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Activities at the National Geodetic Survey

Activities at the National Geodetic Survey. Dan Roman Spatial Reference Systems Division and Steve Hilla Geosciences Research Division. NGS’ Mission.

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Activities at the National Geodetic Survey

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  1. Activities at the National Geodetic Survey Dan Roman Spatial Reference Systems Division and Steve Hilla Geosciences Research Division

  2. NGS’ Mission To define, maintain and provide access to the National Spatial Reference System (NSRS) to meet our Nation’s economic, social, and environmental needs. ……………………………………………......................... The NSRSis a consistent coordinate system that defines latitude, longitude, height, scale, gravity, orientation, and shoreline throughout the United States.

  3. Divisions within NGS • Geodetic Services Division • Spatial Reference Systems Division • Remote Sensing Division • Observations and Analysis Division • Systems Development Division • Geosciences Research Division

  4. New Geometric Datum

  5. Why We’re Changing • More consistency in reference frames • Progression of WGS-84 models towards ITRF • Minimize impact of datum errors • Standardizes coordinates for RTN applications h83 h08 Earth’s Surface ITRF 08 Origin 2.2 meters NAD 83 Origin

  6. Next Steps • Define the new datum • Likely based on an IGS model • Foundation CORS to build IGS solution • Repro2/Repro3 to update historical CORS • CORS site coordinates with velocities • OPUS-Projects type tool to develop positions • Constrained OP procedures to vet for NSRS-DB • OSU vs. OSU studies to update NOS/NGS 58/59

  7. Future Application Simplified Utility Dynamic Utility Accounts for movement of CORS and rover site More suitable for real time applications More consistent with solutions in other frames (IGS and WGS-84) Mitigates potential errors from erroneous datum choice • OP solutions reduced to a standard epoch (2022.0) • Use given velocity models inherent in new datum • Established at CORS sites • May discontinue HTDP for values between sites • Coordinates (2022.0) then use State Plane projections

  8. New GEOPOTENTIAL Datum

  9. Approximate extent of 2022 geoid model used for the “North American” part of the new geopotential reference frame. Satellite+Airborne+Surface

  10. Application • Primarily GNSS/geoid ht • Nationally consistent • Local leveling control • Tie-in with IGLD2020 • Tie-in with local MSL & MODT/Storm Surge • Regional model • North America • Central America • Caribbean • Validation lines • GSVS 11 & 14 complete • Data collected • Gravity • GPS & leveling • Astrogeodetic DoV's • Airborne LIDAR survey • Planning underway for GSVS16 (17)

  11. BENCH MARK CONTROL

  12. Consistency with GNSS/geoid Geometric Coordinates Geopotential Coordinates Checking with Canada to see how they did this Easy approach: use GPSBM intersection of data 500,000 level BM 80,000 GPS BM Only 26,000 GPSBM More rigorous: use original height differences & adjust • Likely follows some type of National Adjustment • Instead of converting from IGS to NAD 83 – stays as IGS • Easy approach: use same vectors as before • More rigorous: use original observations

  13. Activities within the Geosciences Research Division • GNSS Software R & D • Adding new models to the GPS orbit/baseline software • Development of OPUS-Projects and Multi-year tools • Development of tools to monitor CORS data • Extending the software to include other constellations • Gravity Field Research • Combining Satellite, Airborne, and Terrestrial Gravity + DEMs to improve Gravity Field Modeling • Developing Hybrid- and Scientific-Geoid Models • Investigating subsurface density variability

  14. Activities within the Geosciences Research Division • Antenna Calibrations • Extensive antenna metadata (photos, diagrams, etc.) at http://www.ngs.noaa.gov/ANTCAL • NGS does both relative and absolute calibrations • also aircraft antennas and integrated receiver/antennas • Ionospheric Studies using both Models and Observed Data • phase/range data to compute 2nd- and 3rd-order effects • Use of IONEX files (available from mid-1998 to present) • Use of the IRI-2012 model for data from 1994 to 1999

  15. BigAnt (Richmond, Florida)

  16. http://www.ngs.noaa.gov/web/science_edu/presentations_archive/files/igs2014poster_bigant_v2a.pdfhttp://www.ngs.noaa.gov/web/science_edu/presentations_archive/files/igs2014poster_bigant_v2a.pdf

