Report of Research, Field Investigation and Survey of Robert D ...

5.4 Field Procedures
All field measurements were made using a Sokkia ISX2700 Real Time Kinematic (RTK) GPS
system. For the first day of field operations the base unit was set in a clear area close to the area
being worked in and the system was ‘localized’ (or referenced) to Station 2 on Plan 51R-34310,
assuming that this would put us in a reliable UTM co-ordinate system, since we did not have a
point with known co-ordinates to reference to. On the second day we again localized to Station
2, so that all points were in a common co-ordinate system. Ties were also made to some remote
survey monuments in Lots 9 and 14, and for these points, the RTK system was localized to GPS
Stations 1203 and 1201, respectively.
Once the final GPS processing relative to the PPP value for Station 1200 had been completed,
the entire field co-ordinate file underwent a co-ordinate transformation to make the file 3-
dimensionally correct. It turns out that our final co-ordinate values do not compare favourably
with those by Plan 51R-34310 at all, so all co-ordinates needed to undergo a 3-dimensional shift
to be in an accurate and reliable system. As a check on our work I compared our measured value
for the Lambden control point at Jackson Point with our own. We agree vertically within 0.04m
with the Lambden value, but differ by several metres with his horizontal values. Since the
Lambden work was done in 2001, I suspect that it is in NAD83 (original). The PPP Observation
we observed on our return trip verifies our values. As a further check, and to understand the
impact of our work on the lots in Reg’d. Plan 779, we also measured to four points from the
O.L.S. Stewart Boundaries Act application on Lots 42, 43, 44 and 45. Again we agreed within
0.02m with the co-ordinate values shown on that plan.
All measurements to survey bars consisted of a first sequence of 10 ties which were averaged.
Following this tie, a loss of satellite lock was forced, after which the system was allowed to reacquire
satellite lock and an independent check measurement was obtained for verification of the
initial averaged value. In the event that the comparison is not satisfactory, the process is
repeated, until we are confident that the repetition tie and check tie are compatible, and that no
corruption of the GPS signal is taking place.
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