Overview of Penn DOT CORS VRS RTN for

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Overview of : Penn. DOT CORS & VRS / RTN for Great Lakes Region

Overview of : Penn. DOT 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 WARREN Mc. KEAN 1 CRAWFORD Oil City FOREST CAMERON VENANGO 10 ARMSTRONG BEAVER

ERIE WARREN Mc. KEAN 1 CRAWFORD Oil City FOREST CAMERON VENANGO 10 ARMSTRONG BEAVER SNYDER INDIANA 11 Indiana ALLEGHENY CAMBRIA Hollidaysburg 12 GREENE Uniontown SOMERSET FAYETTE NORTHAMPTON LEHIGH Allentown TA DAUPHIN LEBANON BERKS Harrisburg BUCKS HUNTINGDON 9 WASHINGTON 5 IA PERRY Bridgeville WESTMORELAND NORTHUMBERLAND SCHUYLKILL N JU MONROE CARBON N LI F IF M BLAIR LUZERNE MONTOUR UNION CENTRE PIKE Dunmore COLUMBIA CLEARFIELD LACKAWANNA 3 CLINTON Clearfield LAWRENCE BUTLER LYCOMING 2 JEFFERSON CLARION SULLIVAN Montoursville WAYNE 4 WYOMING ELK MERCER SUSQUEHANNA BRADFORD TIOGA POTTER BEDFORD CUMBERLAND FULTON FRANKLIN 8 LANCASTER 6 MONTGOMERY PHILADELPHIA King of Prussia ADAMS YORK CHESTER DELAWARE Our Purpose & Function: Provide Geodetic Survey Operations & Support for the Penn. DOT Photogrammetry & Surveys Section & Districts Provide Geodetic Survey Control for the Commonwealth ENGINEERING DISTRICTS Coordinate with the National Geodetic Survey (NGS)

GPS at Penn. DOT 3

GPS at Penn. DOT 3

GPS at Penn. DOT Field Equipment • Pre 1996 = Conventional Survey Techniques Wild

GPS at Penn. DOT Field Equipment • Pre 1996 = Conventional Survey Techniques Wild T 2 Theodolite Zeiss Ni 2 Automatic Level 4

GPS at Penn. DOT Field Equipment • 1996 = Penn. DOT purchased first GPS

GPS at Penn. DOT Field Equipment • 1996 = Penn. DOT purchased first GPS units for PSS • 1999 = Penn. DOT purchased GPS units for all Districts Trimble 4800 Rover 1999 Trimble 4000 SSI 1996 Trimble 4700 Base 1999 5

GPS at Penn. DOT Field Equipment • 2006 = Penn. DOT started purchase of

GPS at Penn. DOT Field Equipment • 2006 = Penn. DOT started purchase of GPS+GLONASS Trimble R 8 (GPS only) = 2003+ Trimble R 8 GNSS (GPS+GLONASS) = 2006+ 6

GPS at Penn. DOT CORS = National Coverage thru the National Geodetic Survey 7

GPS at Penn. DOT CORS = National Coverage thru the National Geodetic Survey 7

GPS at Penn. DOT CORS History First NGS CORS in PA from Penn. DOT

GPS at Penn. DOT CORS History First NGS CORS in PA from Penn. DOT WIL 1 - in 1996 – at Penn State Univ, Wilkes-Barre Campus Trimble 4000 SSI (now 4700) with Compact L 1/L 2 Antenna (still there!) Soon to be upgraded to Trimble Net. R 9 w/ Zephyr Antenna (GNSS) 8

GPS at Penn. DOT CORS History First NGS (GNSS) CORS in PA from Penn.

GPS at Penn. DOT CORS History First NGS (GNSS) CORS in PA from Penn. DOT PAAP – in 2010 – at Univ of Pittsburgh, Oakland Campus Trimble Net. R 5 w/ Zephyr Antenna (GNSS) 9

GPS at Penn. DOT CORS = PA Coverage - data access thru the NGS

GPS at Penn. DOT CORS = PA Coverage - data access thru the NGS http: //www. ngs. noaa. gov/CORS/ Currently 20 NGS CORS in PA from Penn. DOT (16 – GPS and 4 – GNSS) + 7 more NGS CORS from other state entities 10

GPS at Penn. DOT CORS = Examples – District 2 -6 - Potter County

GPS at Penn. DOT CORS = Examples – District 2 -6 - Potter County GPS Antenna GPS Receiver with Computer 11

GPS at Penn. DOT CORS = Examples – District 10 -0 HQ - Indiana

GPS at Penn. DOT CORS = Examples – District 10 -0 HQ - Indiana Co GPS Antenna GPS Receiver with Computer 12

GPS at Penn. DOT VRS = Virtual Reference System 13

GPS at Penn. DOT VRS = Virtual Reference System 13

GPS at Penn. DOT VRS = Current Penn. DOT Use Current Penn. DOT use

GPS at Penn. DOT VRS = Current Penn. DOT Use Current Penn. DOT 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) • Penn. DOT currently has own VRS in SW PA – currently submitting purchase request for state-wide expansion of the Penn. DOT VRS • Penn. DOT 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 Penn. DOT = No $$$ fees – Trimble & Topcon vendor networks & possibly Leica in the near future 14

GPS at Penn. DOT VRS = Penn. DOT Coverage – SW PA http: //www.

GPS at Penn. DOT VRS = Penn. DOT Coverage – SW PA http: //www. dotvrs. state. pa. us/ 15

GPS at Penn. DOT VRS = Vendor (Key. Net. GPS) PA Coverage http: //vrs.

GPS at Penn. DOT VRS = Vendor (Key. Net. GPS) PA Coverage http: //vrs. keynetgps. com/ 16

GPS at Penn. DOT VRS = Possible State-wide Penn. DOT Coverage http: //www. dotvrs.

GPS at Penn. DOT VRS = Possible State-wide Penn. DOT Coverage http: //www. dotvrs. state. pa. us/ 17

GPS at Penn. DOT GPS Accuracies - Summary Method Static Fast Static RTK VRS

GPS at Penn. DOT GPS Accuracies - Summary Method Static Fast Static RTK VRS Obs Time 30 - 60 min (over 6 miles) 8 - 20 min (under 6 miles) 5 sec - 3 min (in 20 mile network) Accuracy 0. 02 - 0. 05’ Horz 0. 10 - 0. 15’ Vert 0. 05 – 0. 07’ Horz 0. 10 - 0. 15’ Vert FUTURE Outlook = stronger GPS signals / more SVs = even better accuracy 18

Resources – NGS CORS • http: //www. ngs. noaa. gov/CORS/ – Download GPS data

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/2010 Summit/2010 Federal. Geospatial. Summit. Proceedings. pdf – NGS Survey Control Database • http: //www. ngs. noaa. gov/cgi-bin/datasheet. prl – Penn. DOT’s Photogrammetry Asset Management System (PAMS) • http: //www. penndotpams. org – Penn. DOT’s Surveying & Mapping Manual (Pub. 122 M) • http: //www. dot. state. pa. us/Internet/Bureaus/pd. BOS. nsf/Forms. And. Pubs. Home. Page? Open. Frame. Set 19