Erroneous blowing snow detection was fixed by using an updated ANC30 (NOAA snow/ice maps) file; Added new control parameters demtol1 and demtold2 and low-rate segment_id; Modified blow_snow to accommodate the new surface signal changes; Replaced DDA constant layer_sep with the new constant min_layer_sep; Changed values for phi_ocean, asl_cal_factor and snow_age; Changed the low rate blowing snow implementation to select the profiles used based on wind speed and proper relation to the time of low-rate data; Fixed the computation error in total column optical depth to take the cosine of tilt_angle in radians rather than degrees; Implemented surface returns based on density, a replacement algorithm for Cloud/Aerosol Determination and detected ground as a layer when computing density algorithm cloud layer confidence; Improved the algorithm that removes ground surface from cloud layers; Added 400 shots to the theoretical background equation; Removed unused constant grd_search_width and added new constant min_layer_sep; Remove references to GMTED in dem_h and dem_flag.