The National Positioning Infrastructure (NPI) of Singapore

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1 The National Positioning Infrastructure (NPI) of Singapore Presenter: Tan Hua Seng Jimmy (MSc Applied GIS)

2 Geodetic Infrastructure Chief Surveyor is responsible to manage and maintain the national coordinate system; and the geodetic infrastructure Objective of Geodetic Infrastructure part of cadastral survey to define cadastral boundaries (property boundaries) legally and unambiguously Used in GIS and geospatial activities to ensure homogenous and interoperable data. Geodetic Infrastructure supports cadastral survey mapping activities civil engineering / construction Other GIS and geospatial activities (navigation, tracking etc.)

3 Northing (N) National Coordinate System SVY21 (28000, 36000) Origin (0,0) Easting (E)

4 Realizations of SVY21 i) Passive Horizontal Control Point markers of the Integrated Survey Network (ISN)

5 Integrated Survey Network - Primary

6 Integrated Survey Network - Secondary

7 Fundamental Bench Mark

8 Precise Levelling Benchmark Network

9 Using GNSS for heights measurement - Geoid Model (SGeoid09)

10 Realizations of SVY21 ii) Active CORS network known as the Singapore Satellite Positioning Reference Network (SiReNT)

11 Singapore Satellite Positioning Reference Network (SiReNT) SiReNT is Singapore s National Differential GNSS infrastructure; Provides fast, reliable and high accuracy positioning, navigation and tracking (PNT); SiReNT started operations in 2006; Upgraded in July 2015 for GNSS support; Ensures PNT data that is homogeneous and interoperable; & It is the infrastructure supporting Singapore s Smart Nation initiative.

12 SiReNT GNSS Reference Stations From GNSS (GPS/GLONASS/QZSS/COMPASS & GALILEO) reference stations 1 Integrity monitoring reference 2015

13 SiReNT GNSS Reference 2015

14 SiReNT GNSS Reference Stations 8 GNSS CORS SSTS Sultan Shoal SNYU NTU SNUS - NUS SSMK-Semakau SRPT Republic Poly SNSC-National Sailing Center SNPT Nanyang Poly SLYG

15 SiReNT - GNSS Reference Station Compact and efficient setup. Charger Router Temperature Monitor Fan Terminal Server Power Cable Previous generation GPS reference station Antenna Cable New generation GNSS reference Fan Outlet station Battery Choke Ring 2015

16 SiReNT Data Data dissemination via IP broadcast Real-time SiReNT services is available with internet connection and NTRIP protocol. Non real-time services are available via the internet. Availability 24hrs per day, 7 days per week. (except stations on 4G 2015

17 SiReNT - GNSS Reference Station 2015

18 SiReNT - Services SiReNT services used in 3 main categories: Surveying & Mapping Navigation & Tracking Monitoring 2015

19 Surveying & Mapping Control / Geodetic Survey Engineering Survey Machine Control Aerial Photography GIS data collection / 2015

20 Navigation & Tracking Land Transportation Public transport Driverless Vehicles Asset Tracking Aircraft Landing Vehicle 2015

21 Monitoring (Continuous) Structural Monitoring Geotechnical Monitoring Ionospheric Study Integrated Water Vapour Tectonic Plate 2015

22 Summary SiReNT is Singapore s National Positioning Infrastructure supporting a wide range of positioning applications; SiReNT enables the realisation of Singapore s reference frame SVY21; SiReNT DGNSS provides sub-metre & centimetres positioning accuracy in realtime; SiReNT data can be used for atmospheric modelling and 2015

23 Thank you 谢谢 Terima kasih நன

24 Geodetic Infrastructure Localised datums can give a more accurate representation of the area of coverage than the global WGS 84 datum; SVY21, for example, is a better approximation to the Geoid covering Singapore than the global WGS 84 ellipsoid; &

25 Singapore Height Datum LAND FORESHORES SEABED PLBM earth surface X.XXX m High Water Mark (HWM) Singapore Height Datum = 0.000m m Victoria Dock, Tide Gauge m (8 3 ) m Low Water Mark (LWM) 0.889m m Admiralty Chart Datum False Datum (used by PWD)

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