We started a "plat check" today, which means that we verify that a survey company has set concrete monuments (CMONs) with PRM stamped on the attached discs. We calculated some of the points by using the bearings and distances on the plat. We then broke out the RTK and searched for the CMONs. A number of found points along one ROW line hit within a few hundredths of the calculated positions, but across the street on the other ROW line, two points were off by +/- 2.50' N & S and +/- 0.10' E & W.
If the basis of bearings were calculated using deeds, wouldn't that basis need to be adjusted if some of the deeds were based on something other than true north? If the basis (Point of Commencement to Point of Beginning, I think) of bearings were based on the PLSS, couldn't that cause a discrepancy when mixed in with deeds? I'm winging it here just to start a discussion. I have to exam the plat in detail tomorrow.
Great question! I can't offer the experience you need, but will be watching this to learn all I can.
Plat review is loads of fun.............not. You are now the official nitpicker. Does the bearing shown on the plat agree with the bearing in the description (and watch out for it saying north and west when it's really north and east). Just because the label says Southwest Corner, doesn't make it the southwest corner, unless it is. Oh look, three very different lines all have the same bearing and distance, when they should not. What's the width of this alley? Anyone know? Why does the symbol indicating the setting of a stone 4"x 12" x 16" appear 18 times but the symbol for finding a capped one-half inch bar only appears once, at the center of the section? When did we start setting stones?
I'm a bit confused here.
1.) Are both sides of the ROW shown on the same plat? If so, then the basis of bearing should be the same for the entire thing.
2.) If this area is platted then the deeds will just say the lot and block?
I'm not sure how you're mixing plat, deed, and PLSS bearings together.
One of the first steps is figuring out what the basis of bearing is. Maybe there's a note, and maybe not. If not, then did they assume one line matched an adjoining plat?
Sometimes you may have to find enough monuments from approximate coordinates to measure and then rotate the plat and put that info into your RTK search.