Removed canopy finding flag in ATL08 regions 7, 8, 9, 10, and 11; Incorporated the CAB delineation of a ground surface to remove noise bands from the ATL03 data product prior to DRAGANN; Aligned the weak beam to the strong beam from ATL09 based on along-track distance for CAB profile cloud filtering; Updated description for MSW flag; Incorporated a single surface search to improve ground finding; Updated parameters on the quality_ph flag to allow certain photons as input into ATL08; Added a terrain and canopy quality score; Added steps for identifying whether photons are from a single surface or multi-surface; Added ground finding correction based on a priori DEM bias; Added extension of nighttime canopy photons, above FINALGROUND surface; Added steps to reject photons in the presence of fog or low-lying clouds.