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Office of Public Works (OPW) are the state agency in Ireland tasked with management

Irish mapping agencies. Office of Public Works (OPW) are the state agency in Ireland tasked with management of physical Irish coast line and coastal defences (20 -30 staff). Ordnance Survey Ireland (OSi) are the semi-state agency in Ireland tasked with

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Office of Public Works (OPW) are the state agency in Ireland tasked with management

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  1. Irish mapping agencies Office of Public Works (OPW) are the state agency in Ireland tasked with management of physical Irish coast line and coastal defences (20 -30 staff) Ordnance Survey Ireland (OSi) are the semi-state agency in Ireland tasked with management of onshore topographic mapping (140 -170 staff) Geological Survey Ireland (GSi) are the state agency in Ireland tasked with mapping of onshore/offshore geological mapping (50 -80 staff)

  2. Phase 2 – Coastal DTM’s • Inclusion of high resolution coastal DTM’s • The coastal DTM will extend up to at least Highest Astronomical Tide -to 12nm offshore • E.g. Bantry Dunmanus

  3. Bantry & Dunmanus BayCo Cork (2006)

  4. Vessel bathymetry Water column penetrating Marine LIDAR

  5. SHALLOW WATER VERY TURBID WATER Drawbacks of Marine LIDAR usage:- Turbidity (clarity of water)- Contact resolution (1m x 1m dot density ideal)- Cost (generally a factor of 5 increase as against onshore LIDAR)- Increased post-processing capacity required

  6. Water column penetrating Marine LIDAR Surveys in Ireland 2003 - Survey of part of Killala Bay for GSI / Moy Valley Company 2005 - Mulroy Bay survey for GSI / County Donegal. 2002 - Clew Bay – Initial trial for the Geological Survey of Ireland (GSI) 2008 - BLOM survey for GSI of Donegal/Sligo/ Gretamans Bays TENIX survey of Tralee/Blacksod/ Foyle Bays 2003 - Clew Bay - Completion of the Clew Bay Survey for GSI 2010 - Pelydryn survey for GSI of Inner Mulroy/ Killala/Sligo/ Lough Swilly/Galway Bays 2006 – Bantry Bay, Dunmanus Bay, South Galway Bay

  7. Satellite bathymetry

  8. Satellite mapping! 2012 test area in Wexford PROTEUS Ltd WorldView-2 Satellite Map of Wexford Harbour derived from satellite Imagery. 0-10m Useful overview but not accurate enough (2m x 2m)for shipping safety

  9. Drawbacks of Satellite usage:- Turbidity (clarity of water) - Cloud (needs clear skies)- Contact resolution (2m x 2m dot density ideal)- Cost (generally a factor of 2 -3 increase on equivalent ship cost)- Increased post-processing capacity required

  10. Vessel acquisition versus Satellite acquisition in the Shannon Estuary 2013 campaign of 5 bays acquisition Proposed Irish bays for satellite data acquisition

  11. Office of Public Works (OPW) Topographic coastal LIDAR Surveys in Ireland • The best topographic coastal LIDAR flying dates are on the days of spring tide. • The OPW LIDAR data flown in the coastal regions of Ireland are seeking coverage out to mid tide only. • There are flown with the expressed end usage of managing coastal defences LIDAR LIDAR

  12. Office of Public Works (OPW) Topographic coastal LIDAR Surveys in Ireland OPW Coastal Topo Lidar coverage

  13. Topographic LIDAR potential for coastal Ireland

  14. Topographic onshore LIDAR Surveys in Ireland flown by OSi All Osi Topo Lidar flown to High Water Mark (HWM)

  15. Topographic coastal LIDAR Surveys in Ireland flown by OSi • The best terrestrial LIDAR flying dates are on the days of spring tide. • Terrestrial LIDAR has no water penetration capability. • The spring tide day usually occurs a day or two after both the full moon and then the new moon days of any calendar month. • There are usually 2 spring tides in a calendar month. • Flying to capture the low tide mark is only optimum for one (1) hour either side of the low water time on those spring tide days.

  16. GSI Vessel bathymetry mapping!

  17. Dublin Bay survey approach

  18. Vessel costs: Medium water vessels €14,000 per day Medium to shallow vessels €7000 per day Shallow water vessels €3000 per day Marine LIDAR costs: Survey mobilisation €250k Per bay cost --- complex €500k least complex €100k Topographic LIDAR costs: Survey mobilisation €25k - €50k Per bay cost --- complex €100k least complex €20k Satellite costs: Survey mobilisation 50% of contract price Per bay cost --- complex €50k least complex €20k

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