The water body shape file has been updated to include improved river shapes; The first photon bias correction has been implemented to calculate the apparent width of the full-width at half-max standard deviation of the ATL13 surface, the apparent strength, and the average detector time; Implemented an estimate of short segment wind speed from ATL09 input wind vector components at 10m; Derived standard deviation of water surface at the long segment rate; Implemented a minimum height for the range over which to perform the subsurface deconvolution and the bottom height of the vertical profile for long segments; The threshold procedure that tests photon counts within short-segment histogram multimode bins against sseg_mode_cnt_test, has been updated to use the standard deviation of signal photon heights per shot segment); The value of geoseg_edge_buffer is now selected based on the type and size of a given water body; Added a parameter in the water surface height computation that incorporates the maximum available geolocation segments from ATL03, as indicated by geoseg_edge_buffer, that lie outside both lake mask edge crossings; Changed the sign for electromagnetic bias (H_bias_EM); The expression for orthometric water surface height and depth from the mean water surface to the detected bottom have been updated to exclude H_bias_EM, when it is designated as invalid, and H_bias_fit is designated as valid; Implemented a new scheme that removes misidentified water surfaces due to near-shore influences. The number of short segments to be designated as anomalous, due to near-shore influences, is implemented as a 9x9 matrix that depends on water body type and size; Cloud confidence flag parameters are now retrieved from the ATL09 product and reported on ATL13 at the short segment rate; Implemented surface temperature and NOAA snow/ice flag at the short segment rate; Added six water body transect parameters.