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Scanning thermal plumesOver a three-year period 800 thermal line scans of power plant plumes were made by an airborne scanner, with ground truth measured concurrently at the plants. Computations using centered finite differences in the thermal scanning imagery show a lower bound in the horizontal temperature gradient in excess of 1.6 C/m. Gradients persist to 3 m below the surface. Vector plots of the velocity of thermal fronts are constructed by tracing the front motion in successive thermal images. A procedure is outlined for the two-point ground calibration of a thermal scanner from an equation describing the scanner signal and the voltage for two known temperatures. The modulation transfer function is then calculated by input of a thermal step function and application of digital time analysis techniques using Fast Fourier Transforms to the voltage output. Field calibration tests are discussed. Data accuracy is limited by the level of ground truth effort chosen.
Document ID
19750063548
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Scarpace, F. L.
Madding, R. P.
Green, T., III
(Wisconsin, University Madison, Wis., United States)
Date Acquired
August 8, 2013
Publication Date
October 1, 1975
Publication Information
Publication: Photogrammetric Engineering and Remote Sensing
Volume: 41
Subject Category
Environment Pollution
Accession Number
75A47620
Distribution Limits
Public
Copyright
Other

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