Added a QA parameter that indicates the percent of reference photons within a certain distance from the reference DEM (at the geolocation segment rate); Fixed a logic error in the code that combines the POD and PPD degrade values. In conjunction with this fix, the definition of the podppd_flag parameter was changed to simply indicate if POD, PPD, or both report, in general, a degraded geolocation solution; Effectively removed from consideration by the signal classification processing any photons from telemetry bands that do not intersect the DEM height within a +/- 30 m buffer. Additionally, photons that are poorly geolocated (as indicated by the podppd_flag) are no longer classified as potential signal; Created two new parameters (near_sat_frac and full_sat_frac) that indicate nearly or fully saturated ATLAS shots.