Hello there!
I have my ntrip server running got it hooked up to my Carlson surveyor 2. I got the coordinates for my closest official survey monument and my results were horrible almost 1.5m off… the only thing I can think of is to re run my base coordinate survey-in and re summit it and try again? What are your thoughts??
Thank you!
Sixthsantos
What hardware (ZED board or RTK Product) are you using? What antenna?
I got the coordinates for my closest official survey monument
In the USA, if I’ve learned anything about the surveying industry, it’s that monuments are “always correct”, meaning: when it comes to lot lines and properties, everything is relative to monuments, lat/long be damned. Also, there is no such thing as lat/long/alt, it’s lat/long/alt/time because the globe is not static. The North American plate moves ~2cm a year (https://pnsn.org/outreach/about-earthqu … ic%20Ridge.). I do not know what monument you’re using or when it was surveyed. Personally, I gave up a long time ago trying to find coordinates for survey marks. I trust a 24 hour PPP survey using OPUS or CSRS to identify the location of a given point with extreme accuracy. Once that’s identified, then you can find the relative distances from that point with great accuracy.
I don’t know what your experience is so please correct me if I’m wrong.
Hello sparky,
I have the zed f9p rtk sma board with the esp32 and the top 106 antenna. My local city updates their survey monuments coordinates every few years and posts them online. We trust them on major jobs in the city for setting up our standard base stations. I agree on the plates moving every few years so I expected some variance in the measurement but 1.5m is quite a lot. I just checked my original log file from u-centre and it looks like I only did about 12 hours of logging Iam going to try the full 24 hrs and see if that fixes it.
Thank you!
Anthony Santos
That hardware should be fine. Checkout the GNSS station tutorial: https://learn.sparkfun.com/tutorials/ho … tation/all
24 hours will be got marginally better but not much. Are you doing PPP or a Survey-in? Survey in method is great for quick field measurements but you really need to log RAWX and post process for best accuracy.
Hello sparky,
I have setup for rawx ( used rtk conv)then sent to csrs, entered the coordinates (fixed mode). Hopefully it was just a glitch in the setup and this time around it’s corrected.
Thank you!
Sixthsantos
Hello sparky,
I ran the tests for 24hr and you were right they got better but very minimal down to 1.3 m now. After rereading the tutorial I noticed that the coordinates you received for csrs don’t match the ones you entered in u blox? Is there anything else you could recommend? I tried another monument and had the same results.
Thank you!
Sixthsantos
Are the coordinates for your monument in WGS84 or in another coordinate system? All SparkFun RTK products are on the WGS84 coordinate system. Sounds like your coords may be in something else. See this post: viewtopic.php?f=116&t=57934
FYI - I wrote up how I got our RTK Facet down to ~52mm accuracy: https://sparkfun.github.io/SparkFun_RTK … ification/
Sixthsantos, are you in Canada and using the Canadian Spatial Reference System (CSRC) coordinates? It’s my understanding the CRCS is essentially NAD83, and that reference system moves with the North American tectonic plate. Note that WGS84 does not move with the tectonic plate. NAD83 and WGS84 were very close back in 1983/84, but the plate keeps moving. The link sparky posted in his last post talks more about this and how to convert to/from and compare WGS84 & NAD83.
