Electromagnetic Spectrum

Electromagnetic spectrum
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Electromagnetic Spectrum
Visible
The electromagnetic (EM) spectrum is the complete range of wavelengths of electromagnetic radiation emitted from the sun, ranging from the extremely short Gamma rays to the longer radio waves.

[edit] Electromagnetic spectrum
Main article: Electromagnetic spectrum
Electromagnetic spectrum with light highlighted ...

Electromagnetic spectrum; Engineering Mapping Solutions (Firm)
ENC
Electronic Navigational Charts (NOAA) ...

Electromagnetic spectrum The range of wavelengths of energy some of which can be recorded by a remote sensing device. Equivalent A map projection that maintains the quality of equal area.
F ...

Electromagnetic Spectrum See spectrum. Electron A sub-particle of an atom that contains a negative atomic charge. Element A molecule composed of one type of atom.

An image is stored as a raster data set of binary or integer values that represent the intensity of reflected light, heat, or other range of values on the electromagnetic spectrum.

The spectral resolution of the sensor specifies what wavelengths of the electromagnetic spectrum are measured. The spatial resolution specifies the size of the area on the ground from which the measurements that comprise the image are derived.

EOS is being implemented to acquire global data by sensor systems operating at wavelengths across the electromagnetic spectrum.

ITRES optical imaging systems operate throughout the electromagnetic spectrum, which includes the visible-near infrared (VNIR), shortwave infrared (SWIR), midwave infrared (MWIR) and longwave thermal infrared (LWIR).

This radiation "signal" can be detected by a variety of sensors, depending on which part of the electromagnetic spectrum it occupies.

Only a narrow band of the electromagnetic spectrum (between ultra-violet and infra-red), contains visible light. White light consists of radiation at all wavelengths of the visible spectrum.

[remote sensing] One layer in a raster dataset that represents data values for a specific range in the electromagnetic spectrum (such as ultraviolet, blue, green, red, and infrared), or radar, ...

Here satellites use different sensor packages to passively measure the reflectance from parts of the electromagnetic spectrum or radio waves that were sent out from an active sensor such as radar.

Band One layer of a multispectral image representing data values for a specific range of the electromagnetic spectrum of reflected light or heat. Also, other user-specified values derived by manipulation of original image bands.

Using sensors sensitive to various bands of the electromagnetic spectrum.
Assessing its spectral image without having the sensor in direct contact with the surface.

Most remote sensing devices record data from several wave-lengths of the electromagnetic spectrum. These values can be interpreted to produce a "classified image" to give each pixel a value that represents conditions on the earth's surface (e.g.

oil depth across an open-water oil spill
soil pH
reflectance in a certain band in the electromagnetic spectrum
elevation
landform aspect (compass bearing of steepest downward descent)
salinity of a water body ...

the information obtained from a remote sensing instrument consists of reflectance measurements, often in several different bands or parts of the electromagnetic spectrum
measurements are in discrete units with fixed range, e.g. 0-255 ...

Satellite Imagery: Digital data obtained from sensors carried in satellites. It includes collecting data both in the visible and non-visible portions of the electromagnetic spectrum.

It can be spatial (what is the smallest size and object needs to be to be observed). It can be spectral (number and size of area of the electromagnetic spectrum is required). It can be temporal (how often does the subject need to be observed) (TWS).

Satellites with sensors sensitive to various bands of the electromagnetic spectrum provide a remote sensing platform for LANDSAT analysis of elements as, e.g., land use, geology and soils data.

the double-projection type characterized by its use of reduced- scale diapositives and stationary lamphouses with condensing lenses. multispectral scanner (MSS) Device for sensing radian energy in several channels of the electromagnetic spectrum.

See also: Object, Image, Surface, Information, Cover