Figure 2From: Spatially Heterogeneous Estimates of Fire Frequency in Ponderosa Pine Forests of Washington, USAStudy sites illustrating sampled fire-scars (black dots). In each map, the gray area represents an estimated fire perimeter for the year 1776. The perimeters were produced using inverse distance weighting to produce interpolated surfaces from the fire-scar point data. The resulting surfaces were used to generate the spatial mean fire interval (SMFI) for the four sites.Back to article page