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Strictly Surveying
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I did a check this morning just to give me confidence that a new pair of BRx7's were giving me reliable positions.
I have two capped rebars buried in my lawn 271 feet apart. I also drove two mag-hubs in my driveway about 10-feet apart. First I tied down the four points with my trusted, but old, Leica 1105 robot. Then I repeated the procedure using RTK with my GRx7's. The GRx7 was always giving me "Sure-Fixed" positions. I also direct taped between the mag-hubs.
The results were quite favorable. Inversed distance between the rebars was 271.82 (robot), 271.81 (BRx7). The horizontal position of coordinates varied .05-.07'.
The distances between the two mag-hubs?ÿ were 9.82 (direct tape), 9.82 (robot), 9.81 (BRx7). The horizontal positions varied .05-.09'.?ÿ
The site of the test is not ideal. I have 140' tall white pines and maples within fifty feet and buildings within thirty feet.
I found it interesting to do this little exercise.
Chris Rollins, Plainfield, NH
Posted : June 26, 2021 10:04 am
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BRx7, not GR. Ha.?ÿ?ÿ
Posted : June 26, 2021 10:05 am
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The next test will be under heavy canopy. The BRx7 fixes quite easily under canopy, but I want to compare Leica robot with BRx7 when the BRx7 cannot "sure-fix."
Posted : June 26, 2021 10:16 am
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@cerolli I look forward to the results!
Posted : June 26, 2021 1:12 pm
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@cerolli When you say the positions varied, do you mean that while the inversed distances between pairs of stations from the BRx7s were within 0.01 ft of those from the robot, the coordinates of any one station as reported by the BRx7s could be as much as 0.09 ft different from those from the robot? Thank you for sharing this test.
Posted : June 26, 2021 1:17 pm
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What did you use for horizontal control for the robot??ÿ?ÿ
Posted : June 26, 2021 2:09 pm