Hello,
I was out running some RTK yesterday, tying in some information for a drainage easement.
I had my base sitting on a found monument and was running along just fine, and then I get a message pop up about the receiver detecting a change in the base location, and did I want to store the new base as point Base_1. I said yes, and kept collecting data. I only had about a dozen or so shots left.
I am looking at the raw data in TDS Foresight DXM, and the data looks just fine. The new Base_1 is stored, but all the shots are from the original base.
The Base_1 point is about 252 feet or so from the actual base.
What does that message mean? I have only had that happen once or twice, and the data always looks okay.
Thanks,
Jimmy
That means that somebody else had a base station that was "walking" on your base to rover signal. When you ok'd the fact that the base had "moved" you most likely dirtied up all your data, I'm sorry to say.
When that has happened to me, it "scoots" all the shots over to the new base location.
Maybe you picked up another base? I'm not real familiar with TDS, but I've read it's possible with SurvCE. I thought you were a Carlson guy?
edit: oops, paden beat me to the draw.
If you were running GNSS with just a rover, then the base may have been only a virtual base. All it did was change the reference base and offsets so that your coordinates would still be on the same grid. You could have repeated a few of your points to check if there was a difference.
I am running survey pro 5.2, and I have a total of 1.5 years experience, for what that's worth.
I ran GNSS today, and got several virtual reference stations. I do not remember that ever happening while running the base AND rover unit.
Redundancy and check shots are always a good idea.
I agree with Paden, I've had the same exact message and it was because I picked up someone else's base. Crappy thing is (at the time, maybe they've fixed this) the raw data did not store the coordinates of the new base. I was able to reverse calculate the location of the new base using the dx, dy, dz in the raw data, and it placed the new base on the edge of a nearby construction site.
And the worst part is, the other base must been broadcasting using assumed ("Here") coordinates, because it was off from true SPC by about 13'.