Stop-and-go survey – are we there yet?

@fgnievinski wrote:

Greetings. The release notes for ReachView v2.11.0 mention the following new feature:

Surveying: point collection start and end times are saved into the project

I’m interested in the so-called post-processed stop-and-go survey mode (PP-S&G), in which you’d occupy each GCP for some time before moving on to the next GCP, while keeping the GPS unit upright and logging raw data all along.

I was wondering if the time stamps are exported only in the list of position coordinates or also in the raw RINEX data?

Time stamps in the coordinates would allow us to isolate the points that belong to a given feature more easily. Instead of trying to visually find a cluster on the map, we could break up the series at the exact occupation start and end times.

But AFAIK the actual averaging is currently implemented only very crudely in RTKLIB. First because you have to manually select the occupation period for each of multiple GCP. Second because RTKPLOT’s “Show Statistics” setting performs a simple mean instead of a weighted one.

Now, if ReachView would output time stamps in the raw RINEX data, I could import it into any other post-processing software (e.g., Topcon Tools) and the weighted average would be calculated automatically and separately for each GPC. The RINEX standard offers the MARKER NAME and MARKER NUMBER records exactly for that purpose.

In summary, I’m hoping that I could use Emlid Reach RS for PP-S&G data collection, even though I understand that RTKLIB doesn’t fully support this feature yet.

Below I give links to related discussions, here and elsewhere.

Thanks,
-FGN.

Related discussions elsewhere:
https://lists.osgeo.org/pipermail/foss-gps/2015-November/001490.html
https://lists.osgeo.org/pipermail/foss-gps/2015-April/001353.html

Related code:
https://github.com/tomojitakasu/RTKLIB/blob/master/app/rtkplot/plotdraw.cpp
https://github.com/tomojitakasu/RTKLIB/blob/master/app/rtkplot/plotcmn.cpp

Related threads:
https://community.emlid.com/t/reachview-v2-11-0-our-second-stable-release/9473/3
https://community.emlid.com/t/survey-point-raw-log/8787/13
https://community.emlid.com/t/ppk-stop-and-go-methodology-needed/9298/3
https://community.emlid.com/t/collecting-gcp-in-field-need-suggestions/4916/8

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