Figure 10-25. Two SIR-C/X-SAR L-band images of Yellowstone National Park, Wyoming obtained in 1994, six years following a major fire in 1988. At right is a map of the forest crown showing its biomass. The map is displayed on a color scale from blue (rivers and lakes with no biomass) to brown (non-forest areas with crown biomass of less than 4 tons/ha) to light brown (areas of canopy burn with biomass of between 4-12 tons/ha). Yellow indicates areas with a biomass of 20-35 tons/ha; and green is forest with a biomass of greater than 35 ton/ha). SAR measurements of fire-affected regions can clearly aid in monitoring forest regrowth after a fire.