Christopher Eriksen
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GPS elevation issues

Started this discussion. Last reply by Donald E Robinson, PLS, CFS Dec 3, 2018. 6 Replies

Hello all,I am wondering if there are any other users out there with a Spectra SP80 GNSS receiver having issues with elevations in their survey data. We are adjusting to a published benchmark…Read more →

Tags: Topography, GNSS, GPS, SP80, Spectra

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GPS elevation issues

Hello all,I am wondering if there are any other users out there with a Spectra SP80 GNSS receiver having issues with elevations in their survey data. We are adjusting to a published benchmark elevation after running our Static over said benchmark for 20-30 minutes as a standalone survey and are tying down project control with both our Total Station and GPS receiver as well as running level loops over our initial control to establish elevations for the total station points. Overall, our projects…See More
Dec 4, 2018
Donald E Robinson, PLS, CFS replied to Christopher Eriksen's discussion GPS elevation issues
"It may be the position of the satellites at the time of observation.  If the satellites orientation are near the horizon you will get higher error for elevations. Check your PDOP (position dilution of precision)"
Dec 3, 2018
Peter Fonseca replied to Christopher Eriksen's discussion GPS elevation issues
"Yes sir...all the factors mentioned are all valid hence prepping the job in whatever program you used to calculate your points need to be the same datum and projection in the field process. Details like your HI and BS heights have to be addressed…"
Dec 3, 2018
Gary replied to Christopher Eriksen's discussion GPS elevation issues
"Another issue you may be having is simply relying on a RTN to be able to duplicate work tighter than most are capable. RTN's are great but I have found them to be inconsistent at best. I think a lot of people on here, whether they like RTNs or…"
Dec 3, 2018
Christopher Eriksen is on spot light
Dec 2, 2018
Peter Fonseca replied to Christopher Eriksen's discussion GPS elevation issues
"So I would start with making sure your measuring your Hi's to the correct mark on the rod. Then I would see if any adjustments were done for those points directly from caltrans or whomever if you know what I mean when you get a chance get off…"
Nov 30, 2018
Juan morales replied to Christopher Eriksen's discussion GPS elevation issues
"Try a diferential measuring beginning at an good benchmark, and apply the best geoid model that you can afford, things will be better¡¡¡"
Nov 30, 2018
Kevin Singer replied to Christopher Eriksen's discussion GPS elevation issues
"Two words: geoid model. You might also be adding to errors by using multiple base stations / reference systems."
Nov 30, 2018
Scott Miller favorited Christopher Eriksen's discussion GPS elevation issues
Nov 30, 2018
Christopher Eriksen refreshed their community profile
Nov 29, 2018
Christopher Eriksen posted a discussion

Spectra SP80 elevation issues

Hello all,I am wondering if there are any other users out there with a Spectra SP80 GNSS receiver having issues with elevations in their survey data. We are adjusting to a published benchmark elevation after running our Static over said benchmark for 20-30 minutes as a standalone survey and are tying down project control with both our Total Station and GPS receiver as well as running level loops over our initial control to establish elevations for the total station points. Overall, our projects…See More
Nov 28, 2018
Christopher Eriksen joined Jaybird's group
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May 19, 2018

Profile Information

I am here because I am a.
Surveyor
Surveyor Bio:
Experience in office and field combined with a background in civil design work.
Licenses Certifications or Awards
LSIT
I have experience with the following
GPS, topographic, boundary surveys, construction staking, topographic surveys, control network surveys, Survey Office, Construction
How many years have you been surveying?
10
Most comfortable with the following types of instrumentation
Total Stations, GPS, Surveying Software, Automatic Levels, GNSS, Old school surveying

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