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Snow and Ice Application Note アプリケーションノート

"Albedo, the ratio of incoming to reflected solar radiation, plays an important role in climate by regulating the amount of shortwave radiation reflected or absorbed and subsequently reradiated as longwave radiation by a surface.” (Burakowski et al., 2015). Albedo changes are related to light scattering which is caused by changes in particle (crystal size) packing density and foreign materials such as algae or dust on the snow; these things impact the melt rate and can be an indicator of snow/water equivalent, which is important for reservoir management.. .

製品:
ASD 製品
日付:
April 18 2018
言語:
English
詳細
Measuring Solar Spectral Energy Application Note アプリケーションノート

The value of Full-Range Spectroradiometers for measuring Solar Spectral Energy:. Many climate and surface energy balance studies involve monitoring the direct, diffuse and total components of solar spectral irradiance as they relate to the Earth’s atmosphere and surface (ASD Inc., n.d.).Outdoors, the primary source of spectral irradiance is the sun. The diffuse radiation from the sky is found primarily in the visible and UV portions of the spectrum (ASD Inc., 2012).“Because the solar radiation on the sun-surface-sensor path in the 0.4–2.5 μm visible and near-IR spectral regions is subject to absorption and scattering by atmospheric gases and aerosols, hyperspectral imaging data contains atmospheric effects. In order to use hyperspectral imaging data for quantitative remote sensing of land surfaces and ocean color, the atmospheric effects must be removed.” (Gao et al., 2009)“Atmospheric turbidity generally inhibits reliable measures of vegetation and sometimes renders atmosphere-induced variations on canopy spectra to exceed those due to vegetation development. These effects make the accurate and quantitative translation of [vegetation indices] more difficult and complicated.“ (Gao et al., 2000)“The illumination and appearance of the solar/skydome is critical for many applications in computer graphics, computer vision, and daylighting studies. Unfortunately, physically accurate measurements of this rapidly changing illumination source are difficult to achieve, but necessary for the development of accurate physically-based sky illumination models and comparison studies of existing simulation models.” (Kider et al., 2014)“Radiance is normally obtained in the field by nadir measurement of specific ground targets, with incoming solar irradiance spectra typically acquired from coincident measurement of reflected energy flux from reference panels with known spectral and angular scattering properties.” (Peddle et al., 2001)

製品:
ASD 製品
日付:
April 18 2018
言語:
English
詳細
NIR and Petrology Application Note アプリケーションノート

The value of Full-Range Spectrometers for Petrology:. "Spectra, like human fingerprints, can be used to search for materials with a similar spectrum and to investigate the composition of the material.""Diffusive spectral reflectance (DSR) has been successfully used as a geologic tool to identify mineral phases in rocks and sediments. The method is non-destructive, fast, and relatively inexpensive.""Scattering properties are wavelength-dependent and can vary significantly over the VIS-NIR spectral range. In particular, the phase function of a granular material is affected by both the absorptivity and the external and internal structure of the grains, from the millimeter scale down to the wavelength scale.""Reflectance spectroscopy can yield valuable information on metamorphic intensity in rocks containing white mica, particularly in low-grade sequences where conventional indicators of metamorphic grade are lacking. Futhermore, the information can be obtained with field-portable spectrometer."

製品:
ASD 製品
日付:
April 18 2018
言語:
English
詳細
Energy in the 21st Century アプリケーションノート

When will the Demand for Energy exceed the Conventional Supply?.

製品:
ASD 製品
日付:
April 17 2018
言語:
English
詳細
Earth Observing Satellites アプリケーションノート

A chart of earth observing satellites with technical specifications, including:. NameOperator/CountryLaunch/End DateSensor TypeSpectral ResolutionSpatial (m)Radiometric (bit)Swath (km)Revisit (days)

製品:
ASD 製品
日付:
April 17 2018
言語:
English
詳細

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