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Proceedings Paper

Difference of multispectral infrared imagery to track dust events
Author(s): Hong Fan; Guilin Chen
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Paper Abstract

Geostationary satellites play a key role in observing the spatial and temporal variations in surface and atmospheric features, which are important for monitoring short-term weather. While limited in spatial resolution compared to low-earth orbiting satellites, geostationary platform provides a significant advantage. The primary advantage is the ability to characterize the radiance by obtaining numerous views of a specific earth location for any time of day. This allows the production of a composite image to monitor short-term weather better. It will be shown that only 14% of days were missed in retrials, compared to the likely miss rate of 60-70% of a polar orbiting satellite. Mie theory is applied to calculate scattering characteristics of dust particles, and analyze dust channel selection of meteorological satellite. It can be seen that the visible channel is the primary channel available for dust aerosol observation. Also, the shortwave channel has some sensitivity to aerosols. Therefore, optically thick dust can have significant effect on infrared radiation. The radiative temperature of dust in shortwave infrared and longwave infrared is different also because emissivity is the function of wavelength. We compare the emissivity of rock, soils, vegetation, water and ice in shortwave and longwave channel, referring to the paper of John W. Salisbury. It can be seen that the different emissivity of soils is the most obvious. We apply difference of two wave bands to distinguish dust storm. The practical difference image proves the point. Geostationary orbit satellite is main tool in distinguishing short time weather phenomena such as dust storm due to its observational frequency and range.

Paper Details

Date Published: 10 January 2005
PDF: 6 pages
Proc. SPIE 5640, Infrared Components and Their Applications, (10 January 2005); doi: 10.1117/12.575257
Show Author Affiliations
Hong Fan, Shanghai Institute of Technical Physics, CAS (China)
Graduate School of the Chinese Academy of Sciences (China)
Guilin Chen, Shanghai Institute of Technical Physics, CAS (China)

Published in SPIE Proceedings Vol. 5640:
Infrared Components and Their Applications
Haimei Gong; Yi Cai; Jean-Pierre Chatard, Editor(s)

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