Adjustments to the National Spatial Reference System Future

Adjustments to the National Spatial Reference System Future of the NSRS Mississippi Department of Transportation August 20, 2012 Renee Shields Height Modernization Manager

NGS Mission Statement To define, maintain and provide access to the National Spatial Reference System (NSRS) to meet our nation’s economic, social, and environmental needs.

National Spatial Reference System • The official national coordinate system of the U. S. federal government which includes: – Geodetic latitude, longitude and height – Scale, gravity, and orientation – How these values change with time • Components include: – CORS – Network of passive monuments – Official national shoreline – Precise orbits of GNSS satellites used to define NSRS – Models and tools to describe how all of these quantities change over time.

From the NGS 10 -Year Plan • Define the NSRS – “The NSRS must be more accurate than all activities which build upon it, while still being practicably achievable. ” • Maintain the NSRS – “NGS must track all of the temporal changes to the defining points of the NSRS in such a way as to always maintain the accuracy in the NSRS definition. ” • Provide Access to the NSRS – “NGS must develop and maintain guidelines for users to access the NSRS at a variety of accuracies. ” – “NGS will publish all coordinates of defining points of the NSRS with an epoch tag and will furthermore publish velocities relative to that epoch-tagged set of coordinates” http: //geodesy. noaa. gov/INFO/ngs_tenyearplan. pdf

The National Geodetic Survey 10 year Plan • Main goal - replace NAD 83 and NAVD 88 • Revisit/re-evaluate periodically – GRAV-D underway, but funding support less than anticipated, so adjust completion date – Incorporate strategic planning and project management techniques, language – The previous plan = big ideas without clearly explaining how to get there, and seemed to presume NGS had unlimited staff resources. – Failed to include day to day mission operations that consume as much as 90% of staff time and resources http: //www. ngs. noaa. gov/INFO/NGS 10 yearplan. pdf

10 Year Plan Update • Target release date: January 30 th, 2013 • Public review period: July 30 th – August 30 th • Four strategic goals and one enterprise goal – Support the users of the NSRS – Modernize and improve the NSRS – Expand the NSRS stakeholder base through partnerships, education, and outreach – Develop and enable a workforce with a supportive environment – Enterprise: Improve organizational and administrative functionality

New Datum Managers Joe Evjen Geometric Datum Project Manager 301 -713 -3194, x 109 Joe. evjen@noaa. gov Mark Eckl Geopotential Datum Project Manager 301 -713 -3215, x 117 Mark. eckl@noaa. gov

Focus Areas within NGS • Infrastructure • Models and Tools • Outside Capacity Building

Infrastructure • Quality check data that is incorporated in the NGS database • OPUS DB and Projects change how NGS accepts geodetic control into the NSRS • Encourage use of active control over passive control, especially in dynamic areas • Enable access to new datum through precise leveling when subcm relative heights needed

Infrastructure • Enable positioning consistent with NSRS – e. g. Real Time Networks • Improve “timeliness” of coordinates on datasheets • Re-observe/Readjust – special case projects, gravity • Model motion, develop tools – monitor with CORS, satellite gravity • Metadata: Epochs, reliability scale, i. e. “Expiration date” on coordinates

Old Datasheet

New Datasheet 1 National Geodetic Survey, Retrieval Date = AUGUST 16, 2012 DJ 8579 ************************************ DJ 8579 HT_MOD - This is a Height Modernization Survey Station. DJ 8579 DESIGNATION - 40+00 DJ 8579 PID - DJ 8579 STATE/COUNTY- MS/YALOBUSHA DJ 8579 COUNTRY - US DJ 8579 USGS QUAD - COURTLAND (1983) DJ 8579 Move ell ht and epoch info into top box, add DJ 8579 *CURRENT SURVEY CONTROL datum tags DJ 8579 ___________________________________ DJ 8579* NAD 83(2011) POSITION- 34 09 03. 57104(N) 089 54 20. 86192(W) ADJUSTED DJ 8579* NAD 83(2011) ELLIP HT 62. 697 (meters) (06/27/12) ADJUSTED DJ 8579* NAD 83(2011) EPOCH - 2010. 00 DJ 8579* NAVD 88 ORTHO HEIGHT 89. 10 (meters) 292. 3 (feet) GPS OBS DJ 8579 ___________________________________ DJ 8579 NAVD 88 orthometric height was determined with geoid model GEOID 03 DJ 8579 GEOID HEIGHT -26. 37 (meters) GEOID 03 DJ 8579 GEOID HEIGHT -26. 36 (meters) GEOID 12 DJ 8579 NAD 83(2011) X 8, 687. 763 (meters) COMP DJ 8579 NAD 83(2011) Y - -5, 283, 919. 098 (meters) COMP Ht computed with Note when GPS Ortho DJ 8579 NAD 83(2011) Z - 3, 560, 354. 617 (meters) COMP and provide that previous geoid model, DJ 8579 LAPLACE CORR -0. 62 (seconds) DEFLEC 09 model ht DJ 8579 http: //www. ngs. noaa. gov/web/news/Datasheet_Format_Change. shtml

