We present a principled approach to selecting a surface reflectance model and setting its parameters. The approach is based on fundamental physical principles, comparisons between different models, and practical insight into the characteristics of real surfaces. Four models of surface reflectance were evaluated by comparing them with physical measurements on five different sample surfaces. Conc...

Regulatory Guides are issued to describe and make available to the public such information as methods acceptable to the NRC staff for implementing specific parts of the Commission’s regulations, techniques used by the staff in evaluating specific problems or postulated accidents, and data needed by the NRC staff in its review of applications for permits and licenses. Regulatory Guides are not s...

Regulatory guides are issued to describe and make available to the public such information as methods acceptable to the NRC staff for implementing specific parts of the NRC’s regulations, techniques used by the staff in evaluating specific problems or postulated accidents, and data needed by the NRC staff in its review of applications for permits and licenses. Regulatory guides are not substitu...