Confirmed proper marking of invalid parameters from ATL03 to ATL09, including ocean tide. If an invalid is found, the average for the segment is set to invalid; Meteorological data from ATL09 for the weak beam has been properly aligned with the strong beam by using distance instead of time; Removed geolocation segments with poor orbit or poor pointing quality from being used by using the podppd_flag from ATL03; Dynamically converted MSS values to the tide-free system; Dynamically adjusted sea ice coarse track height filters for the tide-free system; Read the free2mean parameters from ATL03 and averaged them to a sea ice segment rate in to ATL07; Fixed error in calculation of sea ice segment length to correctly measure length and remove negative results; Fixed error in the computation of first photon bias.