Rejection of first occupation at L16800W/2650N
  • The tree cover was found to be too thick for the RTK to get a fixed solution.
  • The gravimeter had to come back to the station and take measurements in a new,
    more open location, for which an RTK position has been collected.

Regarding the 3333 tie file:
  • A virtual check-in was created for the end of the day, because another
    gravity check-in point was used and 3333 wasn't revisited. To do this:
      – A Δ from datum value was calculated for the check-in used at the 
        end of the day:
          ○ station 2223
          ○ datum                          7378.533 mGal
          ○ end of day value             – 5522.618 mGal
          ○ Δ                            = 1855.915 mGal.
      – The Δ value was then subtracted from the datum of 3333 to create 
        a virtual check-in at the time of the 2223 check-in:
          ○ station 3333
          ○ datum                          7335.710 mGal
          ○ Δ                            – 1855.915 mGal        
          ○ virtual check-in             = 5479.795 mGal

Regarding the 2 xyz files:
  • The DEM covering the whole area is very large, in fact likely too large for
    the field computer used in conjunction with Gravred 3.2 (who is systematically
    loading the whole DEM to the RAM before proceeding to calculations). So in order
    to avoid errors due to lack of memory available, the inner DEM was split into
    2 files of 5.5M points each, and the results from two individual runs are added
    together to create the final xyz containing one unique inner DEM correction value.
  • The final xyz is actually a merger of all days together.