Taking Advantage of OPUS
Taking Advantage of OPUS Presented by Jeff Clark, PLS
Taking Advantage of OPUS Agenda • What is OPUS ? – Who operates the system ? – What does it do ?
• Processing Software – Static – Rapid Static – Kinematic not yet available
Taking Advantage of OPUS Agenda • How do I submit my data? – E-mail address, Data File, Antenna Type, Antenna Height, and Options
• How do I interpret the results? – Ephemeris used, observations used, fixed ambiguities, overall RMS
• Review Questions
What is OPUS ? • Online Positioning User Service – System is operated by National Geodetic Survey. – Processes your GPS data files. Glonass or Galileo observables may be included; though only the GPS are used. – Utilizes the same models and tools used to manage the National CORS Network.
Processing Software • Static – Data files must contain at least 2 hours but not more than 48 hours, but not crossing UTC midnight more than once. – PAGES Software
– Coordinates are averaged from three independent single-baseline solutions.
Processing Software • Rapid Static – Data files must contain at least 15 minutes but not more than 2 hours. Data files must include the P2 and either P1 or C1 observables. – RSGPS Software • Employs more aggressive algorithms. • More stringent data continuity and geometry requirements. • Will NOT work in many remote areas of the country.
www.ngs.noaa.gov/OPUS OPUS: Online Positioning User Service
Submitting to OPUS • Choose Observation File • Choose Your Antenna Type • Enter Antenna Height & e-mail address
Submitting to OPUS • Data File – Data file can be in any GPS observable format which has been converted to RINEX. – Files can also be compressed, including multiple files in a single zip archive. – Files can be collected at Epoch rates of 1,2,3,5,10,15 or 30 seconds, however all will be decimated to 30 seconds for processing.
Submitting to OPUS • Antenna Type – Must be correct. NGS uses absolute antenna calibrations.
Submitting to OPUS • Antenna Height – Measured in meters. – Measured to the bottom of antenna mount. Vertical measurement, no slant heights.
Submitting to OPUS • Options – Allow customization of the processing and reporting. – Selections override OPUS defaults. – Should only be employed by experienced users.
Submitting to OPUS • Options – Select State Plane Coordinate Zone
– Draft XML Output • Can be utilized with processing software. • Most processing software should allow importing of XML files.
– Extended Output • Statistical analysis
Submitting to OPUS
.
OPTIONS
I will also get the extended report to look at base coordinates and check against NGS values.
Is Planning Needed
OPUS-S REPORT
Reading the Report
File: Name of the RINEX file you submitted. Software: What version of software was used for processing.
Reading the Report
Ephemeris: Should always be rapid or precise for best results. Antenna Name: Verify Correct ARP Height: What you measured in the field, in meters
Reading the Report
Ephemeris: Should always be rapid or precise for best results.
Reading the Report
Observations used > 90% Fixed Ambiguities > 50%, Static Overall RMS < 3 cm. Typical
Observations used > 90% Fixed Ambiguities > 90% Static Overall RMS < 0.015 m High End
Reading the Report
Peak to Peak errors < 5 cm Ortho HGT: Ground elevation of the point and shows which Geoid model was applied. Geoid12B is the new default for OPUS IGS08 – International GNSS Service
Reading the Report
Peak to Peak errors < 5 cm
Reading the Report
State plane coordinates are given in the zone indicated and note the units are in meters and NAD 83 (2011) (EPOCH:2010.0000)
Reading the Report
List of the base stations that were used, the nearest published control point, and the OPUS disclaimer of accuracy for the point.
Extended Report
Base station components and absolute values.
Extended Report (cont.)
Base station components and absolute values.
Extended Report (cont.)
Base station components and absolute values.
Extended Report (cont.)
Base Line computations from my occupation to existing CORS stations..
Extended Report (cont.)
Statistical analysis from my occupation to existing CORS stations.
Extended Report (cont.)
Covariance matrix – Network accuracy.
Extended Report (cont.)
Position, Velocity and Vector Component to my occupation. Extended report also returns position in U.S. Survey feet.
Extended Report (cont.)
New Reference frames will be Geometric and Geopotential. NGS hopes to have this completed in 2022.
NGS YOU GOTTA LOVE THESE GUYS.
Reading the Report OPUS – RS
File: Name of the file you submitted. Software: What version of software was used for processing.
Reading the Report
Ephemeris: Should always be rapid or precise for best results. Antenna Name: Verify correct. ARP Height: What you measured in the field. True Vertical.
