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Doug Tarrant
  • Victoria
  • Australia
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Doug Tarrant's Associates

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  • Maurice Heter

Doug Tarrant's Discussions

Topcon Site calibration/localisation

Started this discussion. Last reply by Doug Tarrant Feb 16, 2017. 9 Replies

I am lead to believe Topcon GPS users may only calibrate for elevation on three, or is it four, control points to establish a localised level datum and that the result is an inclined plane of best…Read more →

Subject Tags: adjustment, setting, constant, plane, calibration

TSC3/S8 Stakeout an alignment

Started this discussion. Last reply by Maurice Heter May 9, 2016. 3 Replies

So it's midnight, there are twenty blokes watching you do your thing, ready to do their thing with their big expensive toys as soon as you're finished. The alignment you've keyed in looks OK, the…Read more →

Subject Tags: setout, Alignment, TSC3

Trimble TSC3/S8 Stakeout a line

Started this discussion. Last reply by Arnold Feb 10, 2016. 2 Replies

Hi All,If I am staking out a line which has elevations at each end, what can I expect to see on the screen in relation to difference in height to the line from my measured point. I'm happy with…Read more →

Subject Tags: line, a, Stakeout

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Joel van Cranenbroeck favorited Doug Tarrant's profile
Jan 29
Doug Tarrant replied to DAVID C. GARCELON's discussion THE LONGEST SIGHT.
"Just before I was married, so about 1980; using a tellurometer from Flinders Peak in the You Yangs to Black Springs Hill in Mooroolbark, Victoria, Australia. It turned out to be about 84km. Melbourne is about half way between the two points."
Nov 26, 2017
Doug Tarrant is on spot light
Jul 20, 2017
Doug Tarrant's discussion was featured

Trimble TSC3/S8 Stakeout a line

Hi All,If I am staking out a line which has elevations at each end, what can I expect to see on the screen in relation to difference in height to the line from my measured point. I'm happy with chainage/distance along the line and the offset from the line. I would really like to know how much below or above the line I am at the distance or chainage shown.Similarly if the same line is a breakline on a surface, loaded as a ttm file, is there a better way to do this.CheersDougSee More
Jul 20, 2017
Doug Tarrant's discussion was featured

Trimble TSC3/S8 Stakeout a line

Hi All,If I am staking out a line which has elevations at each end, what can I expect to see on the screen in relation to difference in height to the line from my measured point. I'm happy with chainage/distance along the line and the offset from the line. I would really like to know how much below or above the line I am at the distance or chainage shown.Similarly if the same line is a breakline on a surface, loaded as a ttm file, is there a better way to do this.CheersDougSee More
Jun 4, 2017
Doug Tarrant is on spot light
Feb 24, 2017
Doug Tarrant replied to Akinboyewa Temitope Ezekiel's discussion Geodetic levelling
"The choice of change points is critical. I tell my chainperson a change point must pass two tests. First if you kick it and it does not move, fine. Secondly if, when you place the staff on the change point and spin it around, it pivots on the same…"
Feb 24, 2017
Doug Tarrant's discussion was featured

Topcon Site calibration/localisation

I am lead to believe Topcon GPS users may only calibrate for elevation on three, or is it four, control points to establish a localised level datum and that the result is an inclined plane of best fit between the control points. I am also lead to believe the option to maintain a "constant adjustment" is not available as it is with Trimble stuff. What happens if one or two of the points is in error vertically or if these "one or two" points were not officially issued as "control"? Answer..."it"…See More
Feb 16, 2017
Doug Tarrant replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"Ha Mr Allen, and they don't appreciate how hard it was sometimes to measure just a hundred metres through scrub and bush over hill and dale either. Mr Cavell your average dozer driver would not understand the concept of level and horizontal. In…"
Feb 16, 2017
Kevin D. Allen replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"Yup - I should clarify - back in the "day" when RTK was new - I was one of the first in Indiana to use the Sokkia/Ashtech system dual-freq system that had the old SDR-33 data collector running the total station, digital level AND the…"
Feb 16, 2017
J. Anthony Cavell replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"The "mind bending" part is that the inclined plane IS level; is normal to the direction of a  plumb bob. The simple geometric position given by GPS doen't know which way the blumb bob hangs; doesn't know which way is down.…"
Feb 16, 2017
Kevin D. Allen replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"I always used "constant" - I could never get over the idea of an "inclined" plane being level"
Feb 16, 2017
Doug Tarrant replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"Some interesting replies, thank you all. I've got the basic rules down pat, after 50 odd years it's just difficult to come to grips with the notion of level datum plane not being horizontal over a small area i.,e., the RL of the datum…"
Feb 16, 2017
Kevin D. Allen replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"As a basic rule of plane geometry - you should always hit at least 4 points when calibrating.  Otherwise the routine  being used will or could show a perfect fit of the three points to the vertical plane.  By using four or more points…"
Feb 15, 2017
Evans Mwale replied to Doug Tarrant's discussion Topcon Site calibration/localisation
"I do agree with you JAC"
Feb 15, 2017
Evans Mwale favorited Doug Tarrant's discussion Topcon Site calibration/localisation
Feb 15, 2017

Profile Information

I am here because I am a.
Just a surveyor
Surveyor Bio:
44 years of old fashioned surveying but now confronted with new fangled methods (GPS. I need to associate with knowledgable folk or at least folk in the same predicament!
Location for Member Map
37.4604S145.1930E
I have experience with the following
GPS, cadastral, topographic, boundary surveys, construction staking, topographic surveys, control network surveys, ground movement monitoring, Aerial, Construction
How many years have you been surveying?
44years/8
Most comfortable with the following types of instrumentation
Total Stations, Surveying Software, Robotics, Automatic Levels, 3D scanners, Old school surveying, theodolite, Chain, compass

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