DJ 8579 FGDC Geospatial Positioning Accuracy Standards (95% confidence, cm) DJ 8579 Type Horiz Ellip Dist(km) DJ 8579 ---------------------------------DJ 8579 NETWORK 0. 41 0. 71 DJ 8579 ----------------------------------Better way to quantify DJ 8579 MEDIAN LOCAL ACCURACY AND DIST (016 points) 0. 51 0. 74 37. 87 accuracies DJ 8579 ---------------------------------DJ 8579 NOTE: Click here for information on individual local accuracy DJ 8579 values and other accuracy information. DJ 8579 Local accuracies on DJ 8579. The horizontal coordinates were established by GPS observations request DJ 8579. and adjusted by the National Geodetic Survey in June 2012. DJ 8579. NAD 83(2011) refers to NAD 83 coordinates where the reference DJ 8579. frame has been affixed to the stable North American tectonic plate. See DJ 8579. www. ngs. noaa. gov/web/surveys/NA 2011 for more information. DJ 8579. The horizontal coordinates are valid at the epoch date displayed above DJ 8579. which is a decimal equivalence of Year/Month/Day. DJ 8579. The orthometric height was determined by GPS observations and a DJ 8579. high-resolution geoid model using precise GPS observation and DJ 8579. processing techniques. DJ 8579

National Geodetic Survey, Retrieval Date = AUGUST 19, 2012 DJ 8579 ********************************** DJ 8579 ACCURACIES - Complete network and local accuracy information. DJ 8579 HT_MOD - This is a Height Modernization Survey Station. DJ 8579 DESIGNATION - 40+00 DJ 8579 PID - DJ 8579 Statistical Information, in cm, for point DJ 8579 follows. DJ 8579 Note that Horz and Ellip values are the official 95% DJ 8579 FGDC accuracy standards. The values of Std. N, Std. E and Stdh are the DJ 8579 standard deviations (one sigma) of the coordinates (NETWORK) or DJ 8579 of the difference in the coordinates (LOCAL) in Latitude, Longitude DJ 8579 and Ellipsoid Height. The value Corr. NE is the correlation DJ 8579 coefficient between the latitude and longitude components of either DJ 8579 the coordinate (NETWORK) or coordinate difference (LOCAL). DJ 8579 Type/PID Horz Ellip Dist(km) Std. N Std. E Stdh Corr. NE DJ 8579 ---------------------------------DJ 8579 NETWORK 0. 41 0. 71 0. 00 0. 18 0. 15 0. 36 -0. 03351392 DJ 8579 ---------------------------------DJ 8579 LOCAL: DJ 8579 DJ 8605 0. 80 0. 45 3. 83 0. 32 0. 23 +0. 01508681 DJ 8579 DJ 8606 0. 74 0. 49 4. 17 0. 33 0. 27 0. 25 +0. 12974978 DJ 8579 DJ 8607 1. 46 0. 86 8. 17 0. 61 0. 58 0. 44 +0. 08505534 DJ 8579 AJ 7796 0. 42 0. 73 22. 17 0. 19 0. 15 0. 37 +0. 03075219 DJ 8579 CG 3895 0. 49 0. 82 30. 15 0. 22 0. 18 0. 42 +0. 07967025 DJ 8579 EH 3091 0. 46 0. 76 36. 49 0. 20 0. 17 0. 39 -0. 03318633 DJ 8579 DJ 1445 0. 51 0. 78 36. 70 0. 22 0. 20 0. 40 -0. 05498833 DJ 8579 DJ 8578 0. 55 0. 80 37. 68 0. 24 0. 21 0. 41 -0. 06819426 DJ 8579 EH 2740 0. 51 0. 86 38. 06 0. 22 0. 20 0. 44 -0. 01962507 DJ 8579 DF 7963 0. 42 0. 71 40. 44 0. 19 0. 15 0. 36 +0. 02929858

Changes to NGS Datasheet • • • • • • • 1 National Geodetic Survey, Retrieval Date = AUGUST 16, 2012 AB 3306 ************************************ AB 3306 FBN - This is a Federal Base Network Control Station. AB 3306 DESIGNATION - MOBILE POINT AB 3306 PID - AB 3306 STATE/COUNTY- AL/BALDWIN AB 3306 COUNTRY - US AB 3306 USGS QUAD - FORT MORGAN (1982) AB 3306 *CURRENT SURVEY CONTROL AB 3306 ___________________________________ AB 3306* NAD 83(2011) POSITION- 30 13 36. 45583(N) 088 01 21. 76600(W) ADJUSTED AB 3306* NAD 83(2011) ELLIP HT-24. 343 (meters) (06/27/12) ADJUSTED AB 3306* NAD 83(2011) EPOCH - 2010. 00 AB 3306* NAVD 88 ORTHO HEIGHT **(meters) **(feet) NOT PUB AB 3306 **This station is located in a suspected subsidence area (see below). AB 3306 ___________________________________ AB 3306. . . AB 3306 AB 3306 ** ** ** This station is in an area of known vertical motion. If no orthometric height is shown in the current survey control section, all orthometric heights are considered suspect and are only available in the superseded section if suspect heights were requested.

Models/Tools • Models • Geoid: 1 -cm; GRAV-D; strategy for monitoring • HTDP: Partner with Scripps, UAF • VTDP: Repeat surveys in Gulf Coast, subsidence monitoring in Harris-Galveston Coastal Subsidence District • Tools • Online Geodetic tool kit • LOCUS • OPUS S, RS, DB, Projects • Transformations: Vdatum, new transformation: HARN to 2007 to 2011

Outreach and Outside Capacity Building Leveling – Spokane, 2006 • State Geodetic Advisor Program • Forums, workshops • Conferences • Training, capacity building www. ngs. noaa. gov/corbin/index. shtml

NGS Height Modernization Web Site

Questions Renee Shields Height Modernization Manager 301 -713 -3231, x 116 Renee. Shields@noaa. gov www. ngs. noaa. gov/heightmod