Postfire soil burn severity mapping with hyperspectral image unmixing
Robichaud, P.R.; Lewis, S.A.; Laes, D.Y.M.; Hudak, A.T.; Kokaly, R.F.; Zamudio, J.A. 2007.
Postfire soil burn severity mapping with hyperspectral image unmixing.
Remote Sensing of Environment (2007), doi:10.1016/j.rse.2006.11.027. 14 p.
Keywords: Hayman Fire; Ash; Mixture tuned matched filter; Hyperspectral; Burn severity
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Burn severity is mapped after wildfires to evaluate immediate and long-term fire effects on the landscape.
Remotely sensed hyperspectral imagery has the potential to provide important information about fine-scale ground cover
components that are indicative of burn severity after large wildland fires.
Airborne hyperspectral imagery and ground data were collected after the 2002 Hayman Fire in Colorado to assess the
application of high resolution imagery for burn severity mapping and to compare it to standard burn severity
Mixture Tuned Matched Filtering (MTMF), a partial spectral unmixing algorithm, was used to identify the spectral
abundance of ash, soil, and scorched and green vegetation in the burned area.
The overall performance of the MTMF for predicting the ground cover components was satisfactory
(r2 = 0.21 to 0.48) based on a comparison to fractional ash, soil, and vegetation cover
measured on ground validation plots.
The relationship between Landsat-derived differenced Normalized Burn Ratio (dNBR) values and the ground data
was also evaluated (r2 = 0.20 to 0.58) and found to be comparable to the MTMF.
However, the quantitative information provided by the fine-scale hyperspectral imagery makes it possible to more
accurately assess the effects of the fire on the soil surface by identifying discrete ground cover characteristics.
These surface effects, especially soil and ash cover and the lack of any remaining vegetative cover,
directly relate to potential postfire watershed response processes.
Moscow FSL publication no. 2007e