shooting a corner with tilt
- Thread starter Michael
- Start date
First go to home screen 2 and tap calibrate. Calibrate the compass and levels. After that tap the compass button in the action screen then options. Check on correct for tilts. Make sure your rod height is correct.
John Thompson
Well-Known Member
Adam has nailed the basic procedure. As for how to hold the rod on the point to get the best precision, I've tried a few different methods, and I suggest that you do too so you can get a feel for what to expect. I have found that I get the best results if I calibrate compass and level offset as Adam described, then average multiple shots with the rod tilted in the same direction, but rotated 180 degrees (twist the pole) so that the compass and level errors should cancel. I have my LS mounted on the pole with a quick attach like this that can swivel, so if the shot is not in canopy and epochs are steadily being collected, I take one shot but every 30 seconds rotate the LS 90 degrees until it has faced all 4 directions for the same amount of time (120 seconds total). The pattern of flyspecks on the screen is usually split into 4 quadrants of approximately equal size. You may need to open up the Confidence Guard a little if the 4 clusters are too far apart. Also, RTPK does not compensate for tilts (yet), so expect the red asterisk (RTPK position) to be moved off of the green square (RTK average position) in the direction the rod is leaning. If your action profile is waiting for RTPK to agree with RTK, it might never get there.
Nate The Surveyor
Well-Known Member
I have a dumb and related question. I often lean the LS over a fence post, or some other object. I allow non corrected tilt shots over to 35 degrees.
Where is the specific point of measurement, on the LS? Is it on the top of the LS, bottom of the LS, or some distance above it? I've been intending to set a nail in the top of a post, take an observation plumb, then lean the LS over, and find out for myself where it's at. But, I haven't done it yet. What I mean, is if the bottom of the LS is sitting on a peg, and you lean it to 35 degrees, how much does the horizontal position change?
I often lean the LS out over a creek. Or a fence corner, or some other object.
Thank you,
Nate
Where is the specific point of measurement, on the LS? Is it on the top of the LS, bottom of the LS, or some distance above it? I've been intending to set a nail in the top of a post, take an observation plumb, then lean the LS over, and find out for myself where it's at. But, I haven't done it yet. What I mean, is if the bottom of the LS is sitting on a peg, and you lean it to 35 degrees, how much does the horizontal position change?
I often lean the LS out over a creek. Or a fence corner, or some other object.
Thank you,
Nate
Horizontal shift would be 115mm x Sin(tilt). And also we have to take into account azimuth to project that shift on north and east. Also we have to take into account local angle correction between magnetic and grid north.