Admittedly, I don't know a ton about GNSS, but came across this photo in an ad for FieldGenius 9.3:
It looks like he's leaning the rover over what looks like a monument. But wouldn't the technology they're pitching "self level" the unit relative to the tip of the pole? This photo makes no sense to me at all. Wouldn't it make more sense to have taken a photo of a monument close to the base of a tree or right against a wall, with the antenna leaning away from the building (and the tip on the monument)?
What am I missing here?
I don't think you missed anything, but FieldGenius "sales" missed everything.
Maybe black boxes have some new magic included.
Sales hype. The unit can calculate the out of plumb and give a location with some error for the tip. However you cannot post process check it because any GPS vectors will tell you where the antenna was not the tip. Given the accepted precision of level vials, the needed calculation requires tilt and?ÿtilt azimuth which is much greater than any level vial error. You may assume that it would work under a tree or against a building, but then you include error due to fewer probable visible satellites.
You are missing nothing because you have assumed what the salesmen wanted you to assume.
Paul in PA
Also, the assumption is the tilt sensor and digital compass are both calibrated correctly.?ÿ This includes re-calibration?ÿevery time the GNSS receiver enters a new area, changing the magnetic field. Just simply entering into a vehicle will require a recalibration.
It looks to me like they photo is intended to convey the idea that you don't have to plumb the pole, the tilt sensor will compensate and record the position as if the antenna were plumb over the point.?ÿ I personally don't trust the tilt sensors to do this accurately and reliably, so I keep it turned off on my receiver.
It does work, it would be better to show it with some type of obstruction which is why it's usually used. Of course, it's simple to check if your tilt sensor is working: first principles.
They do need to be calibrated for local conditions, but are handy to get that property corner under the brace panel.
It does work, it would be better to show it with some type of obstruction which is why it's usually used. Of course, it's simple to check if your tilt sensor is working: first principles.
They do need to be calibrated for local conditions, but are handy to get that property corner under the brace panel.
I had no idea. How far out of plumb is their spec?
I was speaking for Topcon tilt sensors, that need calibration for magnetic fields. At a closer look, the Leica GS18 tilt compensation sensor?ÿuses only an IMU, not a compass. Article says the GS18 can correct the tilt from any position.
Leica GS18 Calibration-free tilt compensating GNSS
According to Leica Geosystems, the GS18 is a calibration-free tilt compensating GNSS solution immune to magnetic disturbances.
GNSS measurements can be taken from any position on site, saving users up to 20 percent of time in the field over conventional surveying practices, because they no longer need to hold the pole vertical to level the bubble.
The GS18 T uses precise inertial measuring units (IMUs) and not a compass, so that users can measure with a tilted pole close to buildings, underneath cars and close to metallic objects.
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Topcon TILT on Hiper HR.?ÿ
According to Topcon the HR has a 9-axis inertial?ÿmeasurement unit (IMU), along with a digital compass, the HR can accurately compensate for up to 15?§ of tilt on the rod.
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It does work, it would be better to show it with some type of obstruction which is why it's usually used. Of course, it's simple to check if your tilt sensor is working: first principles.
They do need to be calibrated for local conditions, but are handy to get that property corner under the brace panel.
I had no idea. How far out of plumb is their spec?
Off the top of my head I think it is 30degrees, we don't use it much anymore, like some?ÿhave said you need to calibrate it and it often is quicker to just take a couple of offsets, or plumb a point up. Still it does work, we would locate a point next to the shot we are taking tilted, then check it plumb, and check it tilted a different direction, they would all check. You need to be really careful with your HI
If the operator does not plumb the rod, how does he know if he is holding it steady.
Surely the setup needs to stay in the same position thruout the collection cycle for each point.
It reminds me of when the TS came out and people kept saying that they do not need to cut line to survey anymore.
If the operator does not plumb the rod, how does he know if he is holding it steady.
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If the operator plumbs the rod how do you know if he is holding it steady? Or plumb?
I have not yet had the pleasure but it seems to me that these compensating rods are a terrific idea. Although from what I hear they are a few generations from really working right.?ÿ
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