[time-nuts] USGS Benchmark accuracy...?
camaraq1 at quantacorp.com
Wed Sep 14 16:52:39 UTC 2011
Hopefully it is better than the ones that denied Georgia a piece of
the Tennessee river - just about one mile off... Interesting topic in "How
the States got their shapes" on History channel.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Michael Baker
Sent: Wednesday, September 14, 2011 5:40 AM
To: time-nuts at febo.com
Subject: [time-nuts] USGS Benchmark accuracy...?
There is a USGS survey benchmark on the side of the road
just a half-mile from my house.
Any guess as to how accurate these are?
I parked my pickup truck over the benchmark with the LH
box and antenna ( a 10 year-old Trimble surveyors antenna).
I only let LH run for an hour-- I am not sure how I could
leave a LH box out there for a long survey period without
running the risk of theft. The survey marker is about 20 feet
off the side of the road in a grassy area and marked only by a
4-foot-tall plastic USGS geodetic pole next to the buried
The head of the marker post with the brass plate on the top
is flush with the surface, but covered with grass. I had to
scratch around to find it. There is also a second concrete post
in the ground about 30-40 feet away-- apparently you line up
the two concrete markers to give you a true cardinal direction.
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