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The OPUS-DB Experience
User and NGS perspectives
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How to Access NSRS
1) Passive monuments– Datasheets http://geodesy.noaa.gov/cgi-bin/datasheet.prl
2) Active GPS– CORS data http://geodesy.noaa.gov/CORS– OPUS processing http://geodesy.noaa.gov/OPUS
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How to Maintain NSRS
1) Passive monuments– Add observations via BLUEBOOKING– Online recovery recvy_entry_www.prl– Online GPS observations via OPUS-DB
2) Active GPS– Join Cooperative CORS http://geodesy.noaa.gov/CORS/Coop/
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Why reinvent bluebooking?
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GPS data Observation log description formphoto(s)
NGS website:
OPUS-DB
DATASHEET
NGS magic
OPUS-DB OBSERVATION DATA STREAM
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Simple is better!
A comparison: Files used:(create, sort,
maintain)
Required Metadata
(input)
Programs used:(learn, run, maintain)
BLUEBOOK
16 files
378 elements
26 programs
OPUS-DB2 files
(GPS data + photo)
15 elements
1 program
(internet browser)
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The OPUS-DB Experience
1. user registers2. NGS approves
3. user uploads
4. NGS reviews
5. user approves
6. NGS approves
LIVE!
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The OPUS-DB Experience
1. user registers
2. NGS approves3. user uploads
4. NGS reviews
5. user approves
6. NGS approves
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The OPUS-DB Experience
1. user registers
2. NGS approves
3. user uploads4. NGS reviews
5. user approves
6. NGS approves
LIVE!
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The OPUS-DB Experience
1. user registers
2. NGS approves
3. user uploads
4. NGS reviews5. user approves
6. NGS approves
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1. user registers
2. NGS approves
3. user uploads
4. NGS reviews
5. user approves6. NGS approves
The OPUS-DB Experience
LIVE!
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The OPUS-DB Experience
1. user registers
2. NGS approves
3. user uploads
4. NGS reviews
5. user approves
6. NGS approves
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Bench mark elevation retained
Position accuracy improved 95 feet!
One more tie between GRS80-NAVD88.
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OPUS-DB benefits
• Data submittal– Faster– cheaper
• Consistent data processing• Improve maintenance of NSRS
– Add GPS on bench marks– Archive PLSS corners?
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• GPS data only• PAGES software only• No direct tie to adjacent monuments• No redundancy• Reduced oversight• Idiot-proofing?• Field logs are not archived
OPUS-DB limitations
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OPUS-DB data quality
• Registered, trained users• 4+ hours of static GPS• OPUS error checking• NGS reviews each submittal• Datasheet includes:
– “Caveat emptor” warning– Datasheet includes DQA statistics– Agency attribution
• Coordinates: first, best, average
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• OPUS» $$$ receiver, hours of data
• OPUS-DB
» $$$ receiver, hours of data, share resultsshare results• OPUS Projects
» MultipleMultiple $$$ receivers, share results• OPUS Rapid Static
» $$$ receiver, minutesminutes of data• OPUS GIS
» ¢¢ receiver¢¢ receiver, minutes of data
Many Flavors of OPUS Planned