Strategy for determining the basis of Bearings of a control network; Part II

rfc · 2016-05-23T00:31:00Z

In this thread, started some time ago:made comments such as: After a "dry run" between two NGS marks nearby to prove I could do it, (that resulted in sub 10" accuracy), I've recently completed some more work on developing a basis of bearings for my control network. I did 4 full sets (8 D, 8 R) of Solar between two points on my network, and then did Arcturus (8 D, 8 R) for the same two points. Some uncertainty might have been added by using a distant "intermediate" backsight point, per Robert Hill's suggestion in the same thread noted above. The azimuth delta (all using Larry Scott's Excel Masterpiece in Process), between the two, was 1.7" of arc in azimuth. That's with a "5-second" gun. Beginners luck? Maybe, but stay tuned. Much more to come. Now all I need is to borrow someone's old L1 GPS rover and base for a month or so to prove that astro can be as accurate (for azimuth), as GPS.:stakeout:

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larry-scott

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((Your current az observation is easily good enough. But there will differences, probably small. And a constant is best case scenario. So, your probable 6-8" error to true SPC az won't change things, even if you can reduce that to 1-2" error.))

Posted : June 3, 2016 3:12 pm

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Strategy for determining the basis of Bearings of a control network; Part II

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