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Fire Ecology
Fig. 4 | Fire Ecology

Fig. 4

From: Modeling sub-boreal forest canopy bulk density in Minnesota, USA, using synthetic aperture radar and optical satellite sensor data

Fig. 4

Regression results between field estimates and satellite-derived estimates of total fuel density (TFD; kg m−3) and canopy bulk density (CBD; kg m−3) used for mapping fuel within the Superior National Forest, Minnesota, USA, following field data collection in 2015 and 2016. Models of TFD (coniferous fuels above ground level) and CBD (coniferous fuels 2 m above ground level) based on weighted canopy gap fraction are denoted T and C, respectively, while numbers 1, 12, and 123 refer to zenith angle ranges (0 to 7°, 0 to 23°, and 0 to 38°, respectively) of the LAI-2200C instrument. FuelCalc-based estimates of CBD are denoted FC. The dotted black line represents unity between field-measured and satellite-calibrated estimates of fuel density

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