Multispectralcamera

Apr 16, 2019 — Adding any aperture increases diffraction at the aperture, thus spot size increases because the rays are no longer parallel, there is no perfect ...

Jul 1, 2016 — You can see how using a much longer focal length and having to move away from the subject slightly has dramatically changed the depth-of-field ...

Multispectralandhyperspectralremote sensing PDF

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Hyperspectral vs multispectralcamera

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Polarizing filters used in sunglasses contain molecules which make it is easy for the electrons to oscillate in the horizontal direction (long direction) thus ...

Each technology is able to sense (“see”) outside the range of normal human vision. The difference is the number of bands and the narrowness of the bands.

There is no doubt that hyperspectral imagery is the most advanced precision ag solution to transform our analysis and optimisation of production, risk management, use of resources and reducing disease.

Hyperspectralimaging

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Multispectralandhyperspectralimaging

Horváth, G., Varjú, D. (2004). Circulary Polarized Light in Nature. In: Polarized Light in Animal Vision. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09387-0_15

Imagine flying over a property and looking down at fields of different colours and appearance. You might decide you know what is planted in each paddock, with accuracy dependent on how low you are flying.

RGBvs multispectral vs hyperspectral

Consider this example about a US project to inspect orange groves, looking for citrus blight disease, which used a Headwall Photonics’ Hyperspec® VNIR hyperspectral solution with an OEM camera mounted on a UAV.

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Multispectralandhyperspectralremote sensing

Circularly polarized light is rare in nature. It occurs only at total reflection of underwater linearly polarized light from the water-air interface outside the Snell window, at the reflection of light from the exoskeleton of certain insects and crustaceans, as well as in the bioluminescent light emitted by firefly larvae. Dinoflagellates are also known to induce circular polarization of light passing through their bodies (cf. Shashar et al. 1995a). However, optical structures which could selectively absorb and/or reflect left- or right-handed circularly polarized light have not been discovered until now in animal dioptric apparatuses. Furthermore, the photoreceptors do not discriminate between left- and right-handed circularly polarized light. Animals perceive circularly polarized light as if it was unpolarized, while elliptically and partially linearly polarized light with the same degree and angle of polarization cannot be discriminated by them. Thus, it is questionable whether circular/elliptical polarization of light in nature could have any biological importance.

Imagine we could safely view the world through the eyes of different creatures, enabling us to view infrared radiation, ultraviolet light and reflected electromagnetic energy*. Well, we can, with the use of multispectral and hyperspectral sensors.

The more detailed the spectral information recorded by a sensor, the more information that can be extracted from the spectral signatures.

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With multispectral detection, you would certainly be able to see differences between various elements, such as a tree plantation versus another crop.

hyperspectralvs.multispectralremote sensing ppt

With hyperspectral capabilities, you will see individual trees and plants, and even the subtle differences in the EMR emitted by disease and soil moisture levels etc.

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Citrus blight destroys the vitality of trees and can spread throughout the grove. One of the early signs of this disease is a byproduct secreted on the surface of the leaves. Inspection for this used to require a person climbing a ladder to inspect the top of each tree. More often, growers might not know of a problem until trees started dying.  With hyperspectral imaging, this can be seen 300-400 meters above the crops covering a large area quickly (mounted on UAVs), allowing quick action to eliminate the spread and minimise the destruction.

Hyperspectral sensors have much more detailed signatures than multispectral sensors and thus provide the ability to detect more subtle differences in aquatic and terrestrial features.

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Hyperspectral imagery consists of many more bands (hundreds or thousands) that are much narrower (10-20nm), using an imaging spectrometer.