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      Difference between point cloud and GCP

      List of checks to explain height difference between point cloud and GCP, using trajectory post-processing in CloudStation

      There are several explanations to this issue. 

      •  in CloudStation / Generate SBET, check the Payload Configuration : the Preset used, the lever arm values, and the orientation. 

      • in CloudStation / Generate SBET : check the base station coordinates by editing the station used in the SINGLE BASES list. 
        Parameters to be checked are : the coordinates themselves (1), if they match the Reference Frame and Epoch (2), the Antenna height, and measurement method (ARP or APC ) (3).

      Base_editBase_edit2-1

      • iin CloudStation / Generate SBET, at the Export Parameters stage,  check that the geoid model in used is the right one (4) , or even if Ellipsoidal height should be selected.
      •  in CloudStation / Generate SBET, at the Export Parameters stage, check that the reference frame used and epoch used match the GCP reference frame/epoch (5) (if point cloud would be compared to GCP) 

      Export_param-1

      • Think that a height difference can also be the consequence of a planimetric shift.