Good point. Might be a simple solution to the discrepancy.  

Yes another couple measurements is a great idea and will most likely clear up this discrepancy.  

This is not a Parcel Map that you are looking at. This is an Assessor parcel map used as a reference map showing possibly all the survey grade Parcel ...

Almost correct. Leave out 5:2. That is the surveyor's point 1:2 that I adjusted 0.28'. After translating your 5 points based on moving 500 to 100, you...

Isn't that the truth and thanks for the explanation. Your math skills are way beyond mine but I too find it fun to work out a math problem. It's proba...

Okay while I was writing you posted a map that I ignored earlier. That is an assessor map showing all the available survey maps in your Contra Costa C...

Like @williwaw said " you would need to do an actual survey to establish the true nature of their relationship by tying down both the county monuments...

Years ago 1980's we had to establish astronomic north (using a Polaris shot) for a BofB to layout 5 big radio towers. According to the site engineer, ...

1.) Enter the grid coords for points BR-4,5,6 into a traverse program and inverse between the points for the bearings and distances. 2.) Check the i...

@rfc I am however, really perplexed at how state of the art Leica RTK equipment can produce a point that's .28' off in fairly benign conditions. &nb...

Nice excel file and I could follow everything except those constants a1,b1,a2,b2. How did you get those? And no worries about your previous reply. I...

Yes I think the old surveyors point 1:2 is off by 0.28'. I am assuming that because the new point 5:2 will inverse to the surveyors old 4:1 and get th...

No RR expert here either but my software put the data you posted together and it looks good. The first station 445+18.4 appears to be NFG if we hold t...

So remember that 0.3' possible error in that 239 foot line? I calc'd a new #1:2 point 0.28' on the same NW bearing from #2:2 = #5:2. Then I inversed a...

Ya I did not know where this was nor the CSF so I just left the surveyor's GPS data alone. Also the 1689.16' distance is the same for GPS and TRAVERSE...

@mathteacher Can you make excel do a rotation?

Here is your data translated and rotated like you asked. There is a problem with using point #100 as a benchmark. It makes all your other traverse poi...

@summerprophet Very nice Excel file. I used your coords at TS and SC, did a right angle intersect from SC to the tangent line to get the spiral tan...

Just guessing here because I have almost no experience with spirals. My software, PCSurvey, will create a spiral using any 2 of 4 variables. Then I ca...

Looking at your map I see 3 longer distances that compare very well with each other but I do not know which is GPS or TS. The short 239 footer needs t...