Reading the Report
Quality Ind: Are given for the beginning and ending of a data set. For these numbers higher is better and should never be less than one preferably not less than three. First number is the network mode adjustment and the second number rover mode adjustment.
Reading the Report
Normalized RMS: This number should be less than one which indicates less noise in the solution than expected. Lower the better.
Reading the Report
Ortho HGT: Ground elevation of the point and shows which Geoid model was applied. Geoid12B is the new default for OPUS.
Reading the Report
State plane coordinates are given in the zone indicated and note the units are in meters.
Reading the Report
List of the base stations that were used, the nearest published control point, and the OPUS disclaimer of accuracy for the point.
OPUS-RS Warnings
Why is this happening? Does this make you feel comfortable?
OPUS-RS Warnings (cont.)
Now I see the problem. Is my solution any good!!!!
www.kycors.ky.gov
KYCORS vs. National CORS Note: KYCORS stations in blue are not part of the National CORS. KYCORS stations in green are part of the National CORS. What does this mean?
OPUS-RS Warnings (cont.)
Have you seen this warning? Is our solution any good? What does this mean? To the best of my knowledge each state had two choices – process their own networks and supply this data to NGS – second option send raw observables to NGS and they would process the data and assign coordinates to the base stations.
OPUS-RS Warnings (cont.)
What can we do to evaluate and remove this warning. Review extended report look at CORS station published coordinates and compare these to NGS CORS station data sheets.
We could use the include – exclude option inside OPUS.
Review Questions • • • • •
What is OPUS? Who operates OPUS? What type of files can I submit to OPUS? What ephemeris file should be used? Which height should I use?
NGS Data Sheets NAD 83 (2011) EPOCH 2010
NGS Data Sheets NAD 83 (2011) EPOCH 2010
National Spatial Accuracy Standards
National Spatial Accuracy Standards
National Spatial Accuracy Standards OPUS Static Results
National Spatial Accuracy Standards OPUS Rapid Static Results
National Spatial Accuracy Standards OPUS Static Results vs. Known Control
National Spatial Accuracy Standards OPUS Rapid Static Results vs. Known Control
National Spatial Accuracy Standards Network Solution Comparison
National Spatial Accuracy Standards Network Solution Comparison vs. Known Control
Questions
Contact Information: Jeff Clark, PLS – Jeff_clark@yourprecision. com – 270-559-9097
Taking Advantage of OPUS Agenda • What is OPUS ? – Who operates the system ? – What does it do ?
• Processing Software – Static – Rapid Static – Kinematic not yet available
Taking Advantage of OPUS Agenda • How do I submit my data? – E-mail address, Data File, Antenna Type, Antenna Height, and Options
• How do I interpret the results? – Ephemeris used, observations used, fixed ambiguities, overall RMS
• Review Questions
What is OPUS ? • Online Positioning User Service – System is operated by National Geodetic Survey. – Processes your GPS data files. Glonass or Galileo observables may be included; though only the GPS are used. – Utilizes the same models and tools used to manage the National CORS Network.
Processing Software • Static – Data files must contain at least 2 hours but not more than 48 hours, but not crossing UTC midnight more than once. – PAGES Software
– Coordinates are averaged from three independent single-baseline solutions.
Processing Software • Rapid Static – Data files must contain at least 15 minutes but not more than 2 hours. Data files must include the P2 and either P1 or C1 observables. – RSGPS Software • Employs more aggressive algorithms. • More stringent data continuity and geometry requirements. • Will NOT work in many remote areas of the country.
www.ngs.noaa.gov/OPUS OPUS: Online Positioning User Service
Submitting to OPUS • Choose Observation File • Choose Your Antenna Type • Enter Antenna Height & e-mail address
Submitting to OPUS • Data File – Data file can be in any GPS observable format which has been converted to RINEX. – Files can also be compressed, including multiple files in a single zip archive. – Files can be collected at Epoch rates of 1,2,3,5,10,15 or 30 seconds, however all will be decimated to 30 seconds for processing.
Submitting to OPUS • Antenna Type – Must be correct. NGS uses absolute antenna calibrations.
Submitting to OPUS • Antenna Height – Measured in meters. – Measured to the bottom of antenna mount. Vertical measurement, no slant heights.
Submitting to OPUS • Options – Allow customization of the processing and reporting. – Selections override OPUS defaults. – Should only be employed by experienced users.
Submitting to OPUS • Options – Select State Plane Coordinate Zone
– Draft XML Output • Can be utilized with processing software. • Most processing software should allow importing of XML files.
– Extended Output • Statistical analysis
Submitting to OPUS
.
