I have two R10's, one of which has an RTX subscription. Very useful for the kind of work I do, among other things I use it when there is no cell coverage in a VRS area or in areas with no closeby CORS or VRS.?ÿ
One annoying issue is that every time I start a survey it disables the RTX data flow. I have to use the WebUI to turn it on in two places, one under MSS corrections (all are off) and then again under Receiver Configuration...Correction Controls...where all are disabled there as well.?ÿ
I would like to know WHY these are disabled. Seems to me if I have RTX onboard it can only help in any kind of survey. If I run static/fast static and turn on RTX, it winds up with a very accurate ITRF position at the end of the session, which if course helps in the post processing. I always run two post processing runs anyway, once with the C/A code positions, then hold one known station on ITRF and adjust, then process again ("coordinate seeding").?ÿ
Alternatively, is there a way to permanently enable the RTX corrections? I don't see a way, but maybe there is?
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Can't answer your question, BUT am interested in RTX and competing services ( TerraStar is provider for Leica, NovAtel and Septentrio) in the accuracy achievable, times required, datum's it works in, etc. Like you, I often find either no RTN, no CORS, no cell phone, something I could turn on and get coordinates seamlessly that match with other points based from say a RTN would be a fantastic tool. Often part of a large aerial control project has coverage of RTN and cell coverage and parts don't, obviously the satellite based corrections will be established independently of local control, how it all meshes together is the critical question?
Shelby: I used it a lot in Canada, very remote places, not sure how I would have done the project otherwise. I did occupy a few of their CBN stations (Pillars), and after transforming to NAD83 the fit was a couple of cm. And as I said I use it as a supplement where needed. I just finished a survey yesterday covering the western 1/4 of PA, West Virginia north to New York, all of the area is covered by VRS but not all of the area has cell service. Four points out of 135 I did both static and RTX, I like being able to use the RTX as you never know if the closest CORS is working or not. Other places like SD where CORS are scarce it really works well, a time saver.?ÿ
It stores the position as ITRF2008 epoch 2005.0. I have a program that reads the .jxl file, puts the data into a database, then exports ECEF ITRF XYZ, which I import into HTDP to convert to NAD83 (2011) epoch 2010.0. I then read the NAD83 (2011) XYZ back into the database, convert to lat/long/ellip hgt and UTM, and apply GEOID12B. Sounds like a lot of steps but in reality it takes about 1 minute no matter how many points I have, most of the time being taken up by setting the options (interactively) in HTDP. Of course you can do a calibration. Actually, that is the ONLY time I would consider doing a calibration to NAD83 control, I know some people do it routinely with RTK/VRS, not sure why.?ÿ
I did a project in Ecuador last year where there was no phone service, no nearby CORS, no positioning infrastructure at all. It was very high up, 12K to 14K feet, so no trees, once it converges you can survey all day, similar to RTK. On another trip to Ecuador I used it to stake to the equator and there was a rep from Hemisphere GNSS using their Atlas H10 service, they claim 8 cm accuracy, Trimble claims <4 cm (both 95%). I would say they both met those accuracies.?ÿ?ÿ
It functions very similar to RTK except for the convergence time (think initialization). That takes anywhere from 1 minute (central US up into Canada) up to about 10 to 15 minutes (Ecuador). You can init on a known point, but it must be known in ITRF2008 epoch 2005.0. It is more sensitive to obstructions and multipath than regular RTK, though.?ÿ
I don't need real time coordinates usually, but you can set the coordinate system in the Trimble DC to convert the ITRF2008 to NAD83 (2011) using built in transformation parameters. Not sure how well that would work given NAD83 velocities (small in the east, large where you are).?ÿ
To me it is well worth the (substantial) subscription cost. I wish they would offer weekly or monthly rates, Trimble only offers quarterly and annual. I have another R10 that it would be nice to be able to turn on RTX when needed, sort of pay-as-you-go.?ÿ
John, thanks, sounds very useful. My current gear won't work with such a service, BUT definitely a consideration on future gear. It is more the no cell or no RTN's where I work, can always set a local base, get OPUS on that and RTK or post process from there and is how I generally work in remote areas, HOWEVER jettisoning the base what be simpler (and safer) a lot of the time. Thanks for all the details!
Recently I've been looking into?ÿTrimble Centerpoint RTX, as I have an upcoming project in the Marshall Islands. This is way, way, way out in the middle of the ocean.?ÿ As far I can tell so far, this is literally hundreds of miles away from any?ÿRTN or CORS, and no cell phone.
Ideal for just such a situation.?ÿ