  17. * Antenna Calibrations - We have an extensive antenna metadata collection (descriptions, photos, diagrams) available through the geodesy.noaa.gov/ANTCAL website - NGS continues to operate the relative calibration system with capability for N,E,U antenna offsets to the antenna phase centers plus 1D phase center variations (wrt elevation only) for GPS frequencies - NGS will soon re-institute absolute calibration using a pan/tilt motor to calibrate geodetic antennas. This system determines the N,E,U antenna offsets as well as 2D Phase Center Variations (wrt to both elevation and azimuth). Future development will expand operations to full GNSS. - In addition to contributing to the IGS ANTEX file, NGS also calibrates smaller aircraft antennae, and the integrated receiver/antenna equipment used by surveyors. paper? http://www.ngs.noaa.gov/web/science_edu/presentations_archive/files/igs2014poster_bigant_v2a.pdf On Thu, Apr 2, 201 Activities within the Geosciences Research Division • GRAV-D Support • Investigation of Airborne Gravimetry errors • Field collection, data processing, instrument mods • Research into PPP and Differential accuracy (GPS+IMU) • Pattern & magnitude of gravity changes over decades • Terrestrial and Airborne data management & analysis • Support for IERS Site Surveys • Assist field crews to tie together VLBI,SLR,DORIS,GNSS • Generate/check SINEX files sent to IERS for future ITRFs

  18. GRAV-D Current Coverage As of Jan 2015: 40.4% of country covered Key: Green: Available dataBlue: Data In processingOrange: Being collectedWhite: Planned http://www.ngs.noaa.gov/GRAV-D/data_products.shtml

  19. * Antenna Calibrations - We have an extensive antenna metadata collection (descriptions, photos, diagrams) available through the geodesy.noaa.gov/ANTCAL website - NGS continues to operate the relative calibration system with capability for N,E,U antenna offsets to the antenna phase centers plus 1D phase center variations (wrt elevation only) for GPS frequencies - NGS will soon re-institute absolute calibration using a pan/tilt motor to calibrate geodetic antennas. This system determines the N,E,U antenna offsets as well as 2D Phase Center Variations (wrt to both elevation and azimuth). Future development will expand operations to full GNSS. - In addition to contributing to the IGS ANTEX file, NGS also calibrates smaller aircraft antennae, and the integrated receiver/antenna equipment used by surveyors. Activities within the Geosciences Research Division • Research into monitoring wetlands and rising sea levels • Comparing technologies and methods for surveying in difficult coastal environments. • Research into installation of geospatial infrastructure for monitoring change over time. • Education and Outreach • Development of online learning modules and videos related to geodesy, datums, gravity, coastal zones, etc. • Training/mentoring of undergraduate and graduate students in surveying, geodesy, geosciences, computer science, engineering, and other majors.

  20. * Antenna Calibrations - We have an extensive antenna metadata collection (descriptions, photos, diagrams) available through the geodesy.noaa.gov/ANTCAL website - NGS continues to operate the relative calibration system with capability for N,E,U antenna offsets to the antenna phase centers plus 1D phase center variations (wrt elevation only) for GPS frequencies - NGS will soon re-institute absolute calibration using a pan/tilt motor to calibrate geodetic antennas. This system determines the N,E,U antenna offsets as well as 2D Phase Center Variations (wrt to both elevation and azimuth). Future development will expand operations to full GNSS. - In addition to contributing to the IGS ANTEX file, NGS also calibrates smaller aircraft antennae, and the integrated receiver/antenna equipment used by surveyors. Upcoming openings in SRSD and GRD • Senior GNSS researcher (Phd level) in Silver Spring, MD. • Senior GNSS researcher (Phd level) in Boulder, Colorado • Recent Graduate program, GNSS researcher (BS/MS level) in Silver Spring Maryland. • Recent Graduate program, Gravity Analyst (BS/MS level) in Silver Spring Maryland. • RTN Liaison (Senior Geodesist) in Silver Spring – currently advertising at USAJOBS and closed April 7 • Geodesist (Real Time Kinematic Network), ZP-1372-4 (DE/CR) • Geodesist, (Real Time Kinematic Network) ZP-1372-4 (MAP) • Recent Graduate program, OPUS Analyst (BS/MS level) in Silver Spring Maryland – two positions.

  21. For more details on NGS Activities the NGS 101 Slidedeck in the NGS Presentation Library Daniel R. Roman, Chief, Spatial Reference Systems Divisions dan.roman@noaa.gov 301-713-3200 Steve Hilla, Geodesist, Geosciences Research Division steve.hilla@noaa.gov 301-713-2851

  22. Questions ?

  23. GRAV-D Expected Coverage Puerto Rico US Virgin Is. • Continental United States • Alaska • Aleutian Islands • Puerto Rico/US Virgin Islands • Hawaii and Pacific Islands (Guam, American Samoa)

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