Hi Tilt shots, with the LS

Nate The Surveyor

Well-Known Member
As the LS is configured at present, it will NOT take a shot, if it is some 5° or 10° off plumb.

HOWEVER, I can be carrying it tilted at nearly 90° off zenith, and it will show 3+ engines FIXED , and sometimes 5 or 6 when carrying it in a field.

I have had circumstances where I wanted to LEAN it over a big overgrown fence corner, and it would not shoot, because it was too far off plumb.
IMG_3914.JPG Here is a circumstance, where we also want to shoot a shot, with it very tilted.
We are standing on the bank. There is a pretty good sky view, out over the creek. NOT good sky view on the bank. We want to lean the LS out over the water, at some 60° off zenith, and ESTIMATE the centerline of the creek. The LS will perform BETTER with better sky view.
The alternative is wet feet, or excessive time, to get a good shot, on the bank.
So, what we want is control over the NUMBER in degrees, that it can take observations. I can see in some modes, (Like lift and tilt, hands free storing, and auto store, etc) not wanting it to take a shot at 60°, but we want user control over this number.
In the ACTION SETUP screen, at the bottom, (between ESC and OK) there is a bit of room, for a button, to set this angle.
I have a 12' rod, that I use. I have had a number of occasions to want this.

IF it is not too hard, to install this, we'd like it.

Thank You

Nate
 

Jim Campi

Active Member
Hi Nate,

It sounds like what you want is the LS NOT to correct for tilt and collect point data when more than X degrees out of plumb? I haven't had that need yet. What comes up more often is an obstruction over the point and a need to tilt, collect and correct (for example at a building corner).

I've noticed that the LS WILL collect at significant angles (say 30 degrees from vertical). Does anyone know if collecting this far out of plumb is accurate?
 

Matt Johnson

Well-Known Member
5PLS
I've noticed that the LS WILL collect at significant angles (say 30 degrees from vertical). Does anyone know if collecting this far out of plumb is accurate?

Currently, it is not accurate mostly due to the compass not being accurate when tilted. I have requested that the compass reading be investigated when the LS is tilted. I think this should be able to be improved.
 

Michael Stazhkov

Developer
JAVAD GNSS
I can add somewhere 2 settings: maximum allowed tilt angle when correct for tilts is on and when it is off. By default it will be 30° (when on) / 5°(when off).
Or it is enough one setting for maximum allowed tilt angle when correct for tilts is on?
 

Nate The Surveyor

Well-Known Member
And, if correct for tilt is on, or off and we exceed the tilt limits it is set to, then it should simply show TILT on the screen... so that we don't sit around trying to take a shot, when the LS will not do it.... it kind of makes you feel like a dummy, when you have been trying for 5 mins, and then discover TILT had you!
 

Michael Stazhkov

Developer
JAVAD GNSS
And, if correct for tilt is on, or off and we exceed the tilt limits it is set to, then it should simply show TILT on the screen... so that we don't sit around trying to take a shot, when the LS will not do it.... it kind of makes you feel like a dummy, when you have been trying for 5 mins, and then discover TILT had you!
As I remember Mikhail Drakin implemented several months ago some sort of warning: the inclination control should change its color. It should be in release version.
 

Michael Stazhkov

Developer
JAVAD GNSS
You can check the PreRelease version 2.0.0.237 where there are settings for maximum tilt angles (Action Setup -> Accept position accuracy screen)
QUICKSETUP-ACCURACY_20160518-20.24.50.png
 

Matt Johnson

Well-Known Member
5PLS
You can check the PreRelease version 2.0.0.237 where there are settings for maximum tilt angles (Action Setup -> Accept position accuracy screen)
View attachment 4608

I think the Maximum Corrected Tilt Angle should be limited to 5 or 10 degrees until the compass readings can be improved when tilted. Currently there can be a lot of error in the position if it is tilted more than this.
 

Shawn Billings

Shawn Billings
5PLS
I think the Maximum Corrected Tilt Angle should be limited to 5 or 10 degrees until the compass readings can be improved when tilted. Currently there can be a lot of error in the position if it is tilted more than this.

agreed. and the maximum uncorrected tilt may get pretty high. I don't know of any need to limit it as long as the receiver is tracking satellites.
 

Michael Stazhkov

Developer
JAVAD GNSS
agreed. and the maximum uncorrected tilt may get pretty high. I don't know of any need to limit it as long as the receiver is tracking satellites.
I think that in the case when there is no automatic correction for a tilt it is dangerous to pass epochs for averaging if the LS is tilted. It will create a big error in position. Espessially when lift & tilt is used.
This is why we selected the small maximum tilt angle (5°) in the case.
 

Michael Stazhkov

Developer
JAVAD GNSS
I think the Maximum Corrected Tilt Angle should be limited to 5 or 10 degrees until the compass readings can be improved when tilted. Currently there can be a lot of error in the position if it is tilted more than this.
Yes, now when we have the setting I can restrict it more.
 

Matt Johnson

Well-Known Member
5PLS
I think that in the case when there is no automatic correction for a tilt it is dangerous to pass epochs for averaging if the LS is tilted. It will create a big error in position. Espessially when lift & tilt is used.
This is why we selected the small maximum tilt angle (5°) in the case.

I think the desire by some users is to be able to lean it over some obstacle and locate the point under the LS (instead the point at the end of the pole).
 

Matt Johnson

Well-Known Member
5PLS
Currently, it is not accurate mostly due to the compass not being accurate when tilted. I have requested that the compass reading be investigated when the LS is tilted. I think this should be able to be improved.

We have figured out why I was seeing errors with the compass readings when tilted. The "Compass Tilt Compensation" option need to be enabled in the View Attributes screen. This setting has been removed and will always be enabled in the Prerelease version of J-Field.

VIEW-ATTRIBUTES_20160525-12.18.52.png
 
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