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Kansas Land Surveyors Conference. OPUS, OPUS-RS, and OPUS-DB Dave Zenk NGS Advisor October 29, 2010 Wichita, KS. What is OPUS?. OPUS is an acronym for: Online Positioning User Service (OPUS) It started as a service for Static GPS users and has grown from there to serve other users.

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Kansas land surveyors conference

Kansas Land Surveyors Conference

OPUS, OPUS-RS, and OPUS-DB

Dave Zenk

NGS Advisor

October 29, 2010

Wichita, KS


What is opus

What is OPUS?

  • OPUS is an acronym for:

    • Online Positioning User Service (OPUS)

  • It started as a service for Static GPS users and has grown from there to serve other users.

  • Designed to work with minimal data input from user and be as fully automated as possible.

  • Only a Web Browser and Email needed to use.

  • Fast, easy, consistent access to NSRS.


Many flavors of opus planned

Many Flavors of OPUS Planned

  • OPUS-S (static)

    • $$$ receiver, hours of data

  • OPUS-RS (rapid static)

    • $$$ receiver, minutes of data

  • OPUS-DB (database)

    • $$$ receiver, hours of data, share results

  • OPUS-Projects – not released

    • Multiple $$$ receivers, share results

  • OPUS-GIS – not released

    • ¢¢ receiver, minutes of data

  • OPUS-Leveling – not released


  • Opus has been popular

    OPUS has been popular


    Opus has been popular1

    OPUS has been popular


    Areas covered by opus

    Areas covered by OPUS


    Areas covered by opus1

    Areas covered by OPUS


    Areas covered by opus2

    Areas covered by OPUS


    How does opus work

    How does OPUS work?

    • Each OPUS ‘flavor’ is a bit different

    • Let’s start with OPUS-S

    • Then, we’ll highlight the differences in

      • OPUS-RS

      • OPUS-DB

      • OPUS-Projects


    Opus s

    OPUS-S

    • OPUS-Static, (formerly just called OPUS and sometimes now called OPUS-CLASSIC)

    • Basic Steps

      • Submit GPS data to OPUS Web site

      • Processed automatically on NGS computers

        • Ties to 3 CORS stations

      • Solution via email - in minutes

      • Fast, easy, consistent access to NSRS


    Opus guidelines

    OPUS Guidelines

    • Email address for results

    • Data file with 2 hrs to 48 hrs of GPS L1/L2 data

      • Static GPS observations only

      • 30-second epochs processed

      • not approved for less than 2 hrs of data, but you can try

    • Antenna type/phase model

    • Antenna height from mark-to-ARP vertical


    Opus website all flavors

    OPUS Website (all flavors)

    • http://www.ngs.noaa.gov/OPUS/


    Opus screen layout

    OPUS Screen Layout

    e-mail

    GPS file

    antenna type

    antenna height

    options

    OPUS-S

    (2 hr)

    OPUS-RS

    (15 min)


    Opus inputs

    OPUS Inputs

    • Email – [email protected]

    • GPS file - .dat or Rinex (.obs)

      • you may zip several files together

      • IF they all have same antenna type and antenna height.

      • Antennas need not be same serial numbers

    • Antenna Type – TRM41249.00 (choose from list)

    • Antenna Ht – vertical measure from mark to ARP

    • Options – next 2 slides…


    Opus inputs options 1 2

    OPUS Inputs (OPTIONS 1 & 2)

    specify

    SPCS

    specify

    CORS


    Opus inputs options 3 4 5

    OPUS Inputs (OPTIONS 3, 4, & 5)

    Specify GEOID model:

    Auto

    GEOID09

    GEOID03

    Choose OUTPUT type

    Choose XML or not


    Opus inputs options 6 7 8

    OPUS Inputs (OPTIONS 6, 7, & 8)

    OPUS-Projects Keyword

    Set USER Profile

    Choose PUBLISH and Submit


    Kansas land surveyors conference

    • Antenna Height

    • true vertical distance

    • measured in meters

    ARP

    MARK


    Opus positions

    CORS B

    CORS A

    +

    CORS C

    OPUS Positions

    • NGS PAGES processing software

    • Ionospheric-free solution

    • Tropospheric scale height adjusted

    • Fixed ambiguities

    • Average of 3 unique CORS ties

    • ITRF & NAD83 coordinates/errors

    Average


    Opus report

    OPUS Report


    Opus report check results

    OPUS Report – check results

    • > 90% observations used

    • > 50% ambiguities fixed

    • < 3 cm overall RMS

    • check ephemeris type

    • check antenna info

    • < 5 cm peak-to-peak errors

    …and which CORS were used? …

    resubmit later for better CORS scenario & ephemeris


    Opus extended output

    OPUS Extended Output

    • HTDP-transform CORS ITRF coordinates from published epoch to session midpoint

    • remote station ITRF solution from each CORS

    • G-files – vector components, standard deviations, & correlations for each vector

