VORF: Vertical Offshore Reference Frame

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Presentation transcript:

VORF: Vertical Offshore Reference Frame Jonathan Iliffe Civil, Environmental & Geomatic Engineering University College London Maritime SDI Open Forum. 3 March 2015

Outline Datums are an essential component of any SDI. Several initiatives around the world, including VDatum, BLAST, VORF. UKHO-sponsored VORF project ran from 2005. Reflection on key points from 10 years of work.

Land and marine height datums

Gridded datum surfaces H=0 H=0 D=0 h=0 ETRF89

Unification of datums

Consistency of datums Antenna offset ha Tide Chart Datum D hCD Tide = ha – antenna – hCD Ellipsoid Consistency of datums – survey once, use many

Integration of datums – UK & Ireland Heights with respect to ETRF89 datum across UK and Irish waters Heights of all land datums in the British Isles, within the coastal zone – 17 of them. Heights of Chart Datum, LAT, MLWS, MSL, MHWS, HAT.

Coastal modelling OD Belfast Poolbeg Datum & OD Malin Marine datums (CD etc) Poolbeg Datum & OD Malin

Methodology Satellite altimetry Tide gauge data Tidal modelling GNSS observations Plus gravimetric geoid, OSGM02 datum correction model, UKHO meta-data, coastline polygons, river polygons, etc.

Error modelling and accuracy testing Formal error modelling. External accuracy tests and internal checks. Almost all areas within the 10 cm inshore and 15 cm offshore (1s) targets. Some areas identified that will benefit from improved tidal modelling (eg off Portland Bill).

VORF Global Worldwide, outside 12 nm from the coast.

Tidal modelling – a decade of improvements Available for VORF Available for VORF Global Coast 12 nm

VORF Coastal Approach Tool V-CAT (VORF Coastal Approach Tool) allows computations inside 12 nm where coastal data is made available.

VORF Coastal Approach Tool Edit database of tide gauge data. Add acquired data, assess regions impacted. Compute enhanced surfaces.

VORF Coastal Approach Tool Tide gauge Geo-located TG

Conclusions Vertical datums are a key element of a marine SDI. Can be modelled, with different challenges in the coastal and offshore zones. Errors can be quantified spatially. VORF profited from data richness, but improved altimetry in coastal areas will impact global application.

Some references Iliffe, J. C., Ziebart, M. K. and Turner, J. F. (2007) 'A New Methodology for Incorporating Tide Gauge Data in Sea Surface Topography Models', Marine Geodesy, 30:4, 271 – 296 Iliffe, J. C., M.K. Ziebart, J.F. Turner, A.J. Talbot and A.P. Lessnoff. 2013. Accuracy of vertical datum surfaces in coastal and offshore zones. Survey Review, Volume 45, Number 331, pp. 254-262(9). Turner J.F., J.C. Iliffe, M.K. Ziebart, and C. Jones. 2013. Global Ocean Tide Models: Assessment and Use within a Surface Model of Lowest Astronomical Tide. Marine Geodesy, Volume 36, Issue 2. Turner J.F., J.C. Iliffe, M.K. Ziebart, C. Wilson and K.J. Horsburgh. 2010. Interpolation of Tidal Levels in the Coastal Zone for the Creation of a Hydrographic Datum. Journal of Atmospheric and Oceanic Technology, 27(3), pp. 605-613.