iG5 User Manual
44
http://geodesy.noaa.gov/OPUSI/Plots/Gmap/OPUSRS_sigmap.shtml
is updated routinely and reflects the probability that an
occupation at a given location will be successful and predicts
a best case accuracy for a 15-minute or 1-hour occupation.
In some areas there is a risk that if a single CORS site is
unavailable, your OPUS-RS job will not be processed.
25% of all submitted OPUS-RS occupations fail. Please read
the “Best OPUS Practices for New and Experienced Users”
section of this User Manual on page 50. It will save you time
and failed jobs.
OPUS-Projects
OPUS Projects is a relatively new online tool. Its use requires
taking a NGS training class. OPUS-Projects will allow you to
combine the observation files from multiple receivers and
multiple sessions.
There is an excellent article and video describing OPUS
Projects in the October 2013 ‘American Surveyor’ magazine.
Search for “OPUS
-
Projects: The Next Revolution in GPS” to
find a full resolution PDF.
OPUS Error Messages and Failures
There are lots of possible error messages when processing
OPUS solutions. It is our experience that almost all errors fall
into a single category:
“
There is not enough nearby CORS data to effectively
process your occupation…
yet.
”
