Tag Archives: APPS

7 Free Alternatives to OPUS GPS Post-Processing During U.S. Federal Government Shutdown

This is a great article by Eric Gakstatter on alternatives to NGS OPUS (Static, Rapid Static or Projects):

7 Free Alternatives to OPUS GPS Post-Processing During U.S. Federal Government Shutdown ]

It is timely because all of the NGS websites, services, databases and tools are offline.

It is a great article because, well, I wrote most of it. (Check out my byline! I am published!)

Additionally, I sent out this [ newsletter ] this morning:

To stem the flood of calls, I want to warn everyone that the NGS OPUS system is unavailable (you know why.)
It is not clear if observation data is being accumulated during the shutdown; nor is it given that it can be ‘filled in’ when the NGS comes back online.
This means that all data that you collect during the Federal shutdown may not be processable in OPUS, even after the shutdown concludes.
Don’t despair, there are a number of similar online processing tools available. I have written a very detailed comparison of these tools, which was published in ‘GPS World’ online today:
Even without the current crisis, it is worth a read.
Please be aware that most of the alternative services will not do well with 15-minute observation files. I STRONGLY encourage you to collect at least 1-hour of observation data during the government shutdown in case OPUS-RS can’t fill in the gaps when NGS OPUS is reactivated!
If you are using the iGage/CHC X90-OPUS GPS Receiver [ more information here ]:
The latest X90 Download tool already supports direct submittal to RTX and AusPOS; two of the alternative services.
If you are using the X90-OPUS receiver and find that you want to use the excellent GAPS service (from the University of New Brunswick); you will need RINEX files with standard 8.3 filenames. The current Beta X90 Download tool has a checkbox to force 8.3 filenames on export. If you want to use GAPS, drop me a note and I will get you a copy of this beta tool, it will save you the hassle of manually renaming the files.

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