Latest Developments in NGSNGS Products, Tools and Services

Pamela FromhertzColorado State Geodetic Advisor

National Geodetic SurveyNational Oceanic and Atmospheric Administration

PLSC Annual Survey Summit March 1, 2013PLSC Annual Survey Summit March 1, 2013

National Geodetic Survey Advisor Program

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

National Geodetic Survey Mission

• Latitude• Longitude• Height• Scale• Gravity• Orientation• Time Variations

Technology is Driving the Changes You See!

Since Last Years Conference1. Multi-Year CORS solution – 2011 - Completed

2. NAD 83 (2011) epoch 2010.0 - Completed

3. Geoid 12A -Completed

4. New Data Sheets – 2012 –Completed

5. National Adjustment (vertical) of GPS passive marks– Under consideration; This not adjusting the leveling network

– Constrain vertically to NAVD 88 benchmarks

– GNSS-derived orthometric heights

6. Adoption of new datums -– Geometric, could happen any time

– Vertical, requires completion of GRAV-D

Agenda• Datums• Improvements in the NSRS• NAD83 (2011) epoch 2010.0 Readjustment• Geoid12A/New Datums/GRAV-D/Heights• DS-World/DataSheets/Mark Recovery• CORS/OPUS • RTN• CBLs

CHANGESADVANCEMENTSIMPROVEMENTS

Retirements

• Dave Doyle, Chief Surveyor• Ronnie Taylor, Deputy Director, former FL Advisor• Gilbert Mitchell, Chief Geodetic Services Division• Renee Shields, HT MOD Program Manager• Curt Smith, MT/ID Advisor• Dave Minkel, AZ Advisor• Davey Crockett, Leveling Processing guru• Monroe Rivers, KS Advisor• ….

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Geodetic Reference Surfaces

A beachball globe

Mathematical best fit to Earth’s surface…

Modeled best fit to “sea surface”

equipotential gravity field

used for defining Latitude and Longitude

used for defining Elevation

A mathematical and geometric concept that serves as a foundation or starting point for mapping, surveying, engineering based on realization of actual geospatial data points.

Datums

Geodetic Datums

Horizontal 2-D (Latitude and Longitude) (e.g. NAD 27, NAD 83 (1986))

Vertical/Geopotential 1-D (Orthometric Height) (e.g. NGVD 29, NAVD 88, Local Tidal)

Geometric3-D (Latitude, Longitude and Ellipsoid Height)

Fixed and Stable(?) - Coordinates seldom change (e.g. NAD 83 (1993), NAD 83 (2007))

also

4-D (Latitude, Longitude, Ellipsoid Height, Velocities) Coordinates change with time (e.g. NAD 83, ITRF00, ITRF05)

TIME NETWORK LOCALNETWORK SPAN ACCURACY ACCURACY . NAD 27 1927-1986 10 meter s (1 part in 100,000)

NAD83(86) 1986-1990 1 meter (1 part in 100,000)

NAD83(199x)* 1990-2007 0.1 meter B-order (1 part in 1 million)HARN A-order (1 part in 10 million)

NAD83(NSRS2007) 2007 - 2011 0.01 meter 0.01 meter (CORS)NAD83(NSRS2011) 2011 - 0.01 meter 0.01 meter (CORS)

NGSNational Spatial Reference System(NSRS)

Improvements

* CO was completed and adjusted in 1992

Geodetic control (the NSRS) is the foundation for all geospatial products.

Without Geodetic Control as a “base map” layer, GIS applications will not work properly

Accurate positioning begins with accurate coordinates

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GPS Receiver Grades

• Recreational Grade– $100-$1000 1-10 meters

• Mapping– $2,000-$6,000 submeter - 3 meter

• Survey Grade– $10,000 + 5mm – 2 cm

2010 May 11 Federal Geospatial Summit 13

Same point different datum's = different lat/long’s

1000 m radius

500 m radius

Flagpole NAD83

COMET

Datum Differences NAD 27 – NAD 83

Datum Difference NGVD 29 – NAVD 88

Are NAD 83 & WGS 84

The Same?

Are NAD 83 & WGS 84 The Same?

Federal Register Notice: Vol. 60, No. 157, August 15, 1995, pg. 42146“Use of NAD 83/WGS 84 Datum Tag on Mapping Products”

NO but for your application is it significant?

