On arriving on a 15 acre parcel for boundary survey, took note of what appeared to be clear lines of occupation, walked a sufficient distance down the road ROW and set a capped rod for control, just off the asphalt (it is a very low traffic road). Base up and collecting static, I started to run the boundary. As I made it back around, it became evident that occupation in this portion was not fitting the evidence.. and suddenly my base point just so happens to fall less than 1 foot from being an on-line offset to the actual corner in the roadway.
Now of course the feuding neighbors all think it's a corner and can't understand my pleas to ignore it and obviously I can't leave it there as it is certain to cause confusion for those following me down the road.
Lesson learned here.. should have made sure I was completely clear. That said, there's still a good bit of work left on this, and I'd like to go ahead and move it sooner than later: What's the best procedure to establish a new RTK basepoint on an existing project in progress?
I did set a second point as a check shot a couple hundred feet away, however it's in the actual roadway and not a place I could leave the base.
?ÿ
Set a new point, then get a couple of independent observations, either long(ish) RTK or short(ish) static, from the existing base point and compute a weighted average. Move base to the new point, then check into the original base point for a check.
Wouldn't hurt to check into a couple of other points too. If it's within tolerance for your project, you're likely good to go. Fix one or the other base points during post-processing, probably the newer one if you yanked the old one.
Rover83 pretty much nailed it.
I'm wondering what else you had in mind?
You don't really "move" an existing RTK base point.
Out of curiosity are you working in a standard projection or a local grid where the north central meridian was determined from where the base was set originally?
It makes a difference.?ÿ
After you've established the new one, since you say there is still a good bit of work left, why not run static on the "new" base location as well and pull in your nearest CORS data to incorporate in processing both the previous and the new base point??ÿ (Assuming you have CORS stations close enough to be useful)
What Rover 83 said works. Set a new base from the old. Check it. Proceed.
I make it a habit to have an alternate base available as a back up plan, just in case the primary one gets destroyed.?ÿ I'm always thinking of any work I do being the starting point basis for future work in the neighborhood, perhaps years later. Monument and document accordingly.?ÿ
Thanks all!
The general public does not understand about control or traverse nails, and I have often been admonished when we are traversing that I am nowhere near the boundary/corner,?ÿ so I am diligent to hide those control points before leaving.
I once worked as a helper, where we started a lot survey on a Friday, and when we returned on Monday there was a brand new privacy fence built along the very dogleg which followed the traverse nails.
Another surveyor I worked with was traversing through a subdivision and would set his traverse point with a rebar at the back of curb.?ÿ I pointed out that the pin was set where you might expect one at the extension of the lot line between the houses, but he did not seem to care.
