I actually heard this one day this week, I kid you not.
Project manager was setting up a small job with two rebars and the top of a highway R/W marker for control. The two rebars must have been new property corners. The coordinates were 5000/5000 and oriented to deed north. Apparently the surveyor took his boundary survey and made a topo out of it. It's not ideal but it works if someone else doesn't come along and screw it up.
The project manager did a "here" shot on a random control point he had set for a base and calibrated to the three points, ... well, one point actually because someone had built a new fence and apparently knocked out the two rebars. So he shot the ground beside the new corner post and lo and behold, the elevations fit perfectly!!!!
I need to get a three legged stool to keep in my truck. I might even cut about 2 inches off of one leg. Maybe the visualization of the concept will soak in better.
James
that should work just fine;)
Isn't that the thing about a calibration, you can "fit" everything perfectly.
JaRo, post: 453586, member: 292 wrote: I actually heard this one day this week, I kid you not.
Project manager was setting up a small job with two rebars and the top of a highway R/W marker for control. The two rebars must have been new property corners. The coordinates were 5000/5000 and oriented to deed north. Apparently the surveyor took his boundary survey and made a topo out of it. It's not ideal but it works if someone else doesn't come along and screw it up.
The project manager did a "here" shot on a random control point he had set for a base and calibrated to the three points, ... well, one point actually because someone had built a new fence and apparently knocked out the two rebars. So he shot the ground beside the new corner post and lo and behold, the elevations fit perfectly!!!!
I need to get a three legged stool to keep in my truck. I might even cut about 2 inches off of one leg. Maybe the visualization of the concept will soak in better.
James
You didn't say what equipment he's using, but Trimble requires 5 points to get a vertical calibration.