Carl Strydom
  • Bellville
  • South Africa
Mention this on Facebook
Pass This On
  • Blog Posts
  • Hub Discussions (5)
  • Surveyor Support Group Forums
  • Land Surveyor Photos
  • Photo Albums
  • Land Surveyor Videos

Carl Strydom's Discussions

GPS Wobbly Breaklines - has anybody encountered this?

Started this discussion. Last reply by WADE DEDOBBELEER on Monday. 15 Replies

Hi.The easiest would be to post a few images on the problem. If it has happened to anyone before they would recognize the pattern immediately and possibly explain to me why this happens.Problem in a…Read more →

Boosts Received

Gift

Carl Strydom has not received any Boosts yet

Say Thanks!

 

Carl Strydom's Profile

Community Feed

WADE DEDOBBELEER replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"Well  it looks to me like user error, or equipment error. I'd discuss it with the party chief who acquired the bad data.. Sorry I couldn't help more"
Monday
Carl Strydom replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"And remember, the bad shots' positions are always before the correct shot. It's almost like the GPS takes the correct position but then averages it's position with the previous recorded shot. I know on some systems there is a…"
Monday
Carl Strydom replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"No. The DTM you're looking at was created with the bad data. The Y and X of the bad data is at some places as far as 2 meters out of position but the Z, as you can see, doesn't have such big jumps. I haven't overlayed the bad DTM…"
Monday
WADE DEDOBBELEER replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"So that TIN or DTM was created with the known good data from the 2nd and 3rd surveys (previously shown in dark blue and purple line color) as well?"
Jan 17
Carl Strydom replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"It's very hard to say anything about the heights other than "It roughly in the ball park""
Jan 17
Kevin D. Allen replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"Well, it looks to me like to have a classic example of a "Random Error" phenomenon, more commonly referred to in polite terms as "AAAAWWW   WELL.... CRAP!!!!..." "
Jan 16
WADE DEDOBBELEER replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"Clearly your survey crew was just drunk the first time...pretty standard. Can you take a screen shot showing the points in an elevation viewpoint? it would be helpful to see if the elevations are bogus as well."
Jan 16
Carl Strydom is on spot light
Jan 9
Carl Strydom's discussion was featured

GPS Wobbly Breaklines - has anybody encountered this?

Hi.The easiest would be to post a few images on the problem. If it has happened to anyone before they would recognize the pattern immediately and possibly explain to me why this happens.Problem in a nutshell: Person surveys a gravel road with a rover. They start on one side with a cross-section, say left to right, and then move on about 10-15m for the next section, which will be from right to left, and so on. A normal section would start with a spotshot on the boundary fence, shoulder, edge of…See More
Jan 9
Scott Reinhart replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"First, I'd overlay the topo on some satellite imagery.  Maybe that's how things are out in the field.  If it looks bad, check the precision of all the topo data points.  Your office software should be able to give you a…"
Jan 9
Kevin D. Allen replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"Well, first is did you loose lock and record a point with a high RMS error. Second, how far out of plum are you holding the rod? A careless rodman can "wave" a GPS head a couple tenths either way on a 6 or 8 foot pole. Third, are you…"
Jan 8
Tim Reed replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"I don't see the elevations of the points, or have photos of the site, or have been to the site, but this topo looks totally legitimate to me.  I say that because I've shot, drafted, surfaced, etc. on hundreds of miles of borrow ditch…"
Jan 8
Gary replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"Could be multi-path (false fix), could be a setting allowing fixed/float storing rather than just fixed, could be a glitch in your software as well as many other things. I have seen a software that, in one version, if you set the stakeout settings…"
Jan 8
Nitesh Shrestha replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"I think you have not connected the right dots, eg road left edge to road left edge, right edge to right edge etc. also look for if you recorded RTK float solutions."
Jan 8
ROB ROSA replied to Carl Strydom's discussion GPS Wobbly Breaklines - has anybody encountered this?
"Not knowing what the site looks like, but having this happen to myself with GPS, I'd check to see what was overhead or near the shots. Check the residuals on each shot and see if they were within tolerance. It looks like it's the 10% rule…"
Jan 8
Carl Strydom posted a discussion

GPS Wobbly Breaklines - has anybody encountered this?

Hi.The easiest would be to post a few images on the problem. If it has happened to anyone before they would recognize the pattern immediately and possibly explain to me why this happens.Problem in a nutshell: Person surveys a gravel road with a rover. They start on one side with a cross-section, say left to right, and then move on about 10-15m for the next section, which will be from right to left, and so on. A normal section would start with a spotshot on the boundary fence, shoulder, edge of…See More
Jan 7

Profile Information

I am here because I am a.
Surveyor
Surveyor Bio:
Surveying In Western Cape
Company
Joubert & Brink Surveys
Location for Member Map
Cape Town
Licenses Certifications or Awards
SAGC
SAGI
I have experience with the following
cadastral, topographic, boundary surveys, construction staking, topographic surveys, control network surveys, ground movement monitoring, GIS, Survey Office
How many years have you been surveying?
15
Most comfortable with the following types of instrumentation
Total Stations, Surveying Software

Leave a Comment

Comments Support Your Fellow Land Surveyors!   Sign in or register.

Follow Land Surveyors United

  • No comments yet! Add Your 2 Cents...
 
 
 

Where Thousands of Professional Land Surveyors, Students of Surveying and Educators are United through Collaborative Knowledge and Purpose.

Tools,Apps and Quick Guides

DEDICATED TO THE MEMORY OF SKIP FARROW (1953-2015)


Help With Survey Equipment

Social Support For Equipment

Surveying Video Categories

Surveying Photo Categories

United States Hub Forums

International Surveyor Hub Forums

Resources for Company Owners

Land Surveyor Social Media

Surveyor Resources Collections

Getting Started & Newsletter

Surveyor Birthdays

Surveyor Birthdays Today

Surveyor Birthdays Tomorrow

© 2019   © Created by Land Surveyors United   Powered by

Badges  |  Contact LSU  |  Privacy Policy  |  Terms of Service