The OPUS-DB Experience

User and NGS perspectives

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

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/

Why reinvent bluebooking?

GPS data Observation log description formphoto(s)

NGS website:

OPUS-DB

DATASHEET

NGS magic

OPUS-DB OBSERVATION DATA STREAM

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)

The OPUS-DB Experience

1. user registers2. NGS approves

3. user uploads

4. NGS reviews

5. user approves

6. NGS approves

LIVE!

The OPUS-DB Experience

1. user registers

2. NGS approves3. user uploads

4. NGS reviews

5. user approves

6. NGS approves

The OPUS-DB Experience

1. user registers

2. NGS approves

3. user uploads4. NGS reviews

5. user approves

6. NGS approves

LIVE!

The OPUS-DB Experience

1. user registers

2. NGS approves

3. user uploads

4. NGS reviews5. user approves

6. NGS approves

1. user registers

2. NGS approves

3. user uploads

4. NGS reviews

5. user approves6. NGS approves

The OPUS-DB Experience

LIVE!

The OPUS-DB Experience

1. user registers

2. NGS approves

3. user uploads

4. NGS reviews

5. user approves

6. NGS approves

Bench mark elevation retained

Position accuracy improved 95 feet!

One more tie between GRS80-NAVD88.

OPUS-DB benefits

• Data submittal– Faster– cheaper

• Consistent data processing• Improve maintenance of NSRS

– Add GPS on bench marks– Archive PLSS corners?

• 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

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

• 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