    • post-fit RMS & # observations per satellite/vector

    • solution covariance matrix-relates errors in each coordinate to every other coordinate

    • network accuracies - H & V

    • summary of NAD83 derivation

    • SPC feet values, if available for user’s state


    Opus rs rapid static

    OPUS-RS (Rapid Static)

    • 15-minute sessions minimum, 4 hr maximum

    • ties to 3 – 9 CORS (< 250km)

    • uses RSGPS vs. PAGES software

    • P1/P2 code & L1/L2 phase observations

    • resolves all ambiguities with LAMBDA

    • similar to Real-Time Network computations

    • RSGPS solution modes:

      • network: solves ambiguities, tropo, iono

      • rover: tropo and ion interpolated to rover

    • ~10,000 lines of code


    Opus rs geographical coverage 15 minute session

    Don’t use OPUS-RS outside areas where insufficient CORS exist.

    OPUS-RS geographical coverage (15 minute session)


    Opus rs geographical coverage 60 minute session

    OPUS-RS geographical coverage (60 minute session)

    • Don’t use OPUS-RS outside areas where insufficient CORS exist.


    Opus rs output

    OPUS-RS Output

    NGS OPUS-RS SOLUTION REPORT

        USER: [email protected]                 DATE: October 29, 2007 RINEX FILE: 1207287x.07o                         TIME: 14:39:04 UTC  SOFTWARE: rsgps  1.09 RS11.prl 1.12     START: 2007/10/14 23:27:15 EPHEMERIS: igr14490.eph [rapid]                     STOP: 2007/10/15 00:00:15 NAV FILE:brdc2870.07n                        OBS USED:  1962 /  2082   :  94% ANT NAME:ASH701975.01A                 QUALITY IND.  34.21/ 37.91

    ARP HEIGHT: 0.0                           NORMALIZED RMS:0.307  REF FRAME: NAD_83(CORS96)(EPOCH:2002.0000)    ITRF00 (EPOCH:2007.78627)     LAT:36  2 52.79767      0.008(m)       36  2 52.81498    0.008(m)      E LON:  252  2 18.45532    0.013(m)       252  2 18.41156    0.013(m)      W LON:  107 57 41.54468  0.013(m)       107 57 41.58844     0.013(m)      EL HGT:         1974.304(m)   0.005(m)       1973.396(m)   0.005(m)  ORTHO HGT:         1995.280(m)   0.026(m) [Geoid03 NAVD88]

    *

    • “#Fixed Ambiguities” replaced by “Quality Indicator”

      • average of W-ratio (separation between candidate sets of ambiguities) of last 3 epochs

      • reported as network mode / rover mode

      • look for values > 3 for confidence in solution


    Opus rs output1

    OPUS-RS Output

    NGS OPUS-RS SOLUTION REPORT

        USER: [email protected]                 DATE: October 29, 2007 RINEX FILE: 1207287x.07o                         TIME: 14:39:04 UTC  SOFTWARE: rsgps  1.09 RS11.prl 1.12     START: 2007/10/14 23:27:15 EPHEMERIS: igr14490.eph [rapid]                     STOP: 2007/10/15 00:00:15 NAV FILE:brdc2870.07n                        OBS USED:  1962 /  2082   :  94% ANT NAME:ASH701975.01A                 QUALITY IND.  34.21/ 37.91

    ARP HEIGHT: 0.0                           NORMALIZED RMS:0.307  REF FRAME: NAD_83(CORS96)(EPOCH:2002.0000)    ITRF00 (EPOCH:2007.78627)     LAT:36  2 52.79767      0.008(m)       36  2 52.81498    0.008(m)      E LON:  252  2 18.45532    0.013(m)       252  2 18.41156    0.013(m)      W LON:  107 57 41.54468  0.013(m)       107 57 41.58844     0.013(m)      EL HGT:         1974.304(m)   0.005(m)       1973.396(m)   0.005(m)  ORTHO HGT:         1995.280(m)   0.026(m) [Geoid03 NAVD88]

    *

    • “Overall RMS” replaced by “Normalized RMS”

