USGS
USGS Western Ecological Research Center
Fuel Mapping and Fire Model
Current research has centered on the development of a new, high-resolution fuels map for Yosemite National Park. The map is based on satellite images of vegetative cover broken down into 30 by 30 meter squares, each representing one of 30 unique fuel categories. Additional data are provided by geographic information system (GIS) maps, aerial photographs and field measurements from more than 1,000 sites. All of this information is coupled with a computer model for predicting exactly where and how fast a given fire may spread.

The final product is a highly versatile tool for understanding fire behavior. Because of its relatively fine scale the map captures the mosaic-like nature of surface fuels over fairly small areas. Studies have demonstrated that fire spread is highly sensitive to this kind of local variability in fuel type, but previous fuel maps derived from remote sensing data have been unable to capture this level of detail. Moreover, the depth of information contained in the map allows researchers to conduct both long-term and real-time predictive modeling.

The map and model have already been used on several occasions to predict the behavior of natural fires. From each such application, further refinements are made. In these initial tests, such as during Yosemite's Horizon Fire in 1994, the model provided managers with maps showing where fire perimeters would be at various future times, based on existing or changing weather conditions. The model has since been used to plan and execute prescribed burns in the park and to predict fire behavior on landscapes subjected to different techniques of understory fuel reduction, from mechanical thinning of trees to prescribed burning.

The mapping and data analysis techniques can in principle be extended to much larger areas, such as the entire Sierra Nevada. The fuels modeling package can also be used as a research tool. For example, scientists can approximate what the local landscape might look like without a history of fire suppression, by allowing past suppressed fires to "burn" and run their course on computers.


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Last update: 05 March 2003