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Overview of : PennDOT CORS & VRS / RTN for Great Lakes Region Height Modernization Consortium Charles I. Harpster, Jr., PowerPoint Presentation
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Overview of : PennDOT CORS & VRS / RTN for Great Lakes Region Height Modernization Consortium Charles I. Harpster, Jr., CP, LSIT ( charpster@state.pa.us ) Geodetic Surveys Manager. April 13, 2011. ERIE. SUSQUEHANNA. WARREN. McKEAN. 1. BRADFORD. TIOGA. POTTER. CRAWFORD . WAYNE. 4.

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Presentation Transcript
slide1

Overview of :

  • PennDOT CORS & VRS / RTN
    • for
    • Great Lakes Region Height Modernization Consortium
  • Charles I. Harpster, Jr., CP, LSIT
  • (charpster@state.pa.us)
  • Geodetic Surveys Manager

April 13, 2011

slide2

ERIE

SUSQUEHANNA

WARREN

McKEAN

1

BRADFORD

TIOGA

POTTER

CRAWFORD

WAYNE

4

Oil City

FOREST

WYOMING

ELK

SULLIVAN

LACKAWANNA

CAMERON

LYCOMING

2

VENANGO

PIKE

Dunmore

3

Dunmore

Montoursville

MERCER

CLINTON

JEFFERSON

CLARION

LUZERNE

Clearfield

COLUMBIA

MONROE

LAWRENCE

MONTOUR

10

UNION

CLEARFIELD

BUTLER

CENTRE

CARBON

5

NORTHUMBER-

LAND

ARMSTRONG

SNYDER

NORTHAMPTON

BEAVER

INDIANA

LEHIGH

11

SCHUYLKILL

MIFFLIN

Allentown

BLAIR

JUNIATA

Indiana

ALLEGHENY

CAMBRIA

Hollidaysburg

BERKS

DAUPHIN

LEBANON

PERRY

Bridgeville

Bridgeville

Harrisburg

BUCKS

WESTMORELAND

HUNTINGDON

MONTGOMERY

9

6

WASHINGTON

CUMBERLAND

12

8

Uniontown

LANCASTER

PHILADELPHIA

SOMERSET

King of Prussia

BEDFORD

FULTON

FRANKLIN

DELAWARE

CHESTER

FAYETTE

YORK

GREENE

ADAMS

  • Our Purpose & Function:
  • Provide Geodetic Survey Operations & Support for the PennDOT Photogrammetry & Surveys Section & Districts
  • Provide Geodetic Survey Control for the Commonwealth
  • Coordinate with the National Geodetic Survey (NGS)

ENGINEERING DISTRICTS

gps at penndot field equipment
GPS at PennDOTField Equipment
  • Pre 1996 = Conventional Survey Techniques

Wild T2 Theodolite

Zeiss Ni2 Automatic Level

gps at penndot field equipment5
GPS at PennDOTField Equipment
  • 1996 = PennDOT purchased first GPS units for PSS
  • 1999 = PennDOT purchased GPS units for all Districts

Trimble 4800 Rover

1999

Trimble 4000 SSI

1996

Trimble 4700 Base

1999

gps at penndot field equipment6
GPS at PennDOTField Equipment
  • 2006 = PennDOT started purchase of GPS+GLONASS

Trimble R8 (GPS only) = 2003+

Trimble R8 GNSS (GPS+GLONASS) = 2006+

gps at penndot penndot cors history
GPS at PennDOTPennDOT CORS History

First NGS CORS in PA from PennDOT

WIL1 - in 1996 – at Penn State Univ, Wilkes-Barre Campus

Trimble 4000SSI (now 4700) with Compact L1/L2 Antenna (still there!)

