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@jim-frame So Jim did you ever GPS the Yolo base line? NGS Appendix #8 for 1882 does not give that much information.
I would like to know all about the final distance, the reduction to sea level, etc. The only way you can get this information is through NGS; by a ” station report “. It seems that no one at NGS knows how to do this. In the old days Ed Mckay did this for me for the Michelson base line in Southern CA. The Yolo base line distance that Chuck Fronczek reports in a paper he wrote
is 17486.595 meters (Mech. Apparatus Distance) and a Geodimeter distance measurement of 17486.574 meters (year and type of geodimeter was not listed). Thats 21mm difference or 1/833000 (please note that C.F. rounded up to 1/833000). I was always taught to round down to the nearest 100 meters.
JOHN NOLTON
That’s one of those projects that just hadn’t made it to the top of the to-do list, I’m afraid. I did get as far as building a custom short tripod that will sit securely on top of the granite obelisk. (I already had another short tripod that will work on the other obelisk.)
One of these days…
@jim-frame Jim several questions.
1. What type of GPS equipment do you have.
2. If you can fine the other end of the base line, HOW long would you observe it with your Units?
JOHN NOLTON
1. I’d be using Trimble 4000SSi receivers and Trimble Zephyr Geodetic antennas.
2. The other end has already been found. I’d observe for at least 2 hours so I could get the data into OPUS Projects, but I’d also process in Trimble Business Center just to get a closer look at the data.
@jim-frame
How come I’m not seeing any of the photos?
OK, thanks. I lived for years in Rumsey, CA and still explore the region on travels. I also have students in that region with whom I connect. I would love to know more about the Yolo base line and how to find the markers.
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