New England Height Issues NGS HeightMod Forum Nashua

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New England Height Issues NGS Height-Mod Forum Nashua, NH December 10, 2009 Dan Martin

New England Height Issues NGS Height-Mod Forum Nashua, NH December 10, 2009 Dan Martin National Geodetic Survey Vermont State Advisor

What do we have in common? • All NE states are “wet” and all

What do we have in common? • All NE states are “wet” and all but one state has a salty coastline • Much of our topography is similar • Shared riverine network • Life is good

How can Height-Mod help? • Disaster preparation/mitigation – Evacuation Routes for coastal storms –

How can Height-Mod help? • Disaster preparation/mitigation – Evacuation Routes for coastal storms – Coastal storm inundation models – Stream flow models to predict riverine flooding – Flood plain mapping – Point and non-point pollution/runoff models

Hancock, VT

Hancock, VT

Alstead, NH

Alstead, NH

Flood plain mapping

Flood plain mapping

 • Construction – Dams, levees, riverine management – Roads and bridges – Building

• Construction – Dams, levees, riverine management – Roads and bridges – Building and other developments

 • Coastal conservation – Accurate ties between geodetic and tidal datums – Planning

• Coastal conservation – Accurate ties between geodetic and tidal datums – Planning ecosystem restoration projects – Shoreline restoration projects

Narragansett Bay National Estuarine Research Reserve

Narragansett Bay National Estuarine Research Reserve

 • Nautical charting and efficient shipping – Support NOAA’s “Physical Oceanographic Real. Time

• Nautical charting and efficient shipping – Support NOAA’s “Physical Oceanographic Real. Time System” (PORTS) – Supports VDATUM

PORTS

PORTS

NGSIDB BM Status (1 st, 2 nd order) CT MA ME NH RI VT

NGSIDB BM Status (1 st, 2 nd order) CT MA ME NH RI VT In NGSIDB 2599 1125 5401 1092 1380 2158 Poor 31 24 118 20 19 17 Not Found 281 150 1048 218 196 363 Not Rec since Monumented 533 254 1659 216 160 461 Last Rec ≤ 1990 1570 584 4475 689 857 374 Last Rec ≤ 1980 160 499 3434 531 277 331

NE Vertical Control

NE Vertical Control

Height-Mod means More Marks

Height-Mod means More Marks

More Marks

More Marks

More Marks

More Marks

More Marks (OPUS_DB on BM’s)

More Marks (OPUS_DB on BM’s)

Using Real-Time RT 1 RT 2 RT 3 RT 4 95%(RMSEr) (m) 95%(RMSEz) (m)

Using Real-Time RT 1 RT 2 RT 3 RT 4 95%(RMSEr) (m) 95%(RMSEz) (m) 0. 032967 0. 033251 0. 036622 0. 036143 0. 018825 0. 0237233 0. 027924 0. 026851