DANIEL MCCARTHY
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inconsistent RTK elevations

Started this discussion. Last reply by Cory Barnhart Nov 11. 23 Replies

Does anybody have advise to a way to weed through inconsistent shots? Our field crew goes out on Monday, shoots elevations on control stations set 10 years ago, (that have been checked-out to have…Read more →

Subject Tags: Inconsistent, Data, Vertical, RTK

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Cory Barnhart replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"RTK solutions are typically only good to about 0.1' vertically, thats why you're seeing so much of a difference. A rapid static solution at least 16m long (for OPUS processing) or conventional methods are your best bet"
Nov 11
DANIEL MCCARTHY replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Thank you, I will look it over and try that out. I will post any progress."
Oct 17
Desmond Elliott replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"The Carlson program you refer to, is it Carlson SurvCE? If so, set one receiver to collect static data internally to a memory card as a Static Base. Set the Rover as for RTK but don't connect to the base with UHF..fudge the RTK connection....As…"
Oct 17
DANIEL MCCARTHY replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Thank you for the reply, we have a Carlson program and are currently trying to figure out how to use the static collection mode in it. I used the old system we have for static collection and it does seem more accurate than the RTK collection. The…"
Oct 17
DANIEL MCCARTHY replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Thank you for the reply, we have a Carlson program and are currently trying to figure out how to use the static collection mode in it. I used the old system we have for static collection and it does seem more accurate than the RTK collection. The…"
Oct 17
Michael Sanchez replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Did you create a Geod for the project? Which did you localize on? Or did you use the base point? RTK is usually centimeter accuracy (horizontal) vertical is usually considered 3 X horizontal error I would cook static for 30 min and send to OPUS "
Oct 16
DANIEL MCCARTHY's discussion was featured

inconsistent RTK elevations

Does anybody have advise to a way to weed through inconsistent shots? Our field crew goes out on Monday, shoots elevations on control stations set 10 years ago, (that have been checked-out to have good NAVD88 elevations. They take 50 shots on each station using RTK, come in with the info and one might be within a few hundredths, the other may be 0.10' high, the last one might be 0.26' high. A week later, go back to the same control stations, again, take 50 shots on each one and be a tenth on…See More
Oct 16
DANIEL MCCARTHY is on spot light
Oct 16
Desmond Elliott replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"...a passing point, if you are using VRS, check the distance to the virtual reference point each time you make these checks...if there is a variable here you cannot expect consistency...as has been said in other replies the length of the vectors…"
Oct 15
William Kenter replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Rotate the rod I mean"
Oct 15
Gary replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"I always used to say it tells them where to drops the bombs...but it's no longer funny given the current global environment we find ourselves in! Good night...nice chatting with you Luann!"
Oct 15
William Kenter replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Before going into anything deeper. When your guys are shooting points, don't have then just sit on the point and collect. Have them rotate as they average shots. This may help."
Oct 15
Luann Glenn replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"One quick response, Gary....then I'm off to go to sleep. Several years ago, I performed a retracement survey by myself...rugged and timbered, along township and range lines, sections 35 and 36. I used GPS one morning and had just set up the…"
Oct 15
J. Anthony Cavell replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Dear Mr. CcCarthy, The published misfit of the Geoid12B model is 1.71 cm StDev (1sigma) nationwide. (It may be worse locally.)1.71 cm = 0.06ft.You don't indicate if your RTK is local or an RTN. I would expect a good RTM to be more consistent…"
Oct 15
Clyde Eldredge replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"(Add  Set the pair of points with RTK, then setup on the pair and shoot in the various points with the Robot or conventional total station)"
Oct 15
Clyde Eldredge replied to DANIEL MCCARTHY's discussion inconsistent RTK elevations
"Those differences in elevations (0.10' +/-) are consistent with RTK.   If you want consistence, set a pair of points with the RTK, then observe all the critical points with a Robot, or conventional instrument.  These results will…"
Oct 15

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I am here because I am a.
Professional Land Surveyor
Surveyor Bio:
BEGAN IN THE SOUTHERN TIER OF NEW YORK, MOVED NORTH AND LOVE IT.
26 years
Company
PRAETORIUS AND CONRAD
Location for Member Map
NEW YORK
Licenses Certifications or Awards
PROFESSIONAL LAND SURVEYOR
I have experience with the following
cadastral, topographic, boundary surveys, construction staking, topographic surveys, Survey Office, Cartography
How many years have you been surveying?
26 years
Most comfortable with the following types of instrumentation
Total Stations, GPS, Surveying Software, Automatic Levels, Old school surveying

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