
movement of light through a material, transmission is wavelength dependent, the proportional amount of incident radiation passing through a surface.
Reflection: the process of radiation bouncing off an object, the angle at which radiation hits an object will be the same angle at which it is reflected, smooth surfaces act as specular reflectors, rough surfaces act as diffuse reflectors |
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Term
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Definition
| the absorption and conversion of electromagnetic radiation to other forms of energy, occurs in the atmosphere and on the ground, tends to occur in absortion bands |
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Term
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Definition
| the unpredictable reflection of radiation by atmospheric particles, most scattering occurs high in the atmosphere and makes the sky seem blue, during sunset, or in the evening the sun is low on the horizon- the sun’s rays have to travel through a longer slice of the atmosphere, this almost totally scatters blue light, letting the longer wave red light through, hence red skies |
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