PPK corrected data for GCPs or ground survey

Hello,

We are a drone operator doing mainly drone mapping using Phantom 4 pro with Emlid RS2 unit to pick up GCPs.

We correct our data via CORS Stations network doing PPK in RTKLib.

My question is quite clear : is there a simple way to get the survey .CSV file PPK-corrected ? In other words does RTKLib provides you with a solution CSV or TXT file related to your survey ? Is there a way to extract PPK-corrected data from the survey ?

The event.pos file is always empty (and according to what I have read on this forum the event.pos file is created to work in specific configurations like hotshoe on a camera or a drone).

Thanks in advance for your help.

Regards,

Luc

There are several solutions, here are 3 options going from free but time consuming to dang nice and fast, but quite expensive:

  • Load the resulting POS file into RTKplot. Input start-stop time, center plot, and add waypoint. You can now copy/paste your coordinate out.
  • use this PPK point extractor software . Use your resulting POS file along with the Csv file, and run it through the app.
  • EzSurv takes your base, rover + your csv file and spits out all your points, with very few clicks. Can also compare RTK positions and PPK positions as blunder checks and so on.
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You could also use interuptor on the time mark pin to create a time event during ppk, which is easy to line up and identify on the timeline of the plot. Somewhat nasty hack but it works.

@wizprod thanks for these solutions PPK Point extractor software seems to be the best option for me. However do you know if it takes in account the ~20seconds difference between GPS Time and UTC Time when averaging data for a point ?

@TB_RTK Thnaks, that seems to be a good option, and I understand the expected result. However I am not sure to fully understand how to proceed to do so, could you be more specific ?

Yep, both the Extractor and EzSurv (can) take this into account.

Using gnd and event from this layout with a fast snapping switch does the trick.

I just start and stop the log like I am taking a shot. Then I can process each point by itself. Probably a little to manual for more than 20-25 GCP’s… but then again how many times do you need to do that for a project? I takes less than 5 minutes per point.

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