Yesterday we were working on a small job about 12 miles from the office (as the crow flies). I had a Triumph2 broadcasting corrections over TCP from our office internet WiFi. At the site I observed four points by RTK for five minutes each with a Triumph-LS. I then setup a total station on one of those points and turned in the other three. All were within about 300 feet of each other. I then did a Helmert transformation of the total station coordinates to the RTK coordinates, allowing the software to determine the best rotation and translation to transform the total station system to the RTK system. I forced the scale to remain at 1. Points L001, L002, L003 and L004 were RTK derived. I was setup on T003 (L003) and turned T012, T002 and T004. The differences between the two sets of coordinates are as follows:
Point# Northing Easting Elevation
Delta-Y Delta-X Delta-Z
----------------------------------------------------------------------------
L001 872.791 405.084 419.534
T012 872.767 405.061 419.575
-0.024 -0.023 0.040
L002 904.213 702.294 410.933
T002 904.227 702.298 410.933
0.014 0.004 0.000
L003 899.143 482.485 415.170
T003 899.147 482.487 415.266
0.004 0.002 0.095
L004 170.840 530.628 424.130
T004 170.846 530.644 424.023
0.006 0.017 -0.106
I was very pleased and surprised to see this sort of accuracy from a single baseline solution at 12 miles. Five minutes is a fairly long observation time, but in the grand scheme of things four points at five minutes each is 20 minutes of observation time.
Point# Northing Easting Elevation
Delta-Y Delta-X Delta-Z
----------------------------------------------------------------------------
L001 872.791 405.084 419.534
T012 872.767 405.061 419.575
-0.024 -0.023 0.040
L002 904.213 702.294 410.933
T002 904.227 702.298 410.933
0.014 0.004 0.000
L003 899.143 482.485 415.170
T003 899.147 482.487 415.266
0.004 0.002 0.095
L004 170.840 530.628 424.130
T004 170.846 530.644 424.023
0.006 0.017 -0.106
I was very pleased and surprised to see this sort of accuracy from a single baseline solution at 12 miles. Five minutes is a fairly long observation time, but in the grand scheme of things four points at five minutes each is 20 minutes of observation time.