xiii
3.2
Verify Correct Antenna Model ................................................................................................................... 82
3.3
Observation Data Spans ............................................................................................................................. 83
3.4.1
Basic Hub Site Single Session Strategy ................................................................................................... 84
3.4.2
Basic Hub Site Strategy .......................................................................................................................... 84
3.5
The Normal Adjustment Sequence and NGS Specific Survey Types .......................................................... 86
3.5.0.1
Considering Constraint Weighting in Network Adjustments……………………………………………………….88
3.5.1
Height Modernization Surveys .............................................................................................................. 89
3.5.2
FAA Airport Surveys ............................................................................................................................... 90
3.5.3
Real-time Network Positioning .............................................................................................................. 90
3.6
What's Under the Hood - Processing Baselines with PAGES ...................................................................... 95
3.7
Adjusting Networks with GPSCOM ............................................................................................................ 95
3.8
Making Combined Adjustments ................................................................................................................. 95
3.8.1
Helmert Blocking.................................................................................................................................... 95
APPENDIX A. FAQ – TROUBLESHOOTING HELP ......................................................................................................... 97
APPENDIX B. USING VARIOUS INTERNET BROWSERS.................................................................................................. 99
APPENDIX C. SESSION SOLUTION AND NETWORK ADJUSTMENT SUMMARY REPORT ............................................. 102
APPENDIX D. PAGES (SESSION SOLUTION) PROCESS LOG ......................................................................................... 106
REFERENCES ............................................................................................................................................................... 116
Caution - Pay attention to items marked with this symbol as they may be of critical importance in
how you proceed as you work through a project.
User Instructions and Technical Guide
OPUS Projects
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NOAA | National Geodetic Survey
Noted changes to the program OPUS Projects
v2.5 - Update applied 7-8-15
GEOID12B added
OPUS Projects
User Instructions and Technical Guide
NOAA | National Geodetic Survey
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| 15
Introduction
History and Development of OPUS Projects
OP developed as a natural extension of OPUS. The ability to process geodetic networks has always been
present through software available from the NGS
Geodetic Tool Kit
(
http://geodesy.noaa.gov/TOOLS/
)
and the PAGES_NT package. OP enhances this capability by offering to the public a GNSS network
adjustment package with web-based access to simple visualization, management and processing tools
for multiple project marks and multiple occupations. OP performs best with projects of "short"
duration, i.e. "days to months" rather than "long" duration "months to years" because no a priori
velocity model is applied to project marks at this time. Some of its advantages include:
Data uploading through OPUS.
Coordinate results aligned to the NSRS.
Processing using the PAGES and GPSCOM software.
Graphical visualization and management aids including interactive maps, like the one shown in
Figure 1.0, using Google Maps™ mapping service. Google Maps and the Google logos are
registered trademarks of Google Inc., and used with permission.
Most Internet browsers may be used. Some display the map and project data faster than
others. Internet browser programming changes frequently. If you see an issue with one
browser then try another and refresh often.
Figure 1.0 - OP graphic visualization with interactive maps
User Instructions and Technical Guide
OPUS Projects
16 |
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NOAA | National Geodetic Survey
Optional
Session 1 -
RINEX Data
File
Session 2 -
Session 3 -
Session 4 -
Session 5 -
RINEX Data
OPUS
Solutions
Report
to Processor,
Manager
and/or Users
Data &
Metadata
Session
Person or
Manager
Session
Solution
Session
Solution
Session
Solution
Session
Solution
Bluebook to
IDB or Share
through
OPUS
Manager
Adjust
Network
Solution
Manager
Copy
to Manager
OPUS Projects Development Timeline
2005: Weston and Gwinn began initial development on OP.
2006: Several projects were completed as part of a proof-of-concept.
2007: Development restarted by Mark Schenewerk.
2009: Feedback from an invited group of participants resulted in a better defined set of desirable
capabilities.
2010: OP BETA released. First OP Workshop for Managers held in December
2012: Major programming upgrade completed 2012-11-27 by Mark Schenewerk.
Ability to create g-files and b-files (as part of “bluebooking”) added, to begin the
process of aligning OP with long-standing FGCS policy that only bluebooked data,
run through ADJUST, may be submitted to NGS for consideration of inclusion in
the NGS Integrated Database.
2013: OP became operational with an initial limited set of available tools.
OPUS Project Flowchart
The flowchart depicts the series of events that happen as you progress from uploading observation files
to OPUS, then process groups of project mark observations as sessions and finally adjust the sessions to
get the final network solution. Ultimately the project manager may elect to submit and bluebook to the
NGSIDB using the b- and g- output files (a process currently external to OP). The NGS encourages
managers to submit their project control marks to perpetuate their coordinates through time. As new
datum realizations develop, the NGS will automatically update the published coordinates on the
datasheets. This provides for an ever increasing number of marks that will be aligned with the National
Spatial Reference System (NSRS).
Figure 1.01 - OP flow chart
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