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Utility of Remotely Sensed Imagery for Assessing the Impact of Salvage Logging after Forest Fires
Rocky Mountain Research Station, US Department of Agriculture, Forest Service, Moscow, ID 83843, USA
Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, ID 83844, USA
* Author to whom correspondence should be addressed.
Received: 1 February 2012; in revised form: 4 July 2012 / Accepted: 5 July 2012 / Published: 13 July 2012
Abstract: Remotely sensed imagery provides a useful tool for land managers to assess the extent and severity of post-wildfire salvage logging disturbance. This investigation uses high resolution QuickBird and National Agricultural Imagery Program (NAIP) imagery to map soil exposure after ground-based salvage operations. Three wildfires with varying post-fire salvage activities and variable ground truth data were used to evaluate the utility of remotely sensed imagery for disturbance classification. The Red Eagle Fire in northwestern Montana had intensive ground truthing with GPS-equipment logging equipment to map their travel paths, the Tripod Fire in north central Washington had ground truthed disturbance transects, and the School Fire in southeastern Washington had no salvage-specific ground truthing but pre-and post-salvage images were available. Spectral mixture analysis (SMA) and principle component analysis (PCA) were used to evaluate the imagery. Our results showed that soil exposure (disturbance) was measureable when pre-and post-salvage QuickBird images were compared at one site. At two of the sites, only post-salvage imagery was available, and the soil exposure correlated well to salvage logging equipment disturbance at one site. When ground disturbance transects were compared to NAIP imagery two years after the salvage operation, it was difficult to identify disturbance due to vegetation regrowth. These results indicate that soil exposure (ground disturbance) by salvage operation can be detected with remotely sensed imagery especially if the images are taken less than two years after the salvage operation.
Keywords: QuickBird; NAIP; School Fire; Red Eagle Fire; Tripod Fire; spectral mixture analysis
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Lewis, S.A.; Robichaud, P.R.; Hudak, A.T.; Austin, B.; Liebermann, R.J. Utility of Remotely Sensed Imagery for Assessing the Impact of Salvage Logging after Forest Fires. Remote Sens. 2012, 4, 2112-2132.
Lewis SA, Robichaud PR, Hudak AT, Austin B, Liebermann RJ. Utility of Remotely Sensed Imagery for Assessing the Impact of Salvage Logging after Forest Fires. Remote Sensing. 2012; 4(7):2112-2132.
Lewis, Sarah A.; Robichaud, Peter R.; Hudak, Andrew T.; Austin, Brian; Liebermann, Robert J. 2012. "Utility of Remotely Sensed Imagery for Assessing the Impact of Salvage Logging after Forest Fires." Remote Sens. 4, no. 7: 2112-2132.