Brian Dobbs


The goal of this research can be divided into two main areas. The first is to improve the existing manner in which DIRSIG samples and references the atmosphere. The second is to give DIRSIG the ability to incorporate atmospheric inhomogeneities, as well as the ability to accurately model them. DIRSIG has limitations in how it currently samples the atmosphere. From a geometric standpoint, it does not fully sample the energy which is scattered by the atmosphere towards the sensor (upwelled radiance). There are also other geometric issues which lead to inaccurate modeling results. One significant inaccuracy is the fact that DIRSIG can mis-calculate the atmospheric effects resulting from modeling objects with non-zero altitudes. The plan is to correct this by completely reworking the procedure and geometry used by DIRSIG to sample the atmosphere. This research will also study the effects of an inhomogeneous atmosphere and the methods involved in modeling its effects. DIRSIG currently utilizes a single atmospheric look up table (LUT) that it references when creating an image. This LUT contains the information DIRSIG will need to predict the various radiance and transmission values for a homogeneous sky. There is no ability for DIRSIG to make one part of the sky optically thick, and the other clear. This will be remedied by having DIRSIG create a series of LUTs with different atmospheric properties that it can reference. With this ability DIRSIG can reference an optically different atmosphere depending on its viewing geometry, allowing a horizontally varying atmosphere.

Library of Congress Subject Headings

Remote sensing--Atmospheric effects; Remote sensing--Data processing; Imaging systems--Digital techniques; Infrared imaging

Publication Date


Document Type


Department, Program, or Center

Chester F. Carlson Center for Imaging Science (COS)


Schott, John - Chair

Advisor/Committee Member

Salvaggio, Carl


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TA1637 .D62 2006


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