Dave Drahn
  • Kailua Kona, HI
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Dave Drahn's Discussions

GPS vertical results varying too much

Started this discussion. Last reply by Anthony Calogero Aug 26. 12 Replies

I've got an old Trimble GPS setup - a classic Zephyr Geodetic, Trimark III, 5700 base with a 5800 rover.  I'm pretty much just using it for grading and building/utility location as we slowly build…Read more →

Subject Tags: datum, GPS

Prism offset, leica, trimble

Started this discussion. Last reply by Dave Drahn Apr 6. 2 Replies

I've been using Trimble Survey Controller 12.5 on a TSC2 with an old Zephyr/5700/5800/Trimark III setup and started setting that DC up to use with my Leica TCA1101+ total station today.  I have a new…Read more →

Subject Tags: Trimble, Leica, offset, prism

OPUS problems (or is it me?)

Started this discussion. Last reply by Dave Drahn Jun 2, 2016. 12 Replies

I set up my Zephyr Geodetic and 5700 receiver to collect fast static and let it sit for a couple hours - actually have done it 3 times now.  I've got the v2.32 fw on the receiver so it collects…Read more →

Very general question on rectifying a boundary that doesn't fit found monuments

Started this discussion. Last reply by Dave Drahn May 18, 2016. 6 Replies

I don't need to do this and I have some text that probably describes best practices in these cases, but just wondering about found monuments vs record corners.  It seems like there would be a number…Read more →

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Dave Drahn replied to Alex Urbina's discussion Firmware Trimble 5700
Nov 12
Dave Drahn replied to Alex Urbina's discussion Firmware Trimble 5700
"I use the same and updated to 2.32 last year for free. Trimble puts out an update utility, the firmware and instructions. Google it or search Trimble. If you don’t find it before I’m back in the office I’ll send you some links."
Nov 11
Dave Drahn favorited Tim Nelson's video
Sep 25
Dave Drahn's discussion was featured

GPS vertical results varying too much

I've got an old Trimble GPS setup - a classic Zephyr Geodetic, Trimark III, 5700 base with a 5800 rover.  I'm pretty much just using it for grading and building/utility location as we slowly build out our campus master plan.  Lately I've been spraying grading boundaries and shape lines for a couple excavators we have working on a detention basin on campus.I usually set up on an unknown point and calibrate the site to 2 known points (one mag nail in rock and one gin spike in pavement), using…See More
Sep 23
Kim Noblitt favorited Dave Drahn's discussion GPS vertical results varying too much
Sep 18
Dave Drahn's discussion was featured

GPS vertical results varying too much

I've got an old Trimble GPS setup - a classic Zephyr Geodetic, Trimark III, 5700 base with a 5800 rover.  I'm pretty much just using it for grading and building/utility location as we slowly build out our campus master plan.  Lately I've been spraying grading boundaries and shape lines for a couple excavators we have working on a detention basin on campus.I usually set up on an unknown point and calibrate the site to 2 known points (one mag nail in rock and one gin spike in pavement), using…See More
Aug 26
Anthony Calogero replied to Dave Drahn's discussion GPS vertical results varying too much
"If your site is small enough, you could put monuments (beacons) in around the perimeter of the site, and some spread out inside the site as check points. Use precise leveling to determine orthometric heights for all, then use the perimeter points to…"
Aug 26
Nitesh Shrestha replied to Dave Drahn's discussion GPS vertical results varying too much
"The instrument height should always measured accurately while setting up the base."
Aug 25
Kevin D. Allen replied to Dave Drahn's discussion GPS vertical results varying too much
"SV orbit data - some of the older GPS gear had to load the orbit data or "tracks" of the SV's.  Just like if you took a star shot, you have to have the correct date and time to apply your angle reading to the star.  use the…"
Aug 25
Dave Drahn replied to Dave Drahn's discussion GPS vertical results varying too much
"Great info.  Thanks, Kevin.  When you say "update the ephemeris", is that through checking that I'm using the latest firmware? Manually altering dat or job files?  Or something else?"
Aug 25
Dave Drahn replied to Dave Drahn's discussion GPS vertical results varying too much
"Thanks, all.  It sounds like I'll need to spend a little more setup time to (maybe) get more consistent results.  Good info."
Aug 25
Luann Glenn replied to Dave Drahn's discussion GPS vertical results varying too much
"Whenever I used GPS, I always check two or three known points from the very beginning. Then I'd go from there. "
Aug 25
Arie Lise, OLS, OLIP, Dipl.T. replied to Dave Drahn's discussion GPS vertical results varying too much
"I believe our 5800 is a single frequency receiver, so you are not getting the redundancy from using two bands like most of the modern GPS.  This will also contribute to your error."
Aug 25
Kevin D. Allen replied to Dave Drahn's discussion GPS vertical results varying too much
"Dave,  You sound like you are working in an old school RTK-GPS environment.  So I'll give you some old and dusty RTK-GPS tips that kept me out of trouble... for the most part that is - lol 1) When you are establishing a local frame…"
Aug 25
Anthony Whitlock replied to Dave Drahn's discussion GPS vertical results varying too much
"Occupy the known hub and tack that you previously set from now on, apply the appropriate GEOID Model for your location, calibrate to the two monuments that you have been all along, take a check shot on another known point and go from there.…"
Aug 25
J. Anthony Cavell replied to Dave Drahn's discussion GPS vertical results varying too much
"One can perform extremely accurate observations with GPS provided long occupations and repeated redundant observations. Indeed, the basis for the adjustment of the most recent realization of NAD83 is based on the CORS. Agan, the results will be…"
Aug 25

Profile Information

I am here because I am a.
Student
Surveyor Bio:
Studying for the LS
Company
TerraFormer
Location for Member Map
Hawaii (HI)
Licenses Certifications or Awards
AAS in civil engineering
I have experience with the following
GPS, topographic, construction staking, topographic surveys, teaching, Survey Office, Construction
How many years have you been surveying?
4
Most comfortable with the following types of instrumentation
Total Stations, GPS, Surveying Software, Robotics, Automatic Levels, GNSS, Old school surveying, theodolite, Lidar

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