Today we recovered a section corner described as a scribed 6 "x 6" concrete monument. The "vertical" scribe is from edge to edge. The "horizontal" scribe extends from the lower half of the "vertical" scribe and does not reach the edge. We also found what appears to be a dimple in the center of the monument. We shot both the intersection of the scribed lines and the dimple. The published coordinates on the Certified Corner Record agree more closely to the intersection of the scribed lines. Tomorrow we're going to thoroughly clean the top of the monument and investigate the scribes and dimple more carefully. We have to shoot the monument a second time anyway. Can we assume that the center of the monument was the initial position and someone discovered a calculation error and they made some scribes to mark the correct position?
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I just found another CCR, written in 1997, on LABINS. No mention of the monument being scribed. The CCR we had with us today was written in 2004.
Can I ask what you are going to clean the monument with?
The corner record says [ scribed "1/4 S" ]
I don't see any indication that lines are scribed on it to define the position, just to identify it.?ÿ Are you sure those lines are for position ?
The picture almost looks like a broken-off post with the top quite rough.
What do you find from measuring the ties? You have redundant ties, three of which are very close so easy to measure. They should rule over a GNSS answer.
As far as checking coordinates, the difference is probably not much relative to expected RTK accuracy, and are you sure you have taken into account the datum shift between NAD83(1990) HARN and the datum your RTK network is on??ÿ
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We haven't discussed what we're going to clean it with yet. Any suggestions?
We never checked the sides of the monument for "1/4 S." One of the scribed lines is pretty deep, like it was made with a saw. It's definitely a concrete monument. We didn't check the ties. We didn't take into account the datum shift. I would definitely like to learn how to do that. I'll let you know what datum our RTK network is on. Thank you very much for your thorough response.
I really don't have a suggestion but would refrain from any chemical application and probably would use water and a small brush. I once used bleach on a headstone which was a terrible mistake.
Around here a nail set in a tree is a no-no. Saws don't like them and after a few years they are basically unusable.
I never got back with my crew to the monument. I'm on the county's version of medical leave due to a lower back problem. I was confused with the meaning of scribed monument thinking it meant scribes to define the position of the monument. Thanks again for clearing that up.
