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

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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 - PowerPoint PPT Presentation

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<ul><li><p>Office of Public Works (OPW) are the state agency in Ireland tasked with managementof 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)</p><p>Geological Survey Ireland (GSi) are the state agency in Ireland tasked with mapping of onshore/offshore geological mapping (50 -80 staff)Irish mapping agencies</p></li><li><p>Phase 2 Coastal DTMsInclusion of high resolution coastal DTMs </p><p>The coastal DTM will extend up to at least Highest Astronomical Tide -to 12nm offshoreE.g. Bantry Dunmanus</p></li><li><p>Bantry &amp; Dunmanus Bay Co Cork (2006)</p></li><li><p>Water column penetrating Marine LIDARVessel bathymetry</p></li><li><p>Drawbacks of Marine LIDAR usage:</p><p>- 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</p></li><li><p>Water column penetrating Marine LIDAR Surveys in Ireland2002 - Clew Bay Initial trial for the Geological Survey of Ireland (GSI)</p><p>2003 - Clew Bay - Completion of the Clew Bay Survey for GSI2003 - Survey of part of Killala Bay for GSI / Moy Valley Company2005 - Mulroy Bay survey for GSI / County Donegal.2006 Bantry Bay, Dunmanus Bay, South Galway Bay</p></li><li><p> Satellite bathymetry</p></li><li><p>Satellite mapping!PROTEUS Ltd</p><p>WorldView-2 Satellite</p><p>Map of Wexford Harbour derived from satellite Imagery. 0-10m</p><p>Useful overview but not accurate enough (2m x 2m) for shipping safety2012 test area in Wexford</p></li><li><p>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</p></li><li><p>Proposed Irish baysfor satellite data acquisitionVessel acquisition versus Satellite acquisition in the Shannon Estuary2013 campaign of 5 bays acquisition</p></li><li><p>LIDARLIDAROffice of Public Works (OPW) Topographic coastal LIDAR Surveys in IrelandThe best topographic coastal LIDAR flying dates are on the days of spring tide. </p><p>The OPW LIDAR data flown in the coastal regions of Ireland are seeking coverage out to mid tide only.</p><p>There are flown with the expressed end usage of managing coastal defences </p></li><li><p>Office of Public Works (OPW) Topographic coastal LIDAR Surveys in IrelandOPW Coastal Topo Lidar coverage</p></li><li><p>TopographicLIDARpotential forcoastal Ireland</p></li><li><p>Topographic onshore LIDAR Surveys in Ireland flown by OSiAll Osi Topo Lidar flown to High Water Mark (HWM)</p></li><li><p>The best terrestrial LIDAR flying dates are on the days of spring tide. </p><p>Terrestrial LIDAR has no water penetration capability. </p><p>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. </p><p>There are usually 2 spring tides in a calendar month. </p><p>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.</p><p>Topographic coastal LIDAR Surveys in Ireland flown by OSi</p></li><li><p>GSI Vessel bathymetry mapping!</p></li><li><p>Dublin Bay survey approach</p></li><li><p>Vessel costs:</p><p>Medium water vessels 14,000 per day</p><p>Medium to shallow vessels 7000 per day</p><p>Shallow water vessels 3000 per dayMarine LIDAR costs:</p><p>Survey mobilisation 250k</p><p>Per bay cost --- complex 500k least complex 100kSatellite costs:</p><p>Survey mobilisation 50% of contract price</p><p>Per bay cost --- complex 50k least complex 20kTopographic LIDAR costs:</p><p>Survey mobilisation 25k - 50k</p><p>Per bay cost --- complex 100k least complex 20k</p><p>***</p></li></ul>