1

Positioning NYSNet with

The National Spatial Reference System (NSRS)

January 2017

2Positioning NYSNet

1) National Spatial Reference System (NSRS) 5 MinutesNGS CORSNGS Guidelines for RTN’s

2) Positioning 5 Minutes

3) Monitoring 10 MinutesRT Positioning Non NGS CORS PP Positioning Non NGS CORS Single BaseMonitoring NYSNet Daily Network adjustmentMonitoring NYSNet Weekly NGS OPUS

4) OPUS Projects 10 MinutesOPUS P Draft documentation RTN PositioningPositioning NYSNet with OPUS ProjectsPosition Monitoring Results

5) GNSS 30 MinutesNAVD88 HeightsNetwork RTK (NRTK)GNSS status

5) Access 30 MinutesNetwork StatusRover StatusUser AccountsNotices

6) Questions

3National Spatial Reference System (NSRS)

4NGS CORS

5NYSNet Tied to NSRS

6NGS Guidelines for RTN’s

7NGS Guidelines for RTN’s

8Positioning Non NGS CORS

Originally (2007-2012)10, 24 hr OPUS solutions NAD83 (CORS96) EPOCH 2002

Future – OPUS Projects

Currently (2012 –Present) – 10, 24 hr, 30 second observations in a least squares adjustment.NAD83 (2011) EPOCH 2010

9Monitoring Non NGS CORS-RT Single Base

10Monitoring Non NGS CORS - PP

11Monitoring NYSNet-Weekly NGS OPUS

12Monitoring NYSNet-Daily Network adjustment

13Monitoring NYSNet-Daily Network adjustment – seasonal change

January 2016

14Monitoring NYSNet-Daily Network adjustment – roofing contractors

January 2016

15OPUS P Draft Documentation – RTN Positioning

16OPUS P Draft Documentation – RTN Positioning

17Monitoring NYSNet-Monthly OPUS Projects

18OPUS P Upload Observations

19OPUS P Check OPUS Statistics

20OPUS P Upload 5 sessions

21OPUS P Processing Parameters

22OPUS P Minimally Constrained Adjustment

23OPUS P Fully Constrained Adjustment

24Monitoring NYSNet-Monthly OPUS Projects

25Positioning NYSNet - position

26Positioning NYSNet - height

27Monitoring Non NGS CORS

Site_ID Month Lat_Deg Lat_Min Lat_Sec SPC_North(m) Lon_Deg Lon_Min Lon_Sec SPC_East(m) Ellipsoid_Hgt Lat_Delta(cm) Lon_Delta(cm) Hgt_Delta(cm)

NYAB PUB 42 42 48.87321 431082.978 73 48 58.50162 206006.378 90.067

NYAB AVG 42 42 48.87314 431082.976 73 48 58.50143 206006.382 90.071 -0.233 0.433 0.400

NYBK PUB 40 42 12.32084 59604.656 73 58 44.25877 301778.047 -15.219

NYBK AVG 40 42 12.32086 59604.657 73 58 44.25925 301778.036 -15.224 0.067 -1.133 -0.500

NYHF PUB 43 19 3.62761 498381.889 73 34 7.36929 225538.250 64.573

NYHF AVG 43 19 3.62763 498381.889 73 34 7.36937 225538.249 64.584 0.033 -0.133 1.100

NYHM PUB 43 1 6.29900 464836.985 74 59 45.08351 109583.462 95.282

NYHM AVG 43 1 6.29905 464836.987 74 59 45.08379 109583.456 95.283 0.167 -0.567 0.100

NYJM PUB 40 39 46.05512 55110.609 73 48 25.48850 316313.779 -12.589

NYJM AVG 40 39 46.05517 55110.611 73 48 25.48868 316313.774 -12.595 0.167 -0.467 -0.567

NYMO PUB 41 38 45.60379 312298.089 74 39 44.18092 136482.695 400.175

NYMO AVG 41 38 45.60380 312298.090 74 39 44.18087 136482.696 400.165 0.067 0.067 -1.000

NYNS PUB 43 7 7.74858 346463.991 76 8 29.77296 285947.365 98.589

NYNS AVG 43 7 7.74852 346463.989 76 8 29.77281 285947.368 98.584 -0.167 0.300 -0.500

NYOB PUB 40 33 5.55497 42745.258 74 6 59.66710 290125.753 -11.917

NYOB AVG 40 33 5.55496 42745.258 74 6 59.66697 290125.756 -11.931 -0.033 0.300 -1.400

NYPR PUB 40 38 16.23989 52329.684 74 7 29.30179 289442.140 -15.718

NYPR AVG 40 38 16.24004 52329.689 74 7 29.30179 289442.140 -15.726 0.500 0.033 -0.833

NYWS PUB 42 42 3.12644 300043.014 78 7 33.89521 387462.764 314.439

NYWS AVG 42 42 3.12640 300043.013 78 7 33.89509 387462.767 314.431 -0.067 0.267 -0.767

-1.133

-1.000

-1.400

28Posting Monthly Opus Project result comparison to published

29Posting Monthly Opus Project result comparison to published

30Posting Monthly Opus Project result comparison to published

31Considering Updating Non NGS CORS positions to average of 3 monthly Opus Projects

32

Ellipsoid

GEOID-29.25

513.123

GPS Vector

HI

H=h-NOrtho Ht = Ellipsoid Ht – GEOID HtOrtho Ht = 513.123 – (-29.25)Ortho Ht = 513.123 +29.25Ortho Ht = 542.373 [GPS/GEOID 12a]Leveled Ht = 542.347Difference = 2.8 cm’s

•NAVD88 From CORS Using GEOID12a

Difference = 2.8 cm’s

542.373 GEOID12a

542.347Leveled

33

April 2015 NGS HTMOD Partner Mtg 33

GEOID12b - NGSIDB

34GEOID12b - NGSIDB

2001 FBN Survey included BM’sLeveled to Most HARNLeveled to Most CORS antennas

35GPS BM OPUS DB

542.375 – 542.347 = .028 m

36Network RTK(NRTK)

36

Atmosphere

Reference Station

Rover

10k >10k

1cm +1ppm

Rover

37GNSS Status

38User Accounts

39Notices

40User Profile

41Site Status

42Site Status

43Rover Status

44RTN Status

45NOVA Maps

46Thank you for the help

Leigh Meyer – NYSDOT Transportation AnalystPatrick Magee – NYSDOT Land SurveyorDan Martin – NGS Northeast Geodetic AdvisorClaude St Pierre– Leica GeosystemsHenri Ayers – Retired, Leica GeosystemsNGS OPUS TeamNGS CORS TeamMany others since 2006

stephen.roden@dot.ny.gov (518) 485-1385

47Learning Assesment

2016 NYSNet PositioningAssessment of Learning Questions: 1.) Most of the NYSNet reference stations are currently positioned by?

a. NYS Association of Professional Land Surveyors b. National Geodetic Survey c. National Geographic d. United States Geographic Survey

2.) Surveys can be referenced to the NSRS by connecting to a. State Plane Coordinate System b. GLONASS c. Gallileod. CORS

3.) What method does NGS prefer for determining positional coordinates of RTN reference stations :

a. OPUSb. Network Adjustmentc. Triangulationd. Traversing

4.) CORS constrained in a least squares adjustment should be CORS that a. have good time series plotsb. have computed velocitiesc. have existed more than 2.5 yearsd. all of the above

5.) OPUS is what type of positioning a. Average of single base positioning b. GPS/GLONASS positioning c. Network RTK positioning d. Network Adjustment Positioning