OPTIONS
I will also get the extended report to look at base coordinates and check against NGS values.
Is Planning Needed
OPUS-S REPORT
Reading the Report
File: Name of the RINEX file you submitted. Software: What version of software was used for processing.
Reading the Report
Ephemeris: Should always be rapid or precise for best results. Antenna Name: Verify Correct ARP Height: What you measured in the field, in meters
Reading the Report
Ephemeris: Should always be rapid or precise for best results.
Reading the Report
Observations used > 90% Fixed Ambiguities > 50%, Static Overall RMS < 3 cm. Typical
Observations used > 90% Fixed Ambiguities > 90% Static Overall RMS < 0.015 m High End
Reading the Report
Peak to Peak errors < 5 cm Ortho HGT: Ground elevation of the point and shows which Geoid model was applied. Geoid12B is the new default for OPUS IGS08 – International GNSS Service
Reading the Report
Peak to Peak errors < 5 cm
Reading the Report
State plane coordinates are given in the zone indicated and note the units are in meters and NAD 83 (2011) (EPOCH:2010.0000)
Reading the Report
List of the base stations that were used, the nearest published control point, and the OPUS disclaimer of accuracy for the point.
Extended Report
Base station components and absolute values.
Extended Report (cont.)
Base station components and absolute values.
Extended Report (cont.)
Base station components and absolute values.
Extended Report (cont.)
Base Line computations from my occupation to existing CORS stations..
Extended Report (cont.)
Statistical analysis from my occupation to existing CORS stations.
Extended Report (cont.)
Covariance matrix – Network accuracy.
Extended Report (cont.)
Position, Velocity and Vector Component to my occupation. Extended report also returns position in U.S. Survey feet.
Extended Report (cont.)
New Reference frames will be Geometric and Geopotential. NGS hopes to have this completed in 2022.
NGS YOU GOTTA LOVE THESE GUYS.
Reading the Report OPUS – RS
File: Name of the file you submitted. Software: What version of software was used for processing.
Reading the Report
Ephemeris: Should always be rapid or precise for best results. Antenna Name: Verify correct. ARP Height: What you measured in the field. True Vertical.
Reading the Report
Quality Ind: Are given for the beginning and ending of a data set. For these numbers higher is better and should never be less than one preferably not less than three. First number is the network mode adjustment and the second number rover mode adjustment.
Reading the Report
Normalized RMS: This number should be less than one which indicates less noise in the solution than expected. Lower the better.
Reading the Report
Ortho HGT: Ground elevation of the point and shows which Geoid model was applied. Geoid12B is the new default for OPUS.
Reading the Report
State plane coordinates are given in the zone indicated and note the units are in meters.
Reading the Report
List of the base stations that were used, the nearest published control point, and the OPUS disclaimer of accuracy for the point.
OPUS-RS Warnings
Why is this happening? Does this make you feel comfortable?
OPUS-RS Warnings (cont.)
Now I see the problem. Is my solution any good!!!!
www.kycors.ky.gov
KYCORS vs. National CORS Note: KYCORS stations in blue are not part of the National CORS. KYCORS stations in green are part of the National CORS. What does this mean?
OPUS-RS Warnings (cont.)
Have you seen this warning? Is our solution any good? What does this mean? To the best of my knowledge each state had two choices – process their own networks and supply this data to NGS – second option send raw observables to NGS and they would process the data and assign coordinates to the base stations.
OPUS-RS Warnings (cont.)
What can we do to evaluate and remove this warning. Review extended report look at CORS station published coordinates and compare these to NGS CORS station data sheets.
We could use the include – exclude option inside OPUS.
Review Questions • • • • •
What is OPUS? Who operates OPUS? What type of files can I submit to OPUS? What ephemeris file should be used? Which height should I use?
NGS Data Sheets NAD 83 (2011) EPOCH 2010
NGS Data Sheets NAD 83 (2011) EPOCH 2010
National Spatial Accuracy Standards
National Spatial Accuracy Standards
National Spatial Accuracy Standards OPUS Static Results
National Spatial Accuracy Standards OPUS Rapid Static Results
National Spatial Accuracy Standards OPUS Static Results vs. Known Control
National Spatial Accuracy Standards OPUS Rapid Static Results vs. Known Control
National Spatial Accuracy Standards Network Solution Comparison
National Spatial Accuracy Standards Network Solution Comparison vs. Known Control
Questions
Contact Information: Jeff Clark, PLS – Jeff_clark@yourprecision. com – 270-559-9097