Soon to be upgraded to Trimble NetR9 w/ Zephyr Antenna (GNSS)

gps at penndot penndot cors history9
GPS at PennDOT PennDOT CORS History

First NGS (GNSS) CORS in PA from PennDOT

PAAP – in 2010 – at Univ of Pittsburgh, Oakland Campus

Trimble NetR5 w/ Zephyr Antenna (GNSS)

gps at penndot cors pa coverage data access thru the ngs http www ngs noaa gov cors
GPS at PennDOTCORS = PA Coverage - data access thru the NGS http://www.ngs.noaa.gov/CORS/

Currently 20 NGS CORS in PA from PennDOT

(16 – GPS and 4 – GNSS)

+ 7 more NGS CORS from other state entities

gps at penndot cors examples district 2 6 potter county
GPS at PennDOTCORS = Examples – District 2-6 - Potter County

GPS Antenna

GPS Receiver with Computer

gps at penndot cors examples district 10 0 hq indiana co
GPS at PennDOTCORS = Examples – District 10-0 HQ - Indiana Co

GPS Antenna

GPS Receiver with Computer

gps at penndot vrs current penndot use
GPS at PennDOT VRS = Current PennDOT Use

Current PennDOT use of VRS:

  • Increases field production by 30-50% from traditional GPS surveying
      • Reduce GPS field observation times by cellular phone link
        • Cut GPS field occupation time from 8-15 minutes to 3 minutes.
      • Reduce GPS office computation times by using real-time GPS methods
        • Coordinate values available in field, eliminates majority of GPS processing in office
      • More active field GPS units (rovers), eliminates static field GPS units (bases)
      • Significantly reduce need for “passive monumentation”
      • Anxiously awaiting newer / better NGS geoid models (NGS - 10 yr plan)
  • PennDOT currently has own VRS in SW PA
    • currently submitting purchase request for state-wide expansion of the PennDOT VRS
  • PennDOT PSS currently streams real-time data from 21 CORS to 3 Vendor RTN’s
    • 1 base station data stream to vendor = 1 field rover vendor account for PennDOT = No $$$ fees
    • Trimble & Topcon vendor networks & possibly Leica in the near future
gps at penndot gps accuracies summary
GPS at PennDOT GPS Accuracies - Summary

Method Obs Time Accuracy

Static 30 - 60 min 0.02 - 0.05’ Horz

(over 6 miles) 0.10 - 0.15’ Vert

Fast Static 8 - 20 min 0.02 - 0.05’ Horz

(under 6 miles) 0.10 - 0.15’ Vert

RTK 5 sec - 3 min 0.05 – 0.07’ Horz

(under 6 miles) 0.10 - 0.15’ Vert

VRS 5 sec - 3 min 0.05 – 0.07’ Horz

(in 20 mile network) 0.10 - 0.15’ Vert

FUTURE Outlook = stronger GPS signals / more SVs = even better accuracy

resources
Resources
  • NGS CORS
    • http://www.ngs.noaa.gov/CORS/
      • Download GPS data to process against your GPS data (i.e. in TGO Software)
        • eliminates need for a field base receiver and frees up receiver for more roving production
  • NGS OPUS (Online Positioning Users Service)
    • http://www.ngs.noaa.gov/OPUS/
      • Submit your GPS data to NGS and have them process it for you, for free!
      • Great for GPS positioning of single points, but points are not “networked or connected” together
      • OPUS-S (static) = at least 2 hrs of GPS data processed against 3 surrounding CORS
      • OPUS-RS (rapid-static) = 15 min to 4 hrs of GPS data processed against all surrounding CORS
      • Results emailed to you within seconds / minutes!
      • OPUS-DB = publish your results into NGS’s database
  • NGS Federal Geospatial Summit 2010 http://www.ngs.noaa.gov/2010Summit/2010FederalGeospatialSummitProceedings.pdf
  • NGS Survey Control Database
    • http://www.ngs.noaa.gov/cgi-bin/datasheet.prl
  • PennDOT’s Photogrammetry Asset Management System (PAMS)
    • http://www.penndotpams.org
  • PennDOT’s Surveying & Mapping Manual (Pub. 122M)
    • http://www.dot.state.pa.us/Internet/Bureaus/pdBOS.nsf/FormsAndPubsHomePage?OpenFrameSet