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DTSTART:20170312T030000
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DTSTAMP:20170227T194916Z
UID:EF247BFD-FD01-11E6-A7C6-0050568D7F66
DTSTART;TZID=America/New_York:20170301T150000
DTEND;TZID=America/New_York:20170301T160000
DESCRIPTION:A critical first step in the analysis of hyperspectral or multi
 spectral imagery in the reflective domain (visible to SWIR) is atmospheric
  correction\, or compensation\, whereby atmospheric absorption and scatter
 ing effects are removed and the data are reduced to surface spectral refle
 ctance. Broken cloud fields pose a problem for many atmospheric compensati
 on and aerosol retrieval algorithms\, as these algorithms typically assume
  uniform illumination\, and ground illumination in the vicinity of clouds 
 is inhomogeneous due to photons scattering from clouds into clear sunlit a
 reas. In this work\, illumination effects are simulated for a variety of b
 roken cloud fields using the MCScene code\, a high-fidelity model for full
  optical spectrum (UV through LWIR) multispectral image simulation. MCScen
 e provides an accurate\, robust\, and efficient means to generate spectral
  scenes for algorithm validation. MCScene utilizes a Direct Simulation Mon
 te Carlo approach for modeling 3D atmospheric radiative transfer\, includi
 ng full treatment of molecular absorption and Rayleigh scattering\, aeroso
 l absorption and scattering\, and multiple scattering and adjacency effect
 s\, as well as scattering from spatially inhomogeneous surfaces. The model
  includes treatment of land and ocean surfaces\, 3D terrain\, 3D surface o
 bjects\, and effects of finite clouds with surface shadowing. We will disc
 uss the effects of broken cloud fields on solar illumination reaching the 
 ground\, and the consequence of solar scattered illumination from clouds o
 n retrieved surface reflectance and target detection.\n\nSpeaker(s): Rober
 t Sundberg\, \, Robert Sundberg\, \n\nRoom: 1125\, Bldg: CIS Building 76\,
  54 Lomb Memorial Drive\, Rochester\, New York\, United States\, 14623
LOCATION:Room: 1125\, Bldg: CIS Building 76\, 54 Lomb Memorial Drive\, Roch
 ester\, New York\, United States\, 14623
ORGANIZER:emmett@cis.rit.edu
SEQUENCE:4
SUMMARY:Sunnier than a Sunny Day: Recent Advances in Hyperspectral Image Si
 mulation for Partly Cloudy Scenes
URL;VALUE=URI:https://events.vtools.ieee.org/m/44146
X-ALT-DESC:Description: <br /><p>A critical first step in the analysis of h
 yperspectral or multispectral imagery in the reflective domain (visible to
  SWIR) is atmospheric correction\, or compensation\, whereby atmospheric a
 bsorption and scattering effects are removed and the data are reduced to s
 urface spectral reflectance. Broken cloud fields pose a problem for many a
 tmospheric compensation and aerosol retrieval algorithms\, as these algori
 thms typically assume uniform illumination\, and ground illumination in th
 e vicinity of clouds is inhomogeneous due to photons scattering from cloud
 s into clear sunlit areas. In this work\, illumination effects are simulat
 ed for a variety of broken cloud fields using the MCScene code\, a high-fi
 delity model for full optical spectrum (UV through LWIR) multispectral ima
 ge simulation. MCScene provides an accurate\, robust\, and efficient means
  to generate spectral scenes for algorithm validation. MCScene utilizes a 
 Direct Simulation Monte Carlo approach for modeling 3D atmospheric radiati
 ve transfer\, including full treatment of molecular absorption and Rayleig
 h scattering\, aerosol absorption and scattering\, and multiple scattering
  and adjacency effects\, as well as scattering from spatially inhomogeneou
 s surfaces. The model includes treatment of land and ocean surfaces\, 3D t
 errain\, 3D surface objects\, and effects of finite clouds with surface sh
 adowing. We will discuss the effects of broken cloud fields on solar illum
 ination reaching the ground\, and the consequence of solar scattered illum
 ination from clouds on retrieved surface reflectance and target detection.
 &nbsp\;</p>
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