NGS Geodetic Tools and Education Services

Marti Ikehara: marti.ikehara@noaa.govCalifornia Geodetic Advisor

916-227-7325www.ngs.noaa.gov

Topics1.CORS/CGPS in CA2. Geoid12A3.Datum Tags/Epochs4.New Datasheet format5.Advisor Program6.Educational tools/services

Demonstrations:VDATUM, v3.1 (-122 12.2, 373737)DSWorld

AsOf6/6/12

New CORS in CA•CSRC requested about 130 of the CRTN backbone sites to become NGS CORS; some already were•Essentially all but a handful were added to NGS CORS network in 2nd quarter, 2012

PBO Time Series Website Awesomehttp://pbo.unavco.org/data/gps/plotviewer/P334/GPS

GEOID12A Development• Model is BASED on ellipsoid heights published from

NA2011 project• Proposed stations, different than for GEOID09, for

inclusion/exclusion were distributed to geodetic advisors for review & acceptance/rejection; eg, because location in subsidence area

• OPUS-DB results are included• To improve future geoid modeling– Collect GPS data on leveled BMs which are likely to have

been stable since they were leveled (1988)

GEOID12A Error Grid

DRAFT, mid-Jan

2013

NGS Datum Tags/Epoch Dates, TransformsCORS Passive (CA) Multiple Epochs

ITRF00 1997.00 NAD83 (1998) 1998.50 2000.35, 2004.50

ITRF00 2002.00 [NAD83 (2007) 2002.00—E]

NAD83 (CORS96) 2002.00 NAD83 (2007) 2007.00

IGS08 2010.00

NAD83 (2011) 2010.00 NAD83 (2011) 2010.00

Transforms in development, mostly for batch files for mapping purposes (GIS):NAD83 (2011) to NAD83 (2007)NAD83 (2007) to most recent significant adjustment (98)NAD83 (1998) to NAD83 (1992)*

HTDP, currently v. 3.2.3

• 4th option: Interactively transform positions between reference frames and/or dates.

• Epoch date format now includes deci-year• All NAD83 realizations are treated the same• Datum tag/epoch usage Start with NAD83(2011) 2010.00 as constraints in adjustment,Utilize HTDP to translates to epoch desired,Produce NAD83(2011) 2004.50 coordinates, for example

12 cm

DSWorld: mapping tool and more• Need to have Google Earth installed• Tools, Download PC Software, USER-CONTRI-

BUTED SOFTWARE, DSWorld• http://www.ngs.noaa.gov/PC_PROD/PARTNERS/

index.shtml

• FIRST: Tools, Update program • Enhancement enables you to distinguish VERTCON

NAVD88 from other(control) NAVD88

04/22/23 16

Datums available in VDATUM

VDATUM tips• Must choose Height rather than Sounding• Must choose Ht for Source AND Target• Longitude shown before latitude• Must use – for longitudeImprovements:Do not need to select geographic model regionMore streamlined interface for userHorizontal/geometric transformations also

The Changing Face of the Geodetic Advisor Program

What are we not? Geodentists…•How is it changing? We are…Baby boomers! Aging…RetiringFewer cooperative partners (states)can justify the financial agreementRecommendation from some many years ago was for Fedgov to fully fund Advisor programAdvisors to be located at NOAA or Fed office

The Changing Face of the Geodetic Advisor Program, Geography

Provide equal service to non-coop statesREGIONALIZATION15 advisors total for 50 states, PR, Pacific islandsRegions being discussed in NGS Advisory GroupRoss.Mackay@noaa.gov is Chair (SAB Chief)Situated in a city with decent airport!Proposal includes “State Coordinator” as POCTransition in next 4 years, with attrition

Science & Education, Presentations Librarydownloadable, sortable/searchable

Height Modernization Programmonthly meetings, presentations

NGS Training Center

Marti.ikehara@noaa.gov