I just received an e-mail from Trimble:
Due to the US government shutdown all NGS/CORS services are unavailable (UFCORS, CORS ftp).
This means that data cannot be postprocessed against CORS base stations or services unless the CORS data has previously been downloaded. It is currently unknown when the CORS data will become available again.
There is currently no method of getting the CORS base station data during the system outage. For postprocessing, it is advised that you use other reference base stations during this outage where available.
As an alternative for postprocessing static data, Survey customers can check out Trimble’s free CenterPoint™ RTX™ Postprocessing service, a global GNSS service providing <2 cm horizontal accuracy. For more information or to use the free service, go to www.trimblertx.com.
For more information please contact your Trimble Geospatial Distribution Partner.
I have not needed to try it but it appears to allow several Mfg. receiver options (listed here):Supported Antennaes
Of course, I just registered, for free, but I still have not submitted a file.
The advertised precision is <2 cm.
Works pretty well. I tried it on a few points with similarly acceptable results to OPUS.
Unfortunately, it only supports newer Trimble receivers. Data from one of my 4000SSi units was rejected as being from an unsupported device. 🙁
> Unfortunately, it only supports newer Trimble receivers. Data from one of my 4000SSi units was rejected as being from an unsupported device.
[irony] Yeah, but how could Trimble possibly know how to process L1/L2 observations from one of their own products? I mean once a product is "unsupported", it never happened, right? [/irony}
See: http://gpsworld.com/7-free-alternatives-opus-post-processing-in-government-shutdown/
for some hints on how to get TrimbleRTX to process data from other receivers,
I use TEQC to stuff the RINEX header with a supported device and a supported antenna.
In RTX, I believe that "TRIMBLE 5700II" is a great receiver to spoof. I don't think that RTX makes any changes based on the receiver, it just checks to make sure it is supported.
For the antenna, I suggest that you choose "TRM55971.00 NONE". You can look up the difference between your actual antenna's L1 phase center offset and the 55971's (which is 85.0mm.
With a spoofed receiver, a spoofed antenna, and an adjusted HI you should be good to go.
Or just use AusPOS which is just as good with less hassle.
M
