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Accurate mapping of wildfi res is critical to fi re management. Technological advances in remote sensing and Geographic Information Systems (GIS) over the last decade have been widely incorporated into wildfi re mapping and management, but neither have been assessed for accuracy nor compared to established manual methods. Since Landsat-based mapping of wildfi res will soon replace manual mapping methods, this type of comparison is critical to understanding the strengths of each method. Landsat ETM+ imagery was classifi ed to create fi re perimeter maps for 53 fi res in Nevada, USA. These maps were then assessed for agreement with published, manually mapped fi re perimeters. Published perimeters were found to correlate poorly to remotely sensed fi re perimeters, and signifi cantly overestimated area burned (p ≤ 0.05) by an average of 18 percent. Mapping disagreement was then correlated to a measure of topographic roughness at four spatial scales to determine whether increasing terrain complexity was a factor in increased disagreement. Mapping disagreement showed a signifi cant positive correlation (r = 0.57) to topographic roughness. For fi re research spanning multiple decades, these results indicate that it may be diffi cult to utilize fi re perimeter data sets comprising both satellite-derived and manually mapped perimeters because the two data sets are signifi cantly different.

Assessing Accuracy of Manually-mapped Wildfire Perimeters in Topographically Dissected Areas