NGS Geodetic Tools and Education Services Marti Ikehara: California Geodetic Advisor 916-227-7325

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Presentation transcript:

NGS Geodetic Tools and Education Services Marti Ikehara: California Geodetic Advisor

Topics 1.CORS/CGPS in CA 2. Geoid12A 3.Datum Tags/Epochs 4.New Datasheet format 5.Advisor Program 6.Educational tools/services Demonstrations: VDATUM, v3.1 ( , ) DSWorld

As Of 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 2 nd quarter, 2012 PBO Time Series Website Awesome /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, Transforms CORSPassive (CA)Multiple Epochs ITRF NAD83 (1998) , ITRF [NAD83 (2007) —E] NAD83 (CORS96) NAD83 (2007) IGS NAD83 (2011) 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 th 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) as constraints in adjustment, Utilize HTDP to translates to epoch desired, Produce NAD83(2011) 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 index.shtml FIRST: Tools, Update program Enhancement enables you to distinguish VERTCON NAVD88 from other(control) NAVD88

5/24/201516

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 longitude Improvements: Do not need to select geographic model region More streamlined interface for user Horizontal/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…Retiring  Fewer cooperative partners (states) can justify the financial agreement  Recommendation from some many years ago was for Fedgov to fully fund Advisor program  Advisors to be located at NOAA or Fed office

The Changing Face of the Geodetic Advisor Program, Geography  Provide equal service to non-coop states  REGIONALIZATION  15 advisors total for 50 states, PR, Pacific islands  Regions being discussed in NGS Advisory Group is Chair (SAB Chief)  Situated in a city with decent airport!  Proposal includes “State Coordinator” as POC  Transition in next 4 years, with attrition

Science & Education, Presentations Library downloadable, sortable/searchable

Height Modernization Program monthly meetings, presentations

NGS Training Center