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15 November 1993 Effect of spatial resolution on cloud area retrievals: a comparison of results derived from the airborne visible/infrared imaging spectrometer (AVIRIS) and the thermal infrared multispectral scanner
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Abstract
Thermal Infrared Multispectral Scanner (TIMS) imagery and Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) imagery are registered to each other for seven scenes. Cloud area, as determined by applying the 3-band ratio method to AVIRIS imagery, is used to determine the optimum temperature threshold in the TIMS imagery. For this set of scenes, a threshold of 2 degree(s) to 3 degree(s) below the background temperature provides for the most accurate cloud pixel identification. Five to 8% differences in cloud area are found when comparing cloud pixel identification between AVIRIS and TIMS. Some of the differences are due to misregistration; however, at least half are due to differences in the mensuration process. It is demonstrated that cloud edges have a distribution of temperature thresholds, indicating the difficulty of locating cloud edges with a single temperature threshold. It is found that cloud edges occupy nearly half of the entire range of scene temperatures, significantly overlapping the distribution of background temperatures.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Rand E. Feind and Ronald M. Welch "Effect of spatial resolution on cloud area retrievals: a comparison of results derived from the airborne visible/infrared imaging spectrometer (AVIRIS) and the thermal infrared multispectral scanner", Proc. SPIE 1938, Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data, (15 November 1993); https://doi.org/10.1117/12.161547
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