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TitleHydrographic vertical separation surfaces (HyVSEPs) for the tidal waters of Canada
AuthorRobin, C; Nudds, S; MacAulay, P; Godin, A; De Lange Boom, B; Bartlett, J
SourceMarine Geodesy vol. 39, no. 2, 2016 p. 195-222,
Alt SeriesEarth Sciences Sector, Contribution Series 20150485
PublisherTaylor & Francis
Mediapaper; on-line; digital
File formatpdf
ProvinceCanada; Offshore region
Subjectsgeophysics; marine geology; geodesy; satellite geodesy; hydrography; bathymetry; tides; modelling; models; oceanography; shorelines; water levels; Hydrographic Vertical Separations Surfaces (HyVSEPs); chart datum; geodetic ellipsoid; relative sea-level rise; satellite altimetry; geoid models; dynamic ocean models (DOMs); global positioning system (GPS); tide stations; Global Navigation Satellite Systems (GNSS); dynamic ocean topography (DOT)
Illustrationslocation maps; flow diagrams; sketch maps; histograms; models; tables; sections
ProgramCanadian Spatial Reference System, Geodetic Survey
AbstractSince the advent of Global Navigation Satellite Systems, it has been possible to perform hydrographic survey reductions through the ellipsoid, which has the potential to simplify operations and improve bathymetric products. This technique requires a spatially continuous separation surface connecting chart datum (CD) to a geodetic ellipsoid. The Canadian Hydrographic Service (CHS), with support from the Canadian Geodetic Survey, has developed a new suite of such surfaces, termed Hydrographic Vertical Separations Surfaces, or HyVSEPs, for CD and seven tidal levels. They capture the spatial variability of the tidal datum and levels between tide gauges and offshore using semiempirical models coupling observations at tide stations with relative sea-level rise estimates, dynamic ocean model solutions, satellite altimetry, and a geoid model. HyVSEPs are available for all tidal waters of Canada, covering over seven million square kilometers of ocean and more than 200,000 kilometers of shoreline. This document provides an overview of the CHS's modeling approach, tools, methods, and procedures.
The HyVSEP for CD defines the new hydrographic datum for the tidal waters of Canada. HyVSEPs for other tidal levels are fundamental for coastal studies, climate change adaptation and the definition of the Canadian shoreline and offshore boundaries. HyVSEPs for inland waters are not discussed.
Summary(Plain Language Summary, not published)
NRCan is responsible for the Canadian Spatial Reference System, a national standard that enables high accuracy positioning and geodetic measurements of the dynamic Earth, including the height reference system, enabling determination of heights above sea-level. This system forms the basis of a new marine geodetic height system managed by Fisheries and Oceans Canada, created as part of the Continuous Vertical Datum for Canadian Waters (CVDCW) project, co-led by NRCan and DFO since 2011. The CVDCW brings a new paradigm for hydrography and marine geodesy in Canada. The introduction of Hydrographic Vertical Separation Surfaces (HyVSEPs) moves away from a tide-gauge based marine height reference to a model-based one, which incorporates data from tide gauges, ocean models, geoid models, and satellite and GPS observations. It will align DFO systems (nautical charts and electronic navigation) with the national system defined by NRCan, linking land- and sea-based measurements.