Two basic approaches have evolved to utilize radiance measurements (i.e., thermal radiation or scattered solar radiation) from satellite-borne instruments in data assimilation systems. The radiances (raw or cloud-corrected) may be assimilated directly or alternatively they may be pre-processed to retrieve geophysical parameters that are then assimilated. The retrieval process is often ill-posed...

We have built a new instrument to measure the in-water spectral upwelling radiance distribution. This instrument measures the radiance distribution at six wavelengths and obtains a complete suite of measurements (6 spectral data images with associated dark images) in approximately 2 minutes (in clear water). This instrument is much smaller than previous instruments (0.3 m in diameter and 0.3 m ...

Oil palm (Elaeis guineensis) trees are an important contributor of recent economic development in Southeast Asia. The high product yield, and the consequent profitability, has led to a widespread expansion plantations greater region. However, oil palms susceptible diseases that can have detrimental effect. In this study we use hyper- multi-spectral remote sensing detect diseased Krabi province,...

Striping effects, i.e., artifacts that vary systematically with the image column or row, may arise in hyperspectral or multispectral imagery from a variety of sources. One potential source of striping is a physical effect inherent in the measurement, such as a variation in viewing geometry or illumination across the image. More common sources are instrumental artifacts, such as a variation in s...

[1] We investigate the spectral signature of ice clouds in the far-infrared (far-IR) spectral region from 100 to 667 cm 1 (15–100 mm). Individual particle scattering properties (extinction efficiency, absorption efficiency, and the asymmetry factor of the scattering phase function) are calculated for small particles using circular cylinders and for large crystals using hexagonal columns. The sc...

Abstract We developed a new source, having uniform spectral radiance, for large-aperture UV integrating sphere with pressed polytetrafluoroethylene coating. Since lamp panel systems have high uncertainty due to low signal-to-noise ratio at 250 nm, transfer the radiance scale from nm 350 we and calibrated filter radiometer based on solar blind phototube. The was obtained via model of source recu...

This paper describes the design, construction and testing of a ship-borne spectroradiometer based on an imaging spectrograph and cooled CCD array with a wavelength range of 350–800 nm and 4 nm spectral sampling. The instrument had a minimum spectral acquisition time of 0.1 s, but in practice data were collected over periods of 10 s to allow averaging of wave effects. It was mounted on a ship’s ...

This study investigates multispectral characteristics of an unmanned aerial vehicle (UAV) at different observation angles by experiment. The UAV and its engine are tested on the ground in the cruise state. Spectral radiation intensities at different observation angles are obtained in the infrared band of 0.9-15 μm by a spectral radiometer. Meanwhile, infrared images are captured separately by l...