So I recently, was on a new job and installed a magnail in a curb as control. Using the R10 unit we have I used RTN to set the point. I had good V and H accuracy at the time thought it was a good set. So just for kicks I did a rapid static (20min) on the point and uploaded to OPUS for solution. However when the solution came back it was off by 10' V and about 6' H . I was curious why this would be, as we had existing contours on the adjacent site which matched the RTN point.
Thanks?ÿ?ÿ
Uh oh!!!
What did the OPUS statistics look like (peak-to-peak errors, observations used, ambiguities fixed)?
New to the OPUS stuff so this is what I have
OBS USED: 3078/4644 : 66%
Quality IND. 24.27/30.46
Normalized RMS: 0.408
?ÿ
Does any of this help? More info needed?
Those numbers look pretty low for OPUS.?ÿ ?ÿDid you send the same static file to RTX for it's solution?
Can you send me the T02 file?
No I have not uploaded to RTX. I did however have a colleague suggest using a state plane convert, which in fact did put the?ÿ point dead on my RTN point, so I'm guessing I may have had some human error, however that being said my elevation is still not matching my RTN shot. Just to clarify the ORTHO HGT: is height including my ARP height correct. So all I have to do is take my ORTHO HGT and convert it from meters to ft??ÿ
Is the Z 6 feet high for OPUS? that sounds like OPUS is giving you the antenna elevation not the control point elevation which would be an HI issue. The 10' Horizontal may be international feet vs US survey feet. I would look at the lat, longs, heck I never look at coordinates with the?ÿOPUS solution, I only look at the lat., long. height info.
So this is my full opus report. My issue is understanding it. Very new to this and still can's seem to figure out the dependency in height . For reference my RTN/RTK shot on this control are coming in around 350.48 (ft) pretty consistent. However my static came back with 106.602 (m) which if I'm calculating is 349.65 (ft). Which is what is boggling me.?ÿ
?ÿ
SOFTWARE: rsgps?ÿ 1.38 RS56.prl 1.99.3?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ START: 2018/04/13 14:49:15
?ÿEPHEMERIS: igr19965.eph [rapid]?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ STOP: 2018/04/13 15:25:15
?ÿ NAV FILE: brdc1030.18n?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ OBS USED:?ÿ 3078 /?ÿ 4644?ÿ?ÿ : ?ÿ66%
?ÿ ANT NAME: TRMR10?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ NONE?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ QUALITY IND.?ÿ 24.27/ 30.46
ARP HEIGHT: 3.73?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ NORMALIZED RMS:?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 0.408
?ÿ?ÿ?ÿREF FRAME: NAD_83(2011)(EPOCH:2010.0000)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ IGS08 (EPOCH:2018.28118)
?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ X:?ÿ?ÿ?ÿ?ÿ?ÿ 1323834.887(m)?ÿ?ÿ 0.011(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 1323833.972(m)?ÿ?ÿ 0.011(m)
?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ Y:?ÿ?ÿ?ÿ?ÿ -4361056.172(m)?ÿ?ÿ 0.020(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ -4361054.781(m)?ÿ?ÿ 0.020(m)
?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ Z:?ÿ?ÿ?ÿ?ÿ?ÿ 4447132.685(m)?ÿ?ÿ 0.016(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 4447132.689(m)?ÿ?ÿ 0.016(m)
?ÿ
?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ LAT:?ÿ?ÿ 44 29 23.21034?ÿ?ÿ?ÿ?ÿ?ÿ 0.010(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 44 29 23.24670?ÿ?ÿ?ÿ?ÿ?ÿ 0.010(m)
?ÿ?ÿ?ÿ?ÿ E LON:?ÿ 286 53?ÿ 9.97242?ÿ?ÿ?ÿ?ÿ?ÿ 0.007(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 286 53?ÿ 9.95111?ÿ?ÿ?ÿ?ÿ?ÿ 0.007(m)
?ÿ?ÿ?ÿ?ÿ W LON:?ÿ?ÿ 73?ÿ 6 50.02758?ÿ?ÿ?ÿ?ÿ?ÿ 0.007(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 73?ÿ 6 50.04889?ÿ?ÿ?ÿ?ÿ?ÿ 0.007(m)
?ÿ?ÿ?ÿ EL HGT:?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 77.811(m)?ÿ?ÿ 0.025(m)?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ ?ÿ?ÿ76.675(m)?ÿ?ÿ 0.025(m)
?ÿORTHO HGT:?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ?ÿ 106.602(m)?ÿ?ÿ 0.028(m) [NAVD88 (Computed using GEOID12B)]
Did you really have an HI of 3.73 meters? Doubtful. That is surely the problem.?ÿ
Sorry I worte 350 +/- I meant to write 358 +/-. My bad. Yes I'm sure 3.73 meters double checked field book. Was set up over a curb two legs not extended at all the third just enough to level.
Did you really have an HI of 3.73 meters? Doubtful. That is surely the problem.?ÿ
What...you don't have a 12.24' fixed height rod?
3.73 meters would be 12.24 feet........I think you meant that your HI was 3.73 feet.
Edit:?ÿ I believe OPUS requires your HI to be in meters.?ÿ 3.73 feet would be about 1.14 meters.
Using an HI of 3.73 meters instead of 1.14 meters would result in a difference of 2.59 meters which is 8.5 feet.
Ahhhh. I now see the error of my ways. I will re-upload with the correct antenna?ÿ height.
?ÿ
thank you
very confusing, a 12.24' HI would not be a set-up to send off to OPUS. I think like the others mentioned you had a 3.73' HI. Still it's odd that you match within .7', 106.602m=349.74'.
I would still want to compare the NAD83 from OPUS to the NAD83 for the RTN point. That is the # which should match in the 3rd decimal point which is about .1'
Was your 3.73 meter antenna height measured to ARP or Phase Center? OPUS uses ARP. I think?ÿthe difference?ÿis?ÿaround 0.45' for an R10.?ÿ 12.24' is a pretty high antenna. Maybe you measured incorrectly?
The feet vs meters difference?ÿaccounts for 8.50ft in vertical.
Wow, this is becoming too much?ÿof a common problem among?ÿ"surveyors" and or GIS. In the past month, I have discovered gross errors such as this on four different projects, two different states, all different surveyors. Errors were 2.4', 2.8', 3.8', and 5.4ft. Some were due to International Feet vs. US Survey feet. Some we just could not figure out what they did wrong.
So resubmitted and everything came back spot on. Glad I joined really helped me flush out the problem. thanks again
So I recently, was on a new job and installed a magnail in a curb as control. Using the R10 unit we have I used RTN to set the point. I had good V and H accuracy at the time thought it was a good set. So just for kicks I did a rapid static (20min) on the point and uploaded to OPUS for solution. However when the solution came back it was off by 10' V and about 6' H . I was curious why this would be, as we had existing contours on the adjacent site which matched the RTN point.
Thanks?ÿ?ÿ
Are you saying the first solution was wrong due to a problem?ÿwith OPUS-RS? Then you resubmitted?ÿwith the corrected antenna height and the horizontal is now correct??ÿ Really!!
I don't think the horizontal position would change 6ft due to antenna height error!!!
So why the horizontal error, what fixed it?