If requirements are greater than 3m then Yes

If requirements are less than 3m then No

State Plane CoordinatesState plane coordinates are the

projection of latitudes and longitudes

eastings

northings

To a flat mapping surface that is usually defined by state law

Plane Coordinate Conversion Tools

State Plane CoordinatesGPPCGP (NAD 27 only)

SPCS83 (NAD 83 only)http://www.ngs.noaa.gov/TOOLS/spc.shtml

UTMUTMS (Both NAD 27 & NAD 83)http://www.ngs.noaa.gov/TOOLS/utm.shtml

BothCORPSCON (Both NAD 27 & NAD 83)http://crunch.tec.army.mil/software/corpscon/corpscon.html

www.ngs.noaa.gov

www.geodesy.noaa.gov

For instance:

What is the Source of the Data?What is the Datum/Adjustment Epoch?What are the Field Conditions?What Equipment was used, especially what Antenna?What firmware was in the receiver and collector?What redundancy, if any, was used?

Utah is now a U.S. Survey Foot State(Blue)

Legislation for NAD 83 and units

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NSRSNew Adjustment

2010 May 11 Federal Geospatial Summit 25

I. NGS Streams Raw Data From The Backbone CORS

II. Provide Outreach and Education

III. Develop and Publish Guidelines Describing Best Practices.

IV. Research Scientific Research Affecting Accurate Real-Time Positioning. [satellite orbits, refraction, multipath, antenna calibration, and crustal motion.]

NGS - RT Program Components

CSRN

• CSRN Board meetings– Thursday, April 18th, 2013, 5:30 to 7:00 pm. Location to be determined– Thursday, September 19th, 2013, 5:30 to 7:00 pm. LTBD

• CSRN Membership meeting– Thursday, November 21st, 2013, 5:30 to 7:00 pm.

LTBD, topic and speaker to be selected

• Events– Saturday, August 17th, 2013 – GPS Day. LTBD– Sometime in August or September – CSRN and Northern PLSC Chapters Picnic

– Theme, checking instrument calibration

CBLs• June 10 and June 17

– Workshop (How to)

– Re-Measure Highline

– Training for Pam

– Re-Measure Durango

– ??

• New CBL in Denver Metro Area

• Complete all other CBLs in 2014

Ohio CBLhttp://digital.bnpmedia.com/publication/?i=143556&p=25

Feb 2013 POB

CBLs

NGS Training Center

http://www.ngs.noaa.gov/corbin/

Webinars!

2010 May 11 Federal Geospatial Summit 34geod

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IMPROVEMENTS

More information…NGS Home Page: http://www.geodesy.noaa.gov

geodesy.noaa.govCORS Webpage: http://www.ngs.noaa.gov/CORS/

CORS newsletterOPUS Webpage: http://www.ngs.noaa.gov/OPUS/

Find Your Advisor:www.ngs.noaa.gov/ADVISORS/AdvisorsIndex.shtml

This presentation will be uploaded to:http://www.ngs.noaa.gov/web/science_edu/presentations_archive/

FAQs on the various webpages

A Question to Consider:

What is good enough with respect to the NSRS,

i.e. have we reached a level of precision and accuracy where further realizations (adjustments) are

unnecessary?

How to Plan for the Future

• Move to a contemporary realization of NAD 83• Obtain precise ellipsoid heights on NAVD 88

bench marks (OPUS -DB)– Improves hybrid geoid models and provides “hard points” in new

vertical datum

• Move off of NGVD 29 to NAVD 88– Understand the accuracy of VERTCON in your area

• Move away from passive marks to GNSS– Especially move off of classical passive control

• Require/provide complete metadata for all survey/mapping contracts

– How did they get the positions/heights?– Survey Manual/Spatial Data Accuracy and Georeferencing Standards

Next Steps/Priorities

• CBL• OPUS-DB (Begin implementing)• Heights -Study

CO State Geodetic Advisor

New Office as of Jan 22, 2013Denver Federal Center Bldg 810 Room 5014

(Colorado Federal Executive Board)303-202-4580

Cell 240-988-6363Pamela.fromhertz@noaa.gov

Geodesy.ngs.noaa.gov

http://www.ngs.noaa.gov/ADVISORS/AdvisorsIndex.shtml