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. Author manuscript; available in PMC: 2021 Feb 15.
Published in final edited form as: Atmos Environ (1994). 2020 Jan 20;223:10.1016/j.atmosenv.2020.117300. doi: 10.1016/j.atmosenv.2020.117300

Figure 2 -.

Figure 2 -

Optical depth, tau, comparisons between the Image-Based Reflectance method and Smoke Stain Reflectance method for 12 calibration filters (left) and 50 field samples (right). Approximate smoke stain reflectance of 20% is indicated by the dashed line. SSR is not recommended to be used on filters with a reflectance of <20% (corresponding roughly to an optical depth τ of >0.8 (Taha et al. 2007).