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The recording of information about objects by the use of a device not in physical contact with the object. The word remote is derived from the Latin...
“Hyperspectral” refers to the many wavelength bands that are characteristic of a remote sensing spectral data set. With earlier remote sensing...
Photogrammetry and remote sensing (in 'Topographic surveying and mapping' article)
These techniques involve the art, science, and technology of using photography to obtain reliable measurements. The first aerial photography took plac


= Encyclopedia Article; = Research Update
Figure 1.Hyperspectral concept. Images taken simultaneously (for example, in 200 or more spectral bands) are inherently registered. Each pixel has an associated, continuous spectrum that can be used to identify the surface materials. (After G. Vane, High spectral resolution remote sensing of the Earth, Sensors, no. 2, pp. 11–20, 1985)
Figure 2.Spectral reflectance curves of common materials.
Figure 1.Energy content of radiation emitted from (a) Earth and Sun and (b) atmospheric transmission due to absorption for the electromagnetic spectrum for wavelengths from 0.3 µm to 106µm (meter scale). The Sun's energy peaks at 0.48 µm with significantly higher energy content than the energy emitted from Earth. Passive microwave imagery relies on energy emitted from the Earth.
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