      • unitless quantity, “expected” = 1

      • aka standard deviation of unit weight

      • if > 1, noisy data somewhere

      • typically <1, meaning noise less than expected


    Opus rs output2

    OPUS-RS Output

    NGS OPUS-RS SOLUTION REPORT

        USER: [email protected]                 DATE: October 29, 2007 RINEX FILE: 1207287x.07o                         TIME: 14:39:04 UTC  SOFTWARE: rsgps  1.09 RS11.prl 1.12     START: 2007/10/14 23:27:15 EPHEMERIS: igr14490.eph [rapid]                     STOP: 2007/10/15 00:00:15 NAV FILE:brdc2870.07n                        OBS USED:  1962 /  2082   :  94% ANT NAME:ASH701975.01A                 QUALITY IND.  34.21/ 37.91

    ARP HEIGHT: 0.0                           NORMALIZED RMS:0.307  REF FRAME: NAD_83(CORS96)(EPOCH:2002.0000)    ITRF00 (EPOCH:2007.78627)     LAT:36  2 52.79767      0.008(m)       36  2 52.81498    0.008(m)      E LON:  252  2 18.45532    0.013(m)       252  2 18.41156    0.013(m)      W LON:  107 57 41.54468  0.013(m)       107 57 41.58844     0.013(m)      EL HGT:         1974.304(m)   0.005(m)       1973.396(m)   0.005(m)  ORTHO HGT:         1995.280(m)   0.026(m) [Geoid03 NAVD88]

    *

    *

    • Peak-to-Peak replaced by Est. Standard Deviations

      • approximately 95% confidence

      • derived from scatter of single baseline solutions

      • formal standard deviations (optimistic) available in Extended Output


    Opus rs station selection

    OPUS-RS Station Selection


    Opus rs interpolative dilution of precision idop

    OPUS-RS Interpolative Dilution of Precision (IDOP)

    OPUS-RS accuracy is dictated by CORS geometry and distances

    IDOP = local CORS geometry relative to rover location

    [min = 1/sqrt(#CORS)]

    RMSD – CORS distances

    * Forthcoming paper in “GPS Solutions” –

    Accuracy Assessment of the NGS’s OPUS-RS Utility

    By C. Schwarz, R. Snay, & T. Soler


    Expected opus rs standard error values in e or n dimension

    Expected OPUS-RS Standard Error Values in E or N Dimension:


    Opus rs usage

    OPUS-RS Usage


    Opus rs questions

    OPUS-RS Questions


    Opus db database

    OPUS-DB (database)

    • OPUS-DB recently let loose “in the wild”

    • Means you can use it now

    • Intended to be a way for surveyors to

      • access NSRS,

      • maintain the existence of the mark, and

      • optionally share results with others.

    • Works with OPUS or OPUS-RS


    Opus db http www ngs noaa gov opus

    OPUS-DBhttp://www.ngs.noaa.gov/OPUS/


    Opus db

    OPUS-DB


    Opus db 3 tabs

    OPUS-DB --- 3 Tabs

    • Upload

      • Similar to other OPUS flavors

    • View

      • use to retrieve marks from the database

    • About

      • wealth of detail on OPUS system


    Opus db upload

    OPUS-DB Upload


    Opus db upload option 7

    OPUS-DB Upload/Option #7


    Opus db upload option 71

    OPUS-DB Upload/Option #7

    • Choose YES, Publish or NO, Don’t Publish

    • The NO option is same as OPUS-S or OPUS-RS

    • The YES option followed by a choice of OPUS-S or OPUS-RS button will bring up a Step 2 screen to identify your mark…

    • Either Describe NEW or Describe Recovered Mark or Abort


    Opus db step 2

    OPUS-DB Step 2


    Opus db step 3

    OPUS-DB Step 3

    • If you choose NEW, you must fill in the required fields and have 2 photos (small .jpg files)

    • If you choose Existing you need to know the mark identity (PID)


    Opus db step 3 existing mark

    OPUS-DB Step 3 existing mark


    Opus db step 3 new mark

    OPUS-DB Step 3 new mark


    Opus db step 4

    OPUS-DB Step 4


    Opus db approval email

    OPUS-DB Approval Email

    “The following contribution has been submitted to OPUS for publication in the

    OPUS Database. Please visit the link below to verify that the information

    you provided is correctly presented on the new datasheet.

    When the datasheet is viewed, two buttons will be displayed at the top of the

    new datasheet web page. Please select the appropriate button to accept or

    withdraw your contribution. An action must be taken for the datasheet to be

    published or withdrawn.”

    The OPUS Team.

    RINEX FILE:

    DESIGNATION: BARB RESET

    http://beta.ngs.noaa.gov/OPUS/getFeedback.jsp?id=000478336


    Opus db final approval and sample datasheet

    OPUS-DB Final Approval and Sample Datasheet

    Last Chance to Abort


    Opus db usage

    OPUS-DB Usage


    Recent opus results on a real project

    Recent OPUS Results on a Real Project

    • USGS is monitoring the long term effects of an oil spill in northern Minnesota.

    • They had been using an assumed basis of coordinates for horizontal and vertical surveys.

    • Their GIS analyst was having trouble combining the data with other maps in the area.

    • They asked for NGS help in getting connected to the NSRS.


    Recent opus results on a real project1

    Recent OPUS Results on a Real Project

    • We decided that the best end result would be

      • Bluebooked First Order horizontal project (GPS)

      • Bluebooked Second Order Class 1 vertical (leveling)

    • But, we also wanted to compare OPUS and OPUS-RS results.


    Recent opus results on a real project2

    Recent OPUS Results on a Real Project

    Project Area


    Recent opus results on a real project3

    Recent OPUS Results on a Real Project


    Recent opus results on a real project4

    Recent OPUS Results on a Real Project


    Recent opus results on a real project5

    Recent OPUS Results on a Real Project

    MONIQUE

    BUD

    DIVA

    BEAST


    Recent opus results on a real project6

    Recent OPUS Results on a Real Project

    Note: 0.0001 sec = 0.01 feet (approx)

    Delta Lat = +/- 0.02 feet

    Delta Lon = +/- 0.02 feet

    Delta EllHt= +/- 0.06 feet

    Delta Elev= +/- 0.05 feet


    Recent opus results on a real project7

    Recent OPUS Results on a Real Project

    Note: 0.0001 sec = 0.01 feet (approx)

    Delta Lat = +/- 0.02 feet

    Delta Lon = +/- 0.02 feet

    Delta EllHt= +/- 0.05 feet

    Delta Elev= +/- 0.05 feet


    Recent opus results on a real project8

    Recent OPUS Results on a Real Project

    Note: 0.0001 sec = 0.01 feet (approx)

    DIVA was “in the trees” for session 175A !

    Delta Lat = +/- 0.02 feet

    Delta Lon = +/- 0.06 feet

    Delta EllHt= +/- 0.22 feet

    Delta Elev= +/- 0.12 feet


    Recent opus results on a real project9

    Recent OPUS Results on a Real Project

    Note: 0.0001 sec = 0.01 feet (approx)

    Delta Lat = +/- 0.02 feet

    Delta Lon = +/- 0.04 feet

    Delta EllHt= +/- 0.10 feet

    Delta Elev= +/- 0.06 feet


    Sample opus rs results for monique

    Sample OPUS-RS Results for MONIQUE

    BASE STATIONS USED

    PID DESIGNATION LATITUDE LONGITUDE DISTANCE(m)

    DK6380 PNR6 PINE RIVER 6 CORS ARP N465148.582 W0944321.276 83771.9

    DL6147 MNTF THIEF RIVER FALLS CORS ARP N480708.945 W0961226.664 103381.6

    DK7743 MNGP GRAND RAPIDS CORS ARP N471324.958 W0932902.622 127200.3

    DK6503 MNEM EMILY CORS ARP N464116.993 W0935716.192 130803.9

    DM2668 MNRV ROOSEVELT CORS ARP N484721.797 W0950304.460 135098.2

    DI0729 MORH CLAY COUNTY COOP CORS ARP N465303.127 W0964549.588 148333.0

    DK6509 MNJC JACOBSON CORS ARP N465841.840 W0931625.269 152435.1

    DK6505 MNFF FERGUS FALLS CORS ARP N461624.936 W0960320.668 162350.5

    DM2664 MNDN DONALDSON CORS ARP N483420.485 W0965452.722 175605.3


    Sample opus rs results

    Sample OPUS-RS Results

    Residuals of position determined by individual

    baselines from the final position (meters)

    East North Up

    pnr6 -0.001 -0.001 -0.005

    mntf -0.001 -0.004 -0.010

    mngp 0.005 0.005 -0.003

    mnem 0.002 0.002 -0.012

    mnrv 0.010 0.003 -0.009

    morh -0.018 0.005 0.024

    mnjc 0.000 -0.000 0.036

    mnff -0.006 0.002 0.025

    mndn 0.005 -0.008 0.003


    Questions

    Questions

    • Dave Zenk PE, PLS

    • National Geodetic Survey Advisor

    • Office of Land Management, Geodetic Unit

    • 395 John Ireland Blvd., MS 641

    • Transportation Bldg.

    • St. Paul, MN 55155

    • 651-366-3523 phone

    • 651-366-3444 fax

    • 612-414-9522 mobile

    • [email protected] (NGS email)

    • [email protected] (MNDOT email)

    • [email protected] (personal email)


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