Spectral Sciences Incorporated

About: Spectral Sciences Incorporated is a company organization based out in Burlington, Massachusetts, United States. It is known for research contribution in the topics: Hyperspectral imaging & Radiance. The organization has 114 authors who have published 342 publications receiving 10875 citations.

Limb-viewing hyperspectral image simulation based on a polygonal earth cross-section (PEX) model

Abstract: This paper will discuss recent improvements made to the Monte Carlo Scene (MCScene) code to enable limb-viewing scenarios and situations where the sun is below the horizon. MCScene is a high fidelity model for full optical spectrum (UV through LWIR) hyperspectral image (HSI) simulation. MCScene provides an accurate, robust, and efficient means to generate HSI scenes for algorithm validation. MCScene utilizes a Direct Simulation Monte Carlo (DSMC) approach for modeling 3D atmospheric radiative transfer (RT) including full treatment of molecular absorption and Rayleigh scattering, aerosol absorption and scattering, and multiple scattering and adjacency effects, as well as scattering from spatially inhomogeneous surfaces, including surface bidirectional reflectance distribution function (BRDF) effects. The model includes treatment of land and ocean surfaces, 3D terrain, 3D surface objects, and effects of finite clouds with surface shadowing. This paper will provide a brief overview of how RT elements are incorporated into the Monte Carlo engine and the recent additional of a polygonal earth cross-section (PEX) model.

Spatial And Spectral Calibration Methods For Monolithic Vis/NIR and Vis/SWIR Hyperspectral Sensors

Abstract: A set of measurements and fitting procedures is described, that will be used to characterize a new hyperspectral sensor covering the visible-to-extended SWIR spectral range. The procedures produce maps of spatially-resolved spectral resolution across the focal plane, and spectrally-resolved spatial resolution in both the along-slit and cross-slit directions. They also yield spectral calibration, and characterization of the keystone, smile, and slit rotation. Examples are shown for an existing visible/near IR sensor.

The Last Movement, Part 3: Collapse, Climactic Resolution, a Stunning Reversal, and Celebration

Abstract: Chapter 11 examines the symphony’s denouement. Dramatically, the chorus sings Mahler’s music for Klopstock’s Auferstehen, the statement of traditional Christian eschatology Mahler heard at von Bülow’s funeral. The music begins with a complete returning-note figure, providing sublime satisfaction for listeners who realize that the many incomplete renditions of this figure insinuated the need for its completion here. The succeeding music confirms this powerful resolution. Christian resurrection renders life meaningful after death. The symphony could end here but for an important loose end: we still don’t know the significance of the sensual English horn theme. Stunningly, Mahler upends the choral climax and provides another, more compelling conclusion. The contralto sings the sensual music to Mahler’s verses, which offer a secular-leaning eschatology: immortality is gained not through judgment, but by striving for love. The symphony ends with a love duet in the manner of Tristan, and a powerful statement of the Immortality motive from Siegfried.

Full Spectrum Cloudy Scene Simulation for Remote Sensing Algorithm Development

Abstract: Development of algorithms for remote sensing applications can be facilitated with accurate scene simulations, where terrain reflectance and topography as well as all atmospheric and illumination conditions are controlled by the investigator. One such scene simulation model is MCScene. The MCScene model is based on a Direct Simulation Monte Carlo approach for modeling 3D atmospheric radiative transport, as well as spatially inhomogeneous surfaces including surface BRDF effects. The model includes treatment of land and ocean surfaces, 3D terrain, 3D surface objects, and effects of finite clouds with surface shadowing. Simulations can be performed from the UV through the LWIR. In this paper, we illustrate the use of MCScene as a tool in remote sensing algorithm development by simulating a partly cloudy scene and using this scene to test and evaluate a spectral cloud masking algorithm.

How to Complete the Symphony

Abstract: We know that Mahler put the Second Symphony aside for five years but resumed work in 1893, completing the three inner movements. In Chapter 8, we learn that he still lacked a text for what he planned as a choral finale. In March 1894, he attended the funeral of Hans van Bülow. There he heard a chorale on Friedrich Klopstock’s poem Auferstehen about resurrection. It provided a moment of epiphany regarding the needed text for the finale. According to his friend Josef Foerster, Mahler began composing the finale the same day and completed it in relatively short order. The Viennese psychoanalyst Theodor Reik, however, offered an alternative view of Mahler’s epiphany. Citing the annihilating criticism von Bülow levelled at the first movement of Mahler’s symphony, Reik suggested that Mahler unconsciously wished for the conductor’s death, and it was the fulfilment of that wish that expedited work on the finale.