Improvements to the thermodynamic model in the RIT Digital Imaging and Remote Sensing Lab's synthetic image generation software model, DIRSIG, were made to account for three forms of heat transfer: conduction, convection, and radiation from an internal heat source. A validation was completed that collected truth data and evaluated the performance of the modifications. The simulated contrast of the final temperature images was relatively close to truth contrast. In addition, the exposed area term from the thermodynamic model was modified with the DIRSIG shape factor calculation for four different scenarios to improve background object temperature interactions. The best scenario was a replacement of the exposed area with the shape factor in the sky/background temperature equation. Finally, interpolation on weather data to decrease discrete shadow edges was performed and evaluated. This approach significandy reduced edge effects, but due to incorrect scene geometry, previous simulated imagery and previous truth imagery did not coincide, making final conclusions difficult to predict.
Library of Congress Subject Headings
Infrared imaging--Computer simulation; Infrared technology--Simulation methods; Remote sensing--Data processing; Heat--Transmission--Data processing
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
Sirianni, Joseph, "Heat transfer in DIRSIG an infrared synthetic scene generation model" (1994). Thesis. Rochester Institute of Technology. Accessed from
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