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- W52048863 abstract "In October 2003 the Santa Susanna Mountains, located to the northwest of Los Angeles, CA, sustained severe wild fires. The Airborne Visible and Infrared Imaging Spectrometer (AVIRIS) acquired four meter spatial resolution data over the burning area to assess the impact of the fires on the wildland to urban interface. Additional goals of the flights were testing the capabilities of airborne hyperspectral sensors as tools for fire monitoring, fire model validation, and the validation of space borne systems fire fuel products such as the Moderate Resolution Imaging Spectrometer (MODIS). The acquired imagery shows strong variations of smoke, including full a large plume of smoke from the burning areas to a height of 15 kilometers. As expected, the variability in smoke concentrations corresponded to a strong variability in aerosol concentrations. Thus, a pixel wise method of smoke detection, respectively for aerosol analysis, was required to address the significant variability in the data. This paper evaluates the potential of the oxygen absorption band at 760 nm for the detection of smoke density in this rugged terrain. An analytical solution for the atmospheric path radiance term as observed by the AVIRIS system is first derived and presented. Alternatively, an iterative approach is given, where the spatial appearance of transmittance is optimized against the aerosol contents. The results are validated against the surface reflectance, terrain shape, and the short wavelength smoke distribution patterns that show reasonable spatial match but non reasonable absolute path radiance values. A sensitivity analysis of the method is currently in process using a synthetic scene of the area under study. We show a promising potential of using the oxygen feature for aerosol mapping. Furthermore, the advantage and the problems of using spectrally highly resolved instruments (such as APEX) for aerosol retrieval in narrow absorption features on a pixel by pixel basis are outlined." @default.
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- W52048863 date "2005-01-01" @default.
- W52048863 modified "2023-09-26" @default.
- W52048863 title "WILDFIRE SMOKE ANALYSIS USING THE 760 NM OXYGEN ABSORPTION FEATURE" @default.
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