Prompted by this thread I took another look at NOAA Tech Memorandum NOS NGS 8 and found that it had undergone significant revisions with the latest version dated 2019.
I was unable to find mention of the 100-foot monument.
I also noted that it includes many photos and details about monument setting (both pillar and post).
Note as well there are now FCBL and CCBL.?ÿ
Well worth a read.?ÿ
On the matter of GNSS CBLs, you might want to take a look at this:
In the US there was some interest in the late 1990s toward establishing a GPS calibration network. To my knowledge they were never pursued.
When I went on a tour of the Trimble factory in Sweden years ago (former Geodimeter factory) they had a window that they opened and shot to a distant prism on a building, and they said that they tested every S6 that way before they shipped.?ÿ
It was the same when I was in Heerbrugg...the targets are in the vineyard across the street
?ÿ
@geeoddmike I miss my dear friend and fellow Marine Brother Charlie Glover. ?ÿI was bzo ing his M-1 and other toys not to long before he left us. ?ÿGreat guy and smart . He didn??t need a calculator to perform half of what I need one for. ?ÿ
yes many folks shooting a distance between two points is not enough to accurately check the edm ?ÿyou need distances at different lenths so the varying edm waves and such can be checked between multiple different types of edm??s ?ÿ The one wild we did accurately measured within specs at the shortest and longest lines but inaccurately measured to the middle marks . It has been so long ago now I believe it was measuring long on the middle marks out of specs ?ÿ?ÿ
?ÿ
@olemanriver?ÿ Are you talking about Charlie Glover of NGS? If so Mr. Glover was never a U.S.Marine. Where did you come up with this information?
JOHN NOLTON, USMC 1961 to 1970
?ÿ
Got the dc file uploaded from the field and processed the data...he mixed prisms (which I didn't want him to do but didn't specifically tell him not to). Most of the shots were to a Wild GPH1P (-34), a few were to a Trimble Monitoring prism (-40).
When I ran it with both prisms, I got a scale error of -1.29 ppm, and a constant error of +0.0015 m.?ÿ
When I ran it with only the Wild prisms, I got a scale error of -0.65 ppm, and a constant error of +0.0003 m, which is within the specs of the instrument (1 ppm ?ñ 1 ppm). When he gets back to the office I am going to compare the two prisms on the baseline between my pedestals (~135 meters) to see if the offset of the Trimble prism is correct (assuming the -34 is correct based on the above).?ÿ
One thing that is critical when going to a CBL is getting the temperature right (the instrument has an onboard pressure sensor, which I have verified is accurate). An error of 1?øC corresponds to 1 ppm.
the -34 is correct
-34 or -34.4 ?
@john-nolton uhmm yes me and him talked about our time in the USMC. He told me he was in the USMC. ?ÿBrought me his rifle i sighted it in at Corbin. I served in USMC. If he was not then he told a whopper. But i had no reason not to believe him. ?ÿSo that came directly from him. ?ÿI see you were in as well. ?ÿ
@bill93 The -34.4 is probably correct, but my software only goes to the mm. I may be able to modify it and see if it makes any difference.?ÿ
But I think there are other limitations in the process that makes sub-mm somewhat unattainable.?ÿ
I wonder if there was a misunderstanding.?ÿ This profile has him drafted into the U.S. Army.?ÿ?ÿ
https://amerisurv.com/2017/03/24/in-memoriam-the-most-excellent-life-of-charles-charlie-glover/
@john-nolton well I reckon you were correct. He was drafted in the Aint Ready Marine Yet. ARMY. I bet he is smiling for pulling that one over on me it very well makes since why he had me site in his rifles lol. ?ÿBut if you would have not said anything i would have never ever doubted it. But American surveyor magazine had an article about him and stated his time with ngs then army then ngs or usc&gs. When I get to the pearly gates I will have to get him back for that one. ?ÿ
@john-nolton what was your MOS. Your service dates coincide with my step dads time he was at headquarters Marine Corps during the end of Vietnam.?ÿ
