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

Rand E. Feind; Ronald M. Welch

doi:10.1117/12.161547

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

Rand E. Feind, Ronald M. Welch

Author Affiliations +

Proceedings Volume 1938, Recent Advances in Sensors, Radiometric Calibration, and Processing of Remotely Sensed Data; (1993) https://doi.org/10.1117/12.161547
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

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.

Citation Download Citation

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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KEYWORDS

Clouds

Spatial resolution

Temperature metrology

Thermography

Image registration

Infrared imaging

Infrared radiation

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