To see how NGS addresses a cluster of points away from the main route of leveling (spur lines) see screen captures from the Leveling Projects Tool.?ÿ
They do not do extra foresights (is that what you mean by sideshot?)
@field-dog Yes, that was what I meant at the time, but I've since been educated that was never done.
@rankin_file I know Curt quite well. I spearheaded the Lewis &?ÿ Clark monument setting for Curt at the Lewis & Clark Interpretive Center. I haven't seen Curt for quite awhile. He stays busy mining sapphires by Helena.
Do you know who replaced Curt's position?
@rankin_file Who took Curt's position after he retired. I know Curt quite well. He's keeping busy mining sapphires outside of Helena. It's been a few years since I've seen him.
@skeeter1996 Curt??s replacement was -I believe Pam something or other- my apologies for being forgetful. She was there about 2 years and retired in ??18- 19- now Brian Shaw is the advisor for this area. I??m not sure if Mark Armstrong was somewhat assigned when NGS was filling slots and reorganizing-I know he came out for the Opus-projects training for us, but it think that was a temp assignment.
Some bench marks are disturbed. Normally they can be identfied using GPS.?ÿ
Any NGS bench mark should be verified before using it for control.
Pam Fromhertz was the advisor there before Brian Shaw. Brian was a geodesist at NGS HQ in Silver Spring, MD prior to that. He worked on the field observations for the GSVS 17 survey in Colorado. Guess he liked it there.
I don't know what the closure tolerances were back then, but I bet they weren't 0.0 feet. I'm betting they were closer to a 1.0 foot.
The latter wouldn't be a good bet.?ÿ Geodetic leveling specifications for a given class haven't changed much in the last century.?ÿ For a First Order Class I line 300 km long, the maximum allowable closure error is about 7 cm (0.23').
@murphy?ÿ Yes, Especially finding an NGS benchmark with three "MARK NOT